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StreamGear API Usage Examples: Real-time Frames Mode⚓

Real-time Frames Mode is NOT Live-Streaming.

Rather you can easily enable live-streaming in Real-time Frames Mode by using StreamGear API's exclusive -livestream attribute of stream_params dictionary parameter. Checkout following usage example.

Important Information

  • StreamGear MUST requires FFmpeg executables for its core operations. Follow these dedicated Platform specific Installation Instructions ➶ for its installation.

  • StreamGear API will throw RuntimeError, if it fails to detect valid FFmpeg executables on your system.

  • By default, StreamGear generates a primary stream of same resolution and framerate1 as the input video (at the index 0).

  • Always use terminate() function at the very end of the main code.

After going through following Usage Examples, Checkout more of its advanced configurations here ➶

Bare-Minimum Usage⚓

Following is the bare-minimum code you need to get started with StreamGear API in Real-time Frames Mode:

We are using CamGear in this Bare-Minimum example, but any VideoCapture Gear will work in the similar manner.

# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(for e.g `foo1.mp4` file)
stream = CamGear(source='foo1.mp4').start() 

# describe a suitable manifest-file location/name
streamer = StreamGear(output="dash_out.mpd")

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(for e.g `foo1.mp4` file)
stream = CamGear(source='foo1.mp4').start() 

# describe a suitable manifest-file location/name
streamer = StreamGear(output="hls_out.m3u8", format = "hls")

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()

After running this bare-minimum example, StreamGear will produce a Manifest file (dash.mpd) with streamable chunks that contains information about a Primary Stream of same resolution and framerate1 as input (without any audio).

Bare-Minimum Usage with Live-Streaming⚓

You can easily activate Low-latency Livestreaming in Real-time Frames Mode, where chunks will contain information for few new frames only and forgets all previous ones), using exclusive -livestream attribute of stream_params dictionary parameter as follows:

Use -window_size & -extra_window_size FFmpeg parameters for controlling number of frames to be kept in Chunks. Less these value, less will be latency.

After every few chunks (equal to the sum of -window_size & -extra_window_size values), all chunks will be overwritten in Live-Streaming. Thereby, since newer chunks in manifest/playlist will contain NO information of any older ones, and therefore resultant DASH/HLS stream will play only the most recent frames.

In this mode, StreamGear DOES NOT automatically maps video-source audio to generated streams. You need to manually assign separate audio-source through -audio attribute of stream_params dictionary parameter.

# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(from web-camera attached at index `0`)
stream = CamGear(source=0).start()

# enable livestreaming and retrieve framerate from CamGear Stream and
# pass it as `-input_framerate` parameter for controlled framerate
stream_params = {"-input_framerate": stream.framerate, "-livestream": True}

# describe a suitable manifest-file location/name
streamer = StreamGear(output="dash_out.mpd", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break

    # {do something with the frame here}

    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(from web-camera attached at index `0`)
stream = CamGear(source=0).start()

# enable livestreaming and retrieve framerate from CamGear Stream and
# pass it as `-input_framerate` parameter for controlled framerate
stream_params = {"-input_framerate": stream.framerate, "-livestream": True}

# describe a suitable manifest-file location/name
streamer = StreamGear(output="hls_out.m3u8", format = "hls", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break

    # {do something with the frame here}

    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()

Bare-Minimum Usage with RGB Mode⚓

In Real-time Frames Mode, StreamGear API provide rgb_mode boolean parameter with its stream() function, which if enabled (i.e. rgb_mode=True), specifies that incoming frames are of RGB format (instead of default BGR format), thereby also known as RGB Mode.

The complete usage example is as follows:

# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(for e.g `foo1.mp4` file)
stream = CamGear(source='foo1.mp4').start() 

# describe a suitable manifest-file location/name
streamer = StreamGear(output="dash_out.mpd")

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {simulating RGB frame for this example}
    frame_rgb = frame[:,:,::-1]


    # send frame to streamer
    streamer.stream(frame_rgb, rgb_mode = True) #activate RGB Mode

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(for e.g `foo1.mp4` file)
stream = CamGear(source='foo1.mp4').start() 

# describe a suitable manifest-file location/name
streamer = StreamGear(output="hls_out.m3u8", format = "hls")

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {simulating RGB frame for this example}
    frame_rgb = frame[:,:,::-1]


    # send frame to streamer
    streamer.stream(frame_rgb, rgb_mode = True) #activate RGB Mode

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()

Bare-Minimum Usage with controlled Input-framerate⚓

In Real-time Frames Mode, StreamGear API provides exclusive -input_framerate attribute for its stream_params dictionary parameter, that allow us to set the assumed constant framerate for incoming frames.

In this example, we will retrieve framerate from webcam video-stream, and set it as value for -input_framerate attribute in StreamGear:

Remember, Input framerate default to 25.0 fps if -input_framerate attribute value not defined in Real-time Frames mode.

# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# Open live video stream on webcam at first index(i.e. 0) device
stream = CamGear(source=0).start()

# retrieve framerate from CamGear Stream and pass it as `-input_framerate` value
stream_params = {"-input_framerate":stream.framerate}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="dash_out.mpd", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# Open live video stream on webcam at first index(i.e. 0) device
stream = CamGear(source=0).start()

# retrieve framerate from CamGear Stream and pass it as `-input_framerate` value
stream_params = {"-input_framerate":stream.framerate}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="hls_out.m3u8", format = "hls", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()

Bare-Minimum Usage with OpenCV⚓

You can easily use StreamGear API directly with any other Video Processing library(For e.g. OpenCV itself) in Real-time Frames Mode.

The complete usage example is as follows:

This just a bare-minimum example with OpenCV, but any other Real-time Frames Mode feature/example will work in the similar manner.

# import required libraries
from vidgear.gears import StreamGear
import cv2

# Open suitable video stream, such as webcam on first index(i.e. 0)
stream = cv2.VideoCapture(0) 

# describe a suitable manifest-file location/name
streamer = StreamGear(output="dash_out.mpd")

# loop over
while True:

    # read frames from stream
    (grabbed, frame) = stream.read()

    # check for frame if not grabbed
    if not grabbed:
      break

    # {do something with the frame here}
    # lets convert frame to gray for this example
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)


    # send frame to streamer
    streamer.stream(gray)

    # Show output window
    cv2.imshow("Output Gray Frame", gray)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.release()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import StreamGear
import cv2

# Open suitable video stream, such as webcam on first index(i.e. 0)
stream = cv2.VideoCapture(0) 

# describe a suitable manifest-file location/name
streamer = StreamGear(output="hls_out.m3u8", format = "hls")

# loop over
while True:

    # read frames from stream
    (grabbed, frame) = stream.read()

    # check for frame if not grabbed
    if not grabbed:
      break

    # {do something with the frame here}
    # lets convert frame to gray for this example
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)


    # send frame to streamer
    streamer.stream(gray)

    # Show output window
    cv2.imshow("Output Gray Frame", gray)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.release()

# safely close streamer
streamer.terminate()

Usage with Additional Streams⚓

Similar to Single-Source Mode, you can easily generate any number of additional Secondary Streams of variable bitrates or spatial resolutions, using exclusive -streams attribute of stream_params dictionary parameter. You just need to add each resolution and bitrate/framerate as list of dictionaries to this attribute, and rest is done automatically.

A more detailed information on -streams attribute can be found here ➶

The complete example is as follows:

Important -streams attribute Information
  • On top of these additional streams, StreamGear by default, generates a primary stream of same resolution and framerate1 as the input, at the index 0.
  • ⚠ Make sure your System/Machine/Server/Network is able to handle these additional streams, discretion is advised!
  • You MUST need to define -resolution value for your stream, otherwise stream will be discarded!
  • You only need either of -video_bitrate or -framerate for defining a valid stream. Since with -framerate value defined, video-bitrate is calculated automatically.
  • If you define both -video_bitrate and -framerate values at the same time, StreamGear will discard the -framerate value automatically.

Always use -stream attribute to define additional streams safely, any duplicate or incorrect definition can break things!

# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# Open suitable video stream, such as webcam on first index(i.e. 0)
stream = CamGear(source=0).start() 

# define various streams
stream_params = {
    "-streams": [
        {"-resolution": "1280x720", "-framerate": 30.0},  # Stream2: 1280x720 at 30fps framerate
        {"-resolution": "640x360", "-framerate": 60.0},  # Stream3: 640x360 at 60fps framerate
        {"-resolution": "320x240", "-video_bitrate": "500k"},  # Stream3: 320x240 at 500kbs bitrate
    ],
}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="dash_out.mpd")

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# Open suitable video stream, such as webcam on first index(i.e. 0)
stream = CamGear(source=0).start() 

# define various streams
stream_params = {
    "-streams": [
        {"-resolution": "1280x720", "-framerate": 30.0},  # Stream2: 1280x720 at 30fps framerate
        {"-resolution": "640x360", "-framerate": 60.0},  # Stream3: 640x360 at 60fps framerate
        {"-resolution": "320x240", "-video_bitrate": "500k"},  # Stream3: 320x240 at 500kbs bitrate
    ],
}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="hls_out.m3u8", format = "hls")

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()

Usage with File Audio-Input⚓

In Real-time Frames Mode, if you want to add audio to your streams, you've to use exclusive -audio attribute of stream_params dictionary parameter. You just need to input the path of your audio file to this attribute as string value, and the API will automatically validate as well as maps it to all generated streams.

The complete example is as follows:

Make sure this -audio audio-source it compatible with provided video-source, otherwise you could encounter multiple errors or no output at all.

You MUST use -input_framerate attribute to set exact value of input framerate when using external audio in Real-time Frames mode, otherwise audio delay will occur in output streams.

You can also assign a valid Audio URL as input, rather than filepath. More details can be found here ➶

# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(for e.g `foo1.mp4` file)
stream = CamGear(source='foo1.mp4').start() 

# add various streams, along with custom audio
stream_params = {
    "-streams": [
        {"-resolution": "1920x1080", "-video_bitrate": "4000k"},  # Stream1: 1920x1080 at 4000kbs bitrate
        {"-resolution": "1280x720", "-framerate": 30.0},  # Stream2: 1280x720 at 30fps
        {"-resolution": "640x360", "-framerate": 60.0},  # Stream3: 640x360 at 60fps
    ],
    "-input_framerate": stream.framerate, # controlled framerate for audio-video sync !!! don't forget this line !!!
    "-audio": "/home/foo/foo1.aac" # assigns input audio-source: "/home/foo/foo1.aac"
}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="dash_out.mpd", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(for e.g `foo1.mp4` file)
stream = CamGear(source='foo1.mp4').start() 

# add various streams, along with custom audio
stream_params = {
    "-streams": [
        {"-resolution": "1920x1080", "-video_bitrate": "4000k"},  # Stream1: 1920x1080 at 4000kbs bitrate
        {"-resolution": "1280x720", "-framerate": 30.0},  # Stream2: 1280x720 at 30fps
        {"-resolution": "640x360", "-framerate": 60.0},  # Stream3: 640x360 at 60fps
    ],
    "-input_framerate": stream.framerate, # controlled framerate for audio-video sync !!! don't forget this line !!!
    "-audio": "/home/foo/foo1.aac" # assigns input audio-source: "/home/foo/foo1.aac"
}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="hls_out.m3u8", format = "hls", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()

Usage with Device Audio-Input⚓

In Real-time Frames Mode, you've can also use exclusive -audio attribute of stream_params dictionary parameter for streaming live audio from external device. You just need to format your audio device name followed by suitable demuxer as list and assign to this attribute, and the API will automatically validate as well as map it to all generated streams.

The complete example is as follows:

Example Assumptions

  • You're running are Windows machine with all neccessary audio drivers and software installed.
  • There's a audio device with named "Microphone (USB2.0 Camera)" connected to your windows machine.
Using devices with -audio attribute on different OS platforms

Windows OS users can use the dshow (DirectShow) to list audio input device which is the preferred option for Windows users. You can refer following steps to identify and specify your sound card:

  • [OPTIONAL] Enable sound card(if disabled): First enable your Stereo Mix by opening the "Sound" window and select the "Recording" tab, then right click on the window and select "Show Disabled Devices" to toggle the Stereo Mix device visibility. Follow this post ➶ for more details.

  • Identify Sound Card: Then, You can locate your soundcard using dshow as follows:

    c:\> ffmpeg -list_devices true -f dshow -i dummy
    ffmpeg version N-45279-g6b86dd5... --enable-runtime-cpudetect
      libavutil      51. 74.100 / 51. 74.100
      libavcodec     54. 65.100 / 54. 65.100
      libavformat    54. 31.100 / 54. 31.100
      libavdevice    54.  3.100 / 54.  3.100
      libavfilter     3. 19.102 /  3. 19.102
      libswscale      2.  1.101 /  2.  1.101
      libswresample   0. 16.100 /  0. 16.100
    [dshow @ 03ACF580] DirectShow video devices
    [dshow @ 03ACF580]  "Integrated Camera"
    [dshow @ 03ACF580]  "USB2.0 Camera"
    [dshow @ 03ACF580] DirectShow audio devices
    [dshow @ 03ACF580]  "Microphone (Realtek High Definition Audio)"
    [dshow @ 03ACF580]  "Microphone (USB2.0 Camera)"
    dummy: Immediate exit requested
    
  • Specify Sound Card: Then, you can specify your located soundcard in StreamGear as follows:

    # assign appropriate input audio-source device and demuxer device and demuxer
    stream_params = {"-audio": ["-f","dshow", "-i", "audio=Microphone (USB2.0 Camera)"]}
    

If audio still doesn't work then checkout this troubleshooting guide ➶ or reach us out on Gitter ➶ Community channel

Linux OS users can use the alsa to list input device to capture live audio input such as from a webcam. You can refer following steps to identify and specify your sound card:

  • Identify Sound Card: To get the list of all installed cards on your machine, you can type arecord -l or arecord -L (longer output).

    arecord -l
    
    **** List of CAPTURE Hardware Devices ****
    card 0: ICH5 [Intel ICH5], device 0: Intel ICH [Intel ICH5]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 0: ICH5 [Intel ICH5], device 1: Intel ICH - MIC ADC [Intel ICH5 - MIC ADC]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 0: ICH5 [Intel ICH5], device 2: Intel ICH - MIC2 ADC [Intel ICH5 - MIC2 ADC]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 0: ICH5 [Intel ICH5], device 3: Intel ICH - ADC2 [Intel ICH5 - ADC2]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 1: U0x46d0x809 [USB Device 0x46d:0x809], device 0: USB Audio [USB Audio]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    
  • Specify Sound Card: Then, you can specify your located soundcard in WriteGear as follows:

    The easiest thing to do is to reference sound card directly, namely "card 0" (Intel ICH5) and "card 1" (Microphone on the USB web cam), as hw:0 or hw:1

    # assign appropriate input audio-source device and demuxer device and demuxer 
    stream_params = {"-audio": ["-f","alsa", "-i", "hw:1"]}
    

If audio still doesn't work then reach us out on Gitter ➶ Community channel

MAC OS users can use the avfoundation to list input devices for grabbing audio from integrated iSight cameras as well as cameras connected via USB or FireWire. You can refer following steps to identify and specify your sound card on MacOS/OSX machines:

  • Identify Sound Card: Then, You can locate your soundcard using avfoundation as follows:

    ffmpeg -f avfoundation -list_devices true -i ""
    ffmpeg version N-45279-g6b86dd5... --enable-runtime-cpudetect
      libavutil      51. 74.100 / 51. 74.100
      libavcodec     54. 65.100 / 54. 65.100
      libavformat    54. 31.100 / 54. 31.100
      libavdevice    54.  3.100 / 54.  3.100
      libavfilter     3. 19.102 /  3. 19.102
      libswscale      2.  1.101 /  2.  1.101
      libswresample   0. 16.100 /  0. 16.100
    [AVFoundation input device @ 0x7f8e2540ef20] AVFoundation video devices:
    [AVFoundation input device @ 0x7f8e2540ef20] [0] FaceTime HD camera (built-in)
    [AVFoundation input device @ 0x7f8e2540ef20] [1] Capture screen 0
    [AVFoundation input device @ 0x7f8e2540ef20] AVFoundation audio devices:
    [AVFoundation input device @ 0x7f8e2540ef20] [0] Blackmagic Audio
    [AVFoundation input device @ 0x7f8e2540ef20] [1] Built-in Microphone
    
  • Specify Sound Card: Then, you can specify your located soundcard in StreamGear as follows:

    # assign appropriate input audio-source device and demuxer
    stream_params = {"-audio": ["-f","avfoundation", "-audio_device_index", "0"]}
    

If audio still doesn't work then reach us out on Gitter ➶ Community channel

Make sure this -audio audio-source it compatible with provided video-source, otherwise you could encounter multiple errors or no output at all.

You MUST use -input_framerate attribute to set exact value of input framerate when using external audio in Real-time Frames mode, otherwise audio delay will occur in output streams.

It is advised to use this example with live-streaming enabled(True) by using StreamGear API's exclusive -livestream attribute of stream_params dictionary parameter.

# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(for e.g `foo1.mp4` file)
stream = CamGear(source="foo1.mp4").start()

# add various streams, along with custom audio
stream_params = {
    "-streams": [
        {
            "-resolution": "1280x720",
            "-video_bitrate": "4000k",
        },  # Stream1: 1280x720 at 4000kbs bitrate
        {"-resolution": "640x360", "-framerate": 30.0},  # Stream2: 640x360 at 30fps
    ],
    "-input_framerate": stream.framerate,  # controlled framerate for audio-video sync !!! don't forget this line !!!
    "-audio": [
        "-f",
        "dshow",
        "-i",
        "audio=Microphone (USB2.0 Camera)",
    ],  # assign appropriate input audio-source device and demuxer
}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="dash_out.mpd", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break

    # {do something with the frame here}

    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import CamGear
from vidgear.gears import StreamGear
import cv2

# open any valid video stream(for e.g `foo1.mp4` file)
stream = CamGear(source="foo1.mp4").start()

# add various streams, along with custom audio
stream_params = {
    "-streams": [
        {
            "-resolution": "1280x720",
            "-video_bitrate": "4000k",
        },  # Stream1: 1280x720 at 4000kbs bitrate
        {"-resolution": "640x360", "-framerate": 30.0},  # Stream2: 640x360 at 30fps
    ],
    "-input_framerate": stream.framerate,  # controlled framerate for audio-video sync !!! don't forget this line !!!
    "-audio": [
        "-f",
        "dshow",
        "-i",
        "audio=Microphone (USB2.0 Camera)",
    ],  # assign appropriate input audio-source device and demuxer
}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="dash_out.m3u8", format="hls", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break

    # {do something with the frame here}

    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()

Usage with Hardware Video-Encoder⚓

In Real-time Frames Mode, you can also easily change encoder as per your requirement just by passing -vcodec FFmpeg parameter as an attribute in stream_params dictionary parameter. In addition to this, you can also specify the additional properties/features/optimizations for your system's GPU similarly.

In this example, we will be using h264_vaapi as our hardware encoder and also optionally be specifying our device hardware's location (i.e. '-vaapi_device':'/dev/dri/renderD128') and other features such as '-vf':'format=nv12,hwupload' like properties by formatting them as option dictionary parameter's attributes, as follows:

Check VAAPI support

This example is just conveying the idea on how to use FFmpeg's hardware encoders with WriteGear API in Compression mode, which MAY/MAY-NOT suit your system. Kindly use suitable parameters based your supported system and FFmpeg configurations only.

To use h264_vaapi encoder, remember to check if its available and your FFmpeg compiled with VAAPI support. You can easily do this by executing following one-liner command in your terminal, and observing if output contains something similar as follows:

ffmpeg  -hide_banner -encoders | grep vaapi 

 V..... h264_vaapi           H.264/AVC (VAAPI) (codec h264)
 V..... hevc_vaapi           H.265/HEVC (VAAPI) (codec hevc)
 V..... mjpeg_vaapi          MJPEG (VAAPI) (codec mjpeg)
 V..... mpeg2_vaapi          MPEG-2 (VAAPI) (codec mpeg2video)
 V..... vp8_vaapi            VP8 (VAAPI) (codec vp8)
# import required libraries
from vidgear.gears import VideoGear
from vidgear.gears import StreamGear
import cv2

# Open suitable video stream, such as webcam on first index(i.e. 0)
stream = VideoGear(source=0).start() 

# add various streams with custom Video Encoder and optimizations
stream_params = {
    "-streams": [
        {"-resolution": "1920x1080", "-video_bitrate": "4000k"},  # Stream1: 1920x1080 at 4000kbs bitrate
        {"-resolution": "1280x720", "-framerate": 30.0},  # Stream2: 1280x720 at 30fps
        {"-resolution": "640x360", "-framerate": 60.0},  # Stream3: 640x360 at 60fps
    ],
    "-vcodec": "h264_vaapi", # define custom Video encoder
    "-vaapi_device": "/dev/dri/renderD128", # define device location
    "-vf": "format=nv12,hwupload",  # define video pixformat
}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="dash_out.mpd", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()
# import required libraries
from vidgear.gears import VideoGear
from vidgear.gears import StreamGear
import cv2

# Open suitable video stream, such as webcam on first index(i.e. 0)
stream = VideoGear(source=0).start() 

# add various streams with custom Video Encoder and optimizations
stream_params = {
    "-streams": [
        {"-resolution": "1920x1080", "-video_bitrate": "4000k"},  # Stream1: 1920x1080 at 4000kbs bitrate
        {"-resolution": "1280x720", "-framerate": 30.0},  # Stream2: 1280x720 at 30fps
        {"-resolution": "640x360", "-framerate": 60.0},  # Stream3: 640x360 at 60fps
    ],
    "-vcodec": "h264_vaapi", # define custom Video encoder
    "-vaapi_device": "/dev/dri/renderD128", # define device location
    "-vf": "format=nv12,hwupload",  # define video pixformat
}

# describe a suitable manifest-file location/name and assign params
streamer = StreamGear(output="hls_out.m3u8", format = "hls", **stream_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if Nonetype
    if frame is None:
        break


    # {do something with the frame here}


    # send frame to streamer
    streamer.stream(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close streamer
streamer.terminate()

 


  1. 💡 In Real-time Frames Mode, the Primary Stream's framerate defaults to -input_framerate attribute value, if defined, else it will be 25fps. 


Last update: July 31, 2022