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Webcam server
=============
This example illustrates how to read frames from a webcam and send them
to a browser.
Running
-------
First install the required packages:
.. code-block:: console
$ pip install aiohttp aiortc
When you start the example, it will create an HTTP server which you
can connect to from your browser:
.. code-block:: console
$ python webcam.py
You can then browse to the following page with your browser:
http://127.0.0.1:8080
Once you click `Start` the server will send video from its webcam to the
browser.
.. warning:: Due to the timing of when Firefox starts responding to mDNS
requests and the current lack of ICE trickle support in aiortc, this example
may not work with Firefox. For details see:
https://github.com/aiortc/aiortc/issues/481 and
https://bugzilla.mozilla.org/show_bug.cgi?id=1691189
Additional options
------------------
If you want to play a media file instead of using the webcam, run:
.. code-block:: console
$ python webcam.py --play-from video.mp4
Pre-encoded Opus audio
......................
If you want to play an OGG file containing Opus audio without decoding the frames, run:
.. code-block:: console
$ python webcam.py --play-from audio.ogg --play-without-decoding --audio-codec audio/opus
You can generate an example of such a file using:
.. code-block:: console
$ ffmpeg -f lavfi -i "sine=frequency=1000:duration=20" -codec:a libopus -f ogg audio.ogg
Pre-encoded H.264 video
.......................
If you want to play an MPEGTS file containing H.264 video without decoding the frames, run:
.. code-block:: console
$ python webcam.py --play-from video.ts --play-without-decoding --video-codec video/H264
You can generate an example of such a file using:
.. code-block:: console
$ ffmpeg -f lavfi -i testsrc=duration=20:size=640x480:rate=30 -pix_fmt yuv420p -codec:v libx264 -profile:v baseline -level 31 -f mpegts video.ts
Pre-encoded VP8 video
.....................
If you want to play a WebM file containing VP8 video without decoding the frames, run:
.. code-block:: console
$ python webcam.py --play-from video.webm --play-without-decoding --video-codec video/VP8
You can generate an example of such a file using:
.. code-block:: console
$ ffmpeg -f lavfi -i testsrc=duration=20:size=640x480:rate=30 -codec:v vp8 -f webm video.webm
Credits
-------
The original idea for the example was from Marios Balamatsias.
Support for playback without decoding was based on an example by Renan Prata.
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