Webcodecs: VideoEncoder format:{avc:avc}

[amythical]

Hi,

    Very excited about webcodecs and using them to encode and decode videos in the browser.

Goal - Generate VideoFrames from a HTML Canvas Element, encode chunks using the VideoEncoder with format{avc:avc} and mux the chunks into a h264/mp4.

I have recently hit a roadblock and there are no demos, documentation is vague around the avc formats output in the Video Encoder.

The chunks that I get from the VideoEncoder when format:{avc:avc} is used, cannot be muxed into a h264, throws up an error. 

My source is a set of VideoFrames generated from a html canvas.

I did some reading and I understand that some extra data needs to be appended to each chunk for decoding.

I assumed this would be generated by the encoder and I printed the meta along with the chunk but the description is empty but there is other meta data inside the decoderConfig (colors, width, height, hardware-preference and so on)

PS - The annexb chunks work fine , but the quality is very bad with pixelation.

Any help or pointers would be appreciated.

Thanks,

Amit Deshpande

[Dale Curtis]

avc vs annexb just changes the bitstream layout, it won't affect quality. annexb is correct for writing into a '.h264' file as understood by ffmpeg. You likely need to try some different encoding settings particularly bitrate and bitrateMode to improve quality.

- dale

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