[FFmpeg-devel] [PATCH] avformat/matroska: Parse generic encryption info from packets.

Jacob Trimble modmaker at google.com
Mon Jul 23 23:59:45 EEST 2018


On Thu, Jul 12, 2018 at 4:45 PM Jacob Trimble <modmaker at google.com> wrote:
>
> The attached patch adds parsing for WebM encryption info into the
> AVEncryptionInfo side-data.  The AVEncryptionInitInfo will be handled
> in another patch.
>
> Spec: https://www.webmproject.org/docs/webm-encryption/
>
> I am currently seeing a problem with this when using Opus audio.  In
> read_frame_internal, it will try to parse the resulting packet.  For
> video, which uses subsample encryption, it is able to parse the
> headers; but for Opus, which uses full-sample encryption, it fails to
> parse the headers.  This causes the read_frame_internal to drop the
> packet.
>
> I have traced a workaround to opus_parse in opus_parser.c: instead of
> setting poutbuf to NULL, set it to the buffer and just pass the packet
> to the app to handle it.  The frame will be decrypted before passing
> to the decoder.  I can't just disable parsing in the demuxer because I
> want to parse the packets for clear content and when using subsample
> encryption.
>
> Does anyone have any other ideas to work around this?  Is there a way
> to allow parsing but ignore errors?

Ping.


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