[FFmpeg-devel] Adding MPEG user data on encode.
Wed Dec 16 18:00:56 CET 2009
I'm adding MPEG user data encoding to ffmpeg for my own app, but
I'd like to do it in a way that allows it to be integrated upstream.
The basic approach I'm planning to take is to add these to
Where userdata is set to NULL when not used and points to a
buffer containing MPEG user data when not NULL and userdata_size
is set to a positive number of bytes. Then MPV_encode_picture
picks this up and inserts the user data on the encoded frames,
but with the smarts to delay CEA-708 data until the next I or
P frame since that spec doesn't specify whether the CEA-708
user data should be in DTS or PTS order.
In the future I can see this being extended for decode as well.
Right now mpeg_decode_user_data only decodes DTG1 data, but the
MythTV fork also decodes DVB CC, ATSC CEA-708 & CEA-608 and
CEA-608 in DVB; but in a way that is not likely to be accepted
into ffmpeg proper.
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