On Thu, Feb 28, 2019 at 11:33:50AM +0800, Yukun Guo wrote: > The error message "co located POCs unavailable" is reported when the > co-located picture of an H.264 B frame is missing during spatial direct > predition. It comes from this line: > https://github.com/FFmpeg/FFmpeg/blob/n4.1.1/libavcodec/h264_direct.c#L156 > and was originally commited for solving an issue found by fuzzing: > https://bugzilla.mozilla.org/show_bug.cgi?id=1230286. > > I think the condition is quite normal for live streaming, 1) when the > player first connects to the streaming server, it may receive B frames > whose reference frames have never been sent; 2) when the bandwidth is > limited, the server purposely drops packets due to buffer overflow. > IMHO the log level should be on par with "Frame num gap" (if > `gaps_in_frame_num_value_allowed_flag` is false) and "no picture" > (both are found in h264_slice.c and use DEBUG level).
/**
* Something went wrong and cannot losslessly be recovered.
* However, not all future data is affected.
*/
#define AV_LOG_ERROR 16
When data is missing (in live streaming or otherwise) it under almost all
cases cannot be losslessly recovered. So this use matches the definition
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Old school: Use the lowest level language in which you can solve the problem
conveniently.
New school: Use the highest level language in which the latest supercomputer
can solve the problem without the user falling asleep waiting.
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