#8007: bsf_dump_extra repeat tables
-------------------------------------+-------------------------------------
Reporter: atorp | Type: defect
Status: new | Priority: normal
Component: avfilter | Version: git-
Keywords: | master
bsf_dump_extra | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug: When using the "bsf_dump_extra" some tables are
repeated.
How to reproduce:
{{{
% ffmpeg -i input.ts -c:v mpeg2_qsv -bsf:v dump_extra out.ts
}}}
With this example, the resulting "out.ts" file has an incorrect header in
the first I frame. In this frame the PES tables "SEQUENCE HEADER" and
"SEQUENCE EXTENSION" are repeated. And that's a clear bug!
The problem is based on this: The MPEG-2 QSV encoder doesn't repeat these
tables. So they only appear in the bitstream in the first I frame. Then
every new GOP lacks the tables, and as result the bitstream is not
suitable for Broadcasting: If you start to play after the first GOP you
can't reproduce the stream.
The solution is then to use the bitstream filter "dump_extra". This filter
repeats the required tables at every GOP. But..., the current
implementation doesn't check for the existence of a table, and always
inserts it... even if they already exists.
So, please can you review the code and fix this bug? The idea is to check
the existence of a table before inserting it.
Thank you!
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8007>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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