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doc/bitstream_filters: elaborate on h264_redundant_pps

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Signed-off-by: Marth64 <marth64@proxyid.net>
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Marth64 2024-10-12 11:44:49 -05:00
parent 13129f1af4
commit 6d5a0998b6
1 changed files with 15 additions and 3 deletions
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doc/bitstream_filters.texi
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@ -423,9 +423,21 @@ Please note that this filter is auto-inserted for MPEG-TS (muxer
@section h264_redundant_pps @section h264_redundant_pps
This applies a specific fixup to some Blu-ray streams which contain This applies a specific fixup to some Blu-ray BDMV H264 streams
redundant PPSs modifying irrelevant parameters of the stream which which contain redundant PPSs. The PPSs modify irrelevant parameters
confuse other transformations which require correct extradata. of the stream, confusing other transformations which require
the correct extradata.
The encoder used on these impacted streams adds extra PPSs throughout
the stream, varying the initial QP and whether weighted prediction
was enabled. This causes issues after copying the stream into
a global header container, as the starting PPS is not suitable
for the rest of the stream. One side effect, for example,
is seeking will return garbled output until a new PPS appears.
This BSF removes the extra PPSs and rewrites the slice headers
such that the stream uses a single leading PPS in the global header,
which resolves the issue.
@section hevc_metadata @section hevc_metadata