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avcodec: add a bsf to reorder DTS into PTS

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Starting with an h264 implementation. Can be extended to support other codecs.

A few caveats:
- OpenGOP streams are currently not supported. The firt packet must be an IDR
  frame.
- In some streams, a few frames at the end may not get a reordered PTS when
  they reference frames past EOS. The code added to derive timestamps from
  previous frames needs to extended.

Addresses ticket #502.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2022-08-15 14:46:09 -03:00
parent 8f4b000c37
commit b92e14147f
6 changed files with 540 additions and 1 deletions
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libavcodec/bitstream_filters.c
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@@ -31,6 +31,7 @@ extern const FFBitStreamFilter ff_av1_metadata_bsf;
extern const FFBitStreamFilter ff_chomp_bsf;
extern const FFBitStreamFilter ff_dump_extradata_bsf;
extern const FFBitStreamFilter ff_dca_core_bsf;
extern const FFBitStreamFilter ff_dts2pts_bsf;
extern const FFBitStreamFilter ff_dv_error_marker_bsf;
extern const FFBitStreamFilter ff_eac3_core_bsf;
extern const FFBitStreamFilter ff_extract_extradata_bsf;