FFmpeg

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Author	SHA1	Message	Date
Nekopanda	8b154cb3e9	avcodec/mpeg2dec: Fix field selection for skipped macroblocks For B field pictures, the spec says, > The prediction shall be made from the field of the same parity as the field being predicted. I did it. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>	7 years ago
wm4	8f6f232228	ffmpeg: use new decode API This is a bit messy, mainly due to timestamp handling. decode_video() relied on the fact that it could set dts on a flush/drain packet. This is not possible with the old API, and won't be. (I think doing this was very questionable with the old API. Flush packets should not contain any information; they just cause a FIFO to be emptied.) This is replaced with checking the best_effort_timestamp for AV_NOPTS_VALUE, and using the suggested DTS in the drain case. The modified tests (fate-cavs and others) still fails due to dropping the last frame. This happens because the timestamp of the last frame goes backwards (ffprobe -show_frames shows the same thing). I suspect that this "worked" due to the best effort timestamp logic picking the DTS over the decreasing PTS. Since this logic is in libavcodec (where it probably shouldn't be), this can't be easily fixed. The timestamps of the cavs samples are weird anyway, so I chose not to fix it. Another strange thing is the timestamp handling in the video path of process_input_packet (after the decode_video() call). It looks like the code to increase next_dts and next_pts should be run every time a frame is decoded - but it's needed even if output is skipped.	9 years ago
Michael Niedermayer	68d619a31c	fate: Add regression test for Ticket 186 Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>	9 years ago

Author

SHA1

Message

Date

Nekopanda

8b154cb3e9

avcodec/mpeg2dec: Fix field selection for skipped macroblocks

For B field pictures, the spec says,

> The prediction shall be made from the field of the same parity as the field being predicted.

I did it.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

7 years ago

wm4

8f6f232228

ffmpeg: use new decode API

This is a bit messy, mainly due to timestamp handling.

decode_video() relied on the fact that it could set dts on a flush/drain
packet. This is not possible with the old API, and won't be. (I think
doing this was very questionable with the old API. Flush packets should
not contain any information; they just cause a FIFO to be emptied.) This
is replaced with checking the best_effort_timestamp for AV_NOPTS_VALUE,
and using the suggested DTS in the drain case.

The modified tests (fate-cavs and others) still fails due to dropping
the last frame. This happens because the timestamp of the last frame
goes backwards (ffprobe -show_frames shows the same thing). I suspect
that this "worked" due to the best effort timestamp logic picking the
DTS over the decreasing PTS. Since this logic is in libavcodec (where
it probably shouldn't be), this can't be easily fixed. The timestamps
of the cavs samples are weird anyway, so I chose not to fix it.

Another strange thing is the timestamp handling in the video path of
process_input_packet (after the decode_video() call). It looks like
the code to increase next_dts and next_pts should be run every time
a frame is decoded - but it's needed even if output is skipped.

9 years ago

Michael Niedermayer

68d619a31c

fate: Add regression test for Ticket 186

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

9 years ago

3 Commits (bb3648e6766fa3a3f323983f69b57c9b7821583c)