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Code Issues Releases Activity

fftools/ffmpeg_enc: avoid breaking exactly integer timestamps in vsync code

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The code will currently add a small offset to avoid exact midpoints, but
this can cause inexact results when a float timestamp is exactly
representable as an integer.

Fixes off-by-one in the first frame duration in multiple FATE tests.
This commit is contained in:
Anton Khirnov 2023-05-28 16:22:58 +02:00
parent c7a05ac117
commit ccf219e361
5 changed files with 8 additions and 6 deletions
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6
fftools/ffmpeg_enc.c
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@ -888,9 +888,11 @@ static double adjust_frame_pts_to_encoder_tb(OutputFile *of, OutputStream *ost,
float_pts = av_rescale_q(frame->pts, filter_tb, tb) -
av_rescale_q(start_time, AV_TIME_BASE_Q, tb);
float_pts /= 1 << extra_bits;
// avoid exact midoints to reduce the chance of rounding differences, this
// when float_pts is not exactly an integer,
// avoid exact midpoints to reduce the chance of rounding differences, this
// can be removed in case the fps code is changed to work with integers
float_pts += FFSIGN(float_pts) * 1.0 / (1<<17);
if (float_pts != llrint(float_pts))
float_pts += FFSIGN(float_pts) * 1.0 / (1<<17);
frame->pts = av_rescale_q(frame->pts, filter_tb, enc->time_base) -
av_rescale_q(start_time, AV_TIME_BASE_Q, enc->time_base);

2
tests/ref/fate/apng-osample
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@ -3,7 +3,7 @@
#codec_id 0: rawvideo
#dimensions 0: 116x135
#sar 0: 0/1
0, 0, 0, 2, 62640, 0x31eb581d
0, 0, 0, 3, 62640, 0x31eb581d
0, 3, 3, 3, 62640, 0x29e11b82
0, 6, 6, 3, 62640, 0x207ed588
0, 9, 9, 3, 62640, 0x3845c906

2
tests/ref/fate/film-cvid
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@ -3,7 +3,7 @@
#codec_id 0: rawvideo
#dimensions 0: 320x224
#sar 0: 0/1
0, 0, 0, 1, 215040, 0x067c5362
0, 0, 0, 2, 215040, 0x067c5362
0, 2, 2, 2, 215040, 0xd9eacb98
0, 4, 4, 2, 215040, 0x3c8a4cbd
0, 6, 6, 2, 215040, 0xbdf996e1

2
tests/ref/fate/filter-concat-vfr
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@ -8,7 +8,7 @@
#codec_id 1: pcm_s16le
#sample_rate 1: 44100
#channel_layout_name 1: mono
0, 0, 0, 199999, 230400, 0x88c4d19a
0, 0, 0, 200000, 230400, 0x88c4d19a
1, 0, 0, 1024, 2048, 0xb3f10192
1, 1024, 1024, 1024, 2048, 0xb340fe4e
1, 2048, 2048, 1024, 2048, 0x0a5f0111

2
tests/ref/fate/gif-gray
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@ -3,7 +3,7 @@
#codec_id 0: rawvideo
#dimensions 0: 480x360
#sar 0: 0/1
0, 0, 0, 4, 691200, 0xef6c0f3d
0, 0, 0, 5, 691200, 0xef6c0f3d
0, 5, 5, 2, 691200, 0xc18b32de
0, 7, 7, 2, 691200, 0x2395a3d7
0, 9, 9, 2, 691200, 0x81dc3cf2