mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-06-25 01:10:44 +00:00
Code Issues 1 Projects Releases Wiki Activity

avvidenc: Don't take ffmpeg timestamps verbatim but only use them to calculate DTS

Browse source 
The ffmpeg timestamps are inaccurate and only in framerate granularity.
To avoid generating inaccurate output timestamps, especially with
variable framerate streams, only use the ffmpeg timestamps for
calculating the DTS.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1544
again.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3780>
This commit is contained in:
Sebastian Dröge 2023-01-24 15:38:20 +02:00 committed by GStreamer Marge Bot
parent 5372b77987
commit 13fc49770e
1 changed files with 18 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

30
subprojects/gst-libav/ext/libav/gstavvidenc.c
View file

@ -717,19 +717,25 @@ gst_ffmpegvidenc_receive_packet (GstFFMpegVidEnc * ffmpegenc,
GST_VIDEO_CODEC_FRAME_UNSET_SYNC_POINT (frame);
}
if (pkt->dts != AV_NOPTS_VALUE) {
frame->dts =
gst_ffmpeg_time_ff_to_gst (pkt->dts + ffmpegenc->pts_offset,
ffmpegenc->context->time_base);
}
/* This will lose some precision compared to setting the PTS from the input
* buffer directly, but that way we're sure PTS and DTS are consistent, in
* particular DTS should always be <= PTS
/* calculate the DTS by taking the PTS/DTS difference from the ffmpeg side
* and applying it to our PTS. We don't use the ffmpeg timestamps verbatim
* because they're too inaccurate and in the framerate time_base
*/
if (pkt->pts != AV_NOPTS_VALUE) {
frame->pts =
gst_ffmpeg_time_ff_to_gst (pkt->pts + ffmpegenc->pts_offset,
ffmpegenc->context->time_base);
if (pkt->dts != AV_NOPTS_VALUE) {
gint64 pts_dts_diff = pkt->dts - pkt->pts;
if (pts_dts_diff < 0) {
GstClockTime gst_pts_dts_diff = gst_ffmpeg_time_ff_to_gst (-pts_dts_diff,
ffmpegenc->context->time_base);
if (gst_pts_dts_diff > frame->pts)
frame->pts = 0;
else
frame->dts = frame->pts - gst_pts_dts_diff;
} else {
frame->dts = frame->pts +
gst_ffmpeg_time_ff_to_gst (pts_dts_diff,
ffmpegenc->context->time_base);
}
}
ret = gst_video_encoder_finish_frame (GST_VIDEO_ENCODER (ffmpegenc), frame);