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* [FFmpeg-devel] [PATCH] avformat/demux: in case of no timestamps, calculate dts based on previous dts and duration
@ 2023-05-05 11:31 Jan Ekström
  2023-05-05 11:37 ` "zhilizhao(赵志立)"
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Jan Ekström @ 2023-05-05 11:31 UTC (permalink / raw)
  To: ffmpeg-devel

From: Martin Machalek <martin.machalek@24i.com>

Adds DTS to packets which would otherwise break tbr calculation
within libavformat, as well as packet rate calculation in ffmpeg.

An example of such input would be an MPEG-TS stream where a whole
GOP is put into a single PES packet.

Co-authored-by: Jan Ekström <jan.ekstrom@24i.com>

Signed-off-by: Jan Ekström <jan.ekstrom@24i.com>
---
 libavformat/demux.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/demux.c b/libavformat/demux.c
index 06de71cd6e..9a4ab28679 100644
--- a/libavformat/demux.c
+++ b/libavformat/demux.c
@@ -1098,6 +1098,11 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
     if (!onein_oneout)
         // This should happen on the first packet
         update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
+
+    if (pkt->dts == AV_NOPTS_VALUE && !is_relative(sti->cur_dts) &&
+        sti->cur_dts != AV_NOPTS_VALUE && pkt->duration > 0)
+        pkt->dts = sti->cur_dts + pkt->duration;
+
     if (pkt->dts > sti->cur_dts)
         sti->cur_dts = pkt->dts;
 
-- 
2.40.1

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^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2023-05-05 20:25 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-05-05 11:31 [FFmpeg-devel] [PATCH] avformat/demux: in case of no timestamps, calculate dts based on previous dts and duration Jan Ekström
2023-05-05 11:37 ` "zhilizhao(赵志立)"
2023-05-05 11:42 ` Anton Khirnov
2023-05-05 20:25 ` Michael Niedermayer

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