On Mon, 16 Dec 2019, Michael Niedermayer wrote:
On Mon, Dec 16, 2019 at 12:16:14AM +0200, Martin Storsjö wrote:
Keep all the existing data fields as they are (there's lots and
lots of nontrivial calculation and heuristics based on them in
their current form), but derive the duration as the difference
between the pts of the first packet to the maximum pts+duration
(not necessarily the last packet); use this duration in any box
where the actual presentation duration is supposed to be.
Fixes: 8420
---
libavformat/movenc.c | 21 ++++++++++++++++-----
tests/ref/lavf/mov | 4 ++--
tests/ref/lavf/mp4 | 4 ++--
3 files changed, 20 insertions(+), 9 deletions(-)
This seems to loose duration for this: (not sure which way is more correct)
./ffmpeg -i ~/tickets/2892/MPEG_tbn_test.mov -c:v copy -c:a copy -vtag mx3n -timecode
10:00:00:00 -vframes 3 x.mov && ./ffprobe -v x.mov -show_packets -print_format
compact
Thanks for testing. Seems like there's a special case for how
track_duration is updated for tmcd tracks, where it's updated based on
another track; I'll update the patch to fetch the effective duration for
that other track instead.
// Martin
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