mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-03-30 12:49:40 +00:00
Code Issues 1 Projects Releases Wiki Activity

qtmux: Allow up to 1 trak timescale unit of lateness in prefill mode

Browse source 
For 59.94 FPS, it's common to set 60000 as timescale. For that
timescale, if the audio is late by as little as 0:00:00.000016666
(definitely less than one audio sample), lateness gets rounded to 1.
Added a safeguard that allows lateness up to 1 sample with the specific
trak's timescale, to make sure that values less than e.g. one audio
sample won't break the prefill mode. What will happen in this case is
that the audio will get squeezed back to the video's timestamp, which in
practice means that the audio will be 0.000016666 seconds early (with
the patch).

https://bugzilla.gnome.org/show_bug.cgi?id=797133
This commit is contained in:
Vivia Nikolaidou 2018-09-12 17:24:00 +03:00
parent 43c5db3c72
commit 94f8603411
1 changed files with 7 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
gst/isomp4/gstqtmux.c
View file

@ -3454,13 +3454,18 @@ gst_qt_mux_update_edit_lists (GstQTMux * qtmux)
has_gap = (qtpad->first_ts > (qtmux->first_ts + qtpad->dts_adjustment));
if (has_gap) {
GstClockTime diff;
GstClockTime diff, trak_lateness;
diff = qtpad->first_ts - (qtmux->first_ts + qtpad->dts_adjustment);
lateness = gst_util_uint64_scale_round (diff,
qtmux->timescale, GST_SECOND);
/* Allow up to 1 trak timescale unit of lateness, Such a small
* timestamp/duration can't be represented by the trak-specific parts
* of the headers anyway, so it's irrelevantly small */
trak_lateness = gst_util_uint64_scale (diff,
atom_trak_get_timescale (qtpad->trak), GST_SECOND);
if (lateness > 0) {
if (lateness > 0 && trak_lateness > 0) {
GST_DEBUG_OBJECT (qtmux,
"Pad %s is a late stream by %" GST_TIME_FORMAT,
GST_PAD_NAME (qtpad->collect.pad), GST_TIME_ARGS (diff));