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mp4mux: Don't write gap edit lists if their duration would be zero

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The track might start later than the earliest track by less than one
timescale units, in which case writing an empty gap edit list would be
useless and confusing.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1014>
This commit is contained in:
Sebastian Dröge 2022-12-15 18:45:19 +02:00
parent f8024f072f
commit ed429d570e
1 changed files with 18 additions and 12 deletions
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30
mux/mp4/src/mp4mux/boxes.rs
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@ -1646,24 +1646,30 @@ fn write_elst(
let min_earliest_pts = header.streams.iter().map(|s| s.earliest_pts).min().unwrap();
if min_earliest_pts != stream.earliest_pts {
// Entry count
v.extend(2u32.to_be_bytes());
// First entry for the gap
// Edit duration
let gap = (stream.earliest_pts - min_earliest_pts)
.nseconds()
.mul_div_round(timescale as u64, gst::ClockTime::SECOND.nseconds())
.context("too big gap")?;
v.extend(gap.to_be_bytes());
// Media time
v.extend((-1i64).to_be_bytes());
if gap > 0 {
// Entry count
v.extend(2u32.to_be_bytes());
// Media rate
v.extend(1u16.to_be_bytes());
v.extend(0u16.to_be_bytes());
// First entry for the gap
// Edit duration
v.extend(gap.to_be_bytes());
// Media time
v.extend((-1i64).to_be_bytes());
// Media rate
v.extend(1u16.to_be_bytes());
v.extend(0u16.to_be_bytes());
} else {
// Entry count
v.extend(1u32.to_be_bytes());
}
} else {
// Entry count
v.extend(1u32.to_be_bytes());