[FFmpeg-devel] [PATCH 0/1] avformat/movenc: fix HEVC fmp4 HLS init segment for Apple playback

[David McElroy <david@mcelroy.online>]

Hi FFmpeg developers,

This patch fixes a bug that makes HEVC fmp4 HLS streams generated by FFmpeg
unplayable on all Apple platforms (macOS/iOS Safari, QuickTime, etc.).

The issue is a malformed init segment, as detailed in the commit message.

A similar patch was proposed in November 2023 by Jay Zhang,
but it was never merged.
https://lists.ffmpeg.org/pipermail/ffmpeg-devel/2023-November/317173.html

**To Reproduce the Bug:**

You can generate a problematic HLS init segment using a command like this on
the current master branch:
$ ffmpeg -i ../BigBuckBunny_short.mp4 -c:v libx265 -f hls -hls_segment_type fmp4 playlist.m3u8

**Sample Files:**

To make review easier, I've uploaded two sample streams produced with that
command from that file from latest master (commit 9c9b41b)
with and without the patch applied:

- Source file: https://david.mcelroy.online/ffmpegbug/examples/BigBuckBunny_short.mp4

- Broken stream (from master): https://david.mcelroy.online/ffmpegbug/examples/9c9b41b/playlist.m3u8
- Fixed stream (with this patch): https://david.mcelroy.online/ffmpegbug/examples/patched/playlist.m3u8

These links can be loaded directly in Safari to see the playback issue.

- Broken init segment (from master): https://david.mcelroy.online/ffmpegbug/examples/9c9b41b/init.mp4
- Fixed init segment (with this patch): https://david.mcelroy.online/ffmpegbug/examples/patched/init.mp4

You may also note that when selected in Finder, the broken init segment fails
to be recognized as HEVC video, while the fixed one is recognized correctly.

I also ran `make fate` to ensure no regressions were introduced and all
tests passed.

The commit contains the full technical details of the fix.

Thanks,
David McElroy


David McElroy (1):
  avformat/movenc: fix HEVC fmp4 HLS init segment for Apple playback

 libavformat/movenc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.34.1

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