Invalid initialization segment with HLS FMP4 encoder

[Jason]

VERSION: ffmpeg version 4.4 + head branch| Windows & Linux

The HLS encoder (used with fmp4 segmenting) began generating invalid initialization segments consisting of 5 boxes (ftyp, moov, sidx, moof, & mdat) with the latest release -- and an invalid first data segment consisting of a single styp box with no data. Subsequent segments after the first are OK.

It appears if the initialization segment has taken over the data from the first segment.

Version 4.3 and the dash encoder generate an initialization segment with a single ftyp and moov box, as expected.

Here is sample command and file that exhibits the behavior:

./ffmpeg.exe -i "​https://carbon-media.accelerator.net/00000000001/4ajEIDZneABc1Uin8Pw163" -y -report -an -codec:v libx264 -b:v 1000k -s 960x540 -hls_time 4 -hls_segment_type fmp4 -hls_playlist_type event -f hls "output.m3u8"

The complete log output / report is attached.

[Carl Eugen Hoyos]

Please test current FFmpeg git head and provide the command line you tested together with the complete, uncut console output and an input file to make this a valid ticket.

[Jason]

Hi Carl. I've attached the full uncut log (run against a build cut from yesterdays HEAD) and included a source in the command line used to recreate the behavior.

[steffend]

Reverting ​https://github.com/FFmpeg/FFmpeg/commit/b5ca8f2c66954614d81579082025f580efc0cffc (coming from ​https://trac.ffmpeg.org/ticket/8636) fixes this issue for me. Possibly fixes the other issue (​https://trac.ffmpeg.org/ticket/9205) too.

You can try this with a simple

git revert b5ca8f2c66954614d81579082025f580efc0cffc

on the latest master branch.

I've come across this when trying to play an HLS-fmp4 stream generated with the latest FFmpeg using ffplay:

ffplay version 4.4 Copyright (c) 2003-2021 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.4_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[hls @ 0x7fc42d05f600] Skip ('#EXT-X-VERSION:7')
[hls @ 0x7fc42d05f600] Opening '7858485ed5a3afab23523f6de39a215e-1.mp4' for reading
[hls @ 0x7fc42d05f600] Opening '7858485ed5a3afab23523f6de39a215e0.mp4' for reading
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc42d80c200] invalid size 0 in stsd
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc42d80c200] error reading header
main.m3u8: Invalid data found when processing input

[Carl Eugen Hoyos]

Fixed by Steven in 59032494e81a1a65c0b960aaae7ec4c2cc9db35a