Opened 16 months ago
#10112 new defect
HLS Demuxer - Live Playlists needlessly re-download initialization segment
Reported by: | John Regan | Owned by: | |
---|---|---|---|
Priority: | normal | Component: | avformat |
Version: | unspecified | Keywords: | HLS hls |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug:
Hi there - I noticed when playing HLS playlists, ffplay (and apps using libavformat) will re-download the initialization segment for each new media segment added to the list. This causes some warnings to appear, and essentially doubles the number of HTTP requests made during a live playlist.
The warning messages are for duplicated MOOV atoms:
[http @ 0x7fc4e8008a40] Opening 'http://127.0.0.1:8080/init.mp4' for reading [hls @ 0x7fc4e8000c80] Opening 'http://127.0.0.1:8080/stream4.m4s' for reading [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc4e80076c0] Found duplicated MOOV Atom. Skipped it [http @ 0x7fc4e8101f40] Opening 'http://127.0.0.1:8080/stream.m3u8' for reading [hls @ 0x7fc4e8000c80] Skip ('#EXT-X-VERSION:7') [http @ 0x7fc4e8008a40] Opening 'http://127.0.0.1:8080/init.mp4' for reading [hls @ 0x7fc4e8000c80] Opening 'http://127.0.0.1:8080/stream5.m4s' for reading [http @ 0x7fc4e8025480] Opening 'http://127.0.0.1:8080/stream6.m4s' for reading [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fc4e80076c0] Found duplicated MOOV Atom. Skipped it
How to reproduce:
% ffmpeg -i http://something-live.example -c:a aac -vn -f hls -hls_segment_type fmp4 /path/to/folder/stream.m3u8 # in another terminal serve /path/to/folder % python -m http.server --directory /path/to/folder 8080 # play the stream % ffplay http://127.0.0.1:8080/stream.m3u8
ffmpeg info from my machine:
ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers built with gcc 12.2.0 (GCC) configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan libavutil 57. 28.100 / 57. 28.100 libavcodec 59. 37.100 / 59. 37.100 libavformat 59. 27.100 / 59. 27.100 libavdevice 59. 7.100 / 59. 7.100 libavfilter 8. 44.100 / 8. 44.100 libswscale 6. 7.100 / 6. 7.100 libswresample 4. 7.100 / 4. 7.100 libpostproc 56. 6.100 / 56. 6.100
Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.
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