[FFmpeg-trac] #9252(avformat:new): [dash muxer] Unplayable (empty) HLS, audio-only, master playlist

[FFmpeg]

#9252: [dash muxer] Unplayable (empty) HLS, audio-only, master playlist
----------------------------------+---------------------------------------
             Reporter:  pszemus   |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  unspecified
             Keywords:  DASH HLS  |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+---------------------------------------
 When using [http://ffmpeg.org/ffmpeg-all.html#dash-2 DASH muxer] to create
 DASH and HLS streams from an audio-only (e.g. mp3) file, consuming only
 one encoding process, the HLS stream is unplayable (DASH stream works OK).

 While writing HLS master playlist,
 [https://github.com/FFmpeg/FFmpeg/blob/n4.4/libavformat/dashenc.c#L1292
 DASH muxer treats all audio streams as an alternative HLS audio tracks]
 for video tracks, and when there's no video tracks the master HLS playlist
 becomes empty:

 {{{
 #EXTM3U
 #EXT-X-VERSION:7
 #EXT-X-MEDIA:TYPE=AUDIO,GROUP-
 ID="group_A1",NAME="audio_0",DEFAULT=YES,URI="media_0.m3u8"
 }}}
 (no chunklists)


 How to reproduce:
 {{{
 $ffmpeg -i https://filesamples.com/samples/audio/mp3/sample3.mp3 -c:a aac
 -use_timeline 1 -use_template 1 -adaptation_sets "id=0,streams=a"
 -hls_playlist 1 -f dash /tmp/dash/manifest.mpd
 ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
   built with gcc 11 (GCC)
   configuration: --prefix=/usr --bindir=/usr/bin
 --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg
 --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man
 --arch=x86_64 --optflags='-O2 -flto=auto -ffat-lto-objects -fexceptions -g
 -grecord-gcc-switches -pipe -Wall -Werror=format-security
 -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
 -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
 --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now
 -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags='
 -I/usr/include/rav1e' --enable-libopencore-amrnb --enable-libopencore-
 amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-
 crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-
 gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass
 --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack
 --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-
 libmp3lame --enable-libmysofa --enable-nvenc --enable-openal --enable-
 opencl --enable-opengl --enable-libopenjpeg --enable-libopenmpt --enable-
 libopus --enable-libpulse --enable-librsvg --enable-librav1e --enable-
 libsmbclient --enable-version3 --enable-libsoxr --enable-libspeex
 --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora
 --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf
 --enable-version3 --enable-vapoursynth --enable-libvpx --enable-vulkan
 --enable-libglslang --enable-libx264 --enable-libx265 --enable-libxvid
 --enable-libxml2 --enable-libzimg --enable-libzvbi --enable-lv2 --enable-
 avfilter --enable-avresample --enable-libmodplug --enable-postproc
 --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-
 debug --disable-stripping --shlibdir=/usr/lib64 --enable-lto --enable-
 libmfx --enable-runtime-cpudetect
   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
 [mp3 @ 0x55599eb0acc0] invalid concatenated file detected - using bitrate
 for duration
 Input #0, mp3, from
 'https://filesamples.com/samples/audio/mp3/sample3.mp3':
   Metadata:
     encoder         : Lavf57.83.100
   Duration: N/A, start: 0.025057, bitrate: 128 kb/s
   Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
     Metadata:
       encoder         : Lavc57.10
 Stream mapping:
   Stream #0:0 -> #0:0 (mp3 (mp3float) -> aac (native))
 Press [q] to stop, [?] for help
 [dash @ 0x55599f110500] Opening '/tmp/dash/init-stream0.m4s' for writing
 Output #0, dash, to '/tmp/dash/manifest.mpd':
   Metadata:
     encoder         : Lavf58.76.100
   Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s
     Metadata:
       encoder         : Lavc58.134.100 aac
 [dash @ 0x55599f110500] Opening '/tmp/dash/chunk-stream0-00001.m4s.tmp'
 for writing
 [dash @ 0x55599f110500] Opening '/tmp/dash/manifest.mpd.tmp' for writing
 [dash @ 0x55599f110500] Opening '/tmp/dash/media_0.m3u8.tmp' for writing
 [dash @ 0x55599f110500] Opening '/tmp/dash/master.m3u8.tmp' for writing
 [...]
 [dash @ 0x55599f110500] Opening '/tmp/dash/chunk-stream0-00022.m4s.tmp'
 for writing
 [dash @ 0x55599f110500] Opening '/tmp/dash/manifest.mpd.tmp' for writing
 [dash @ 0x55599f110500] Opening '/tmp/dash/media_0.m3u8.tmp' for writing
 size=N/A time=00:01:45.79 bitrate=N/A speed= 114x
 video:0kB audio:1667kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 [aac @ 0x55599ebce0c0] Qavg: 207.240


 $ cat /tmp/dash/master.m3u8
 #EXTM3U
 #EXT-X-VERSION:7
 #EXT-X-MEDIA:TYPE=AUDIO,GROUP-
 ID="group_A1",NAME="audio_0",DEFAULT=YES,URI="media_0.m3u8"


 $ mpv /tmp/dash/master.m3u8
 Empty playlist!

 Exiting... (End of file)
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9252>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker