[FFmpeg-trac] #8703(undetermined:new): Can't enable flac in fMP4 experimental support

FFmpeg trac at avcodec.org
Tue Jun 2 08:18:00 EEST 2020


#8703: Can't enable flac in fMP4 experimental support
-------------------------------------+-------------------------------------
             Reporter:  tomyun       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 There seems no way to produce a fragmented MP4 containing FLAC audio that
 I'd like to test with HLS. ffmpeg keeps suggesting `-strict -2` to enable
 experimental support for flac in MP4, but adding this option didn't make
 any difference.

 How to reproduce:
 {{{
 % wget https://storage.googleapis.com/media-session/flac.mp4

 % ffmpeg -i flac.mp4 -c copy -strict -2 -hls_segment_type fmp4 -hls_flags
 single_file flac.m3u8
 ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
   built with Apple clang version 11.0.3 (clang-1103.0.32.59)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.3_1 --enable-shared
 --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-
 cflags=-fno-stack-check --host-ldflags= --enable-ffplay --enable-gnutls
 --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d
 --enable-libmp3lame --enable-libopus --enable-librubberband --enable-
 libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora
 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp
 --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-
 libfontconfig --enable-libfreetype --enable-frei0r --enable-libass
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox
 --disable-libjack --disable-indev=jack
   libavutil      56. 31.100 / 56. 31.100
   libavcodec     58. 54.100 / 58. 54.100
   libavformat    58. 29.100 / 58. 29.100
   libavdevice    58.  8.100 / 58.  8.100
   libavfilter     7. 57.100 /  7. 57.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  5.100 /  5.  5.100
   libswresample   3.  5.100 /  3.  5.100
   libpostproc    55.  5.100 / 55.  5.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'flac.mp4':
   Metadata:
     major_brand     : iso5
     minor_version   : 512
     compatible_brands: iso6mp41
     encoder         : Lavf57.75.100
   Duration: 00:00:02.74, start: 0.000000, bitrate: 632 kb/s
     Stream #0:0(und): Audio: flac (fLaC / 0x43614C66), 44100 Hz, stereo,
 s32 (24 bit), 629 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
 [hls @ 0x7f829e01b800] Opening 'flac.m4s' for writing
 [mp4 @ 0x7f829f013600] track 0: codec frame size is not set
 [mp4 @ 0x7f829f013600] flac in MP4 support is experimental, add '-strict
 -2' if you want to use it.
 Could not write header for output file #0 (incorrect codec parameters ?):
 Experimental feature
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
     Last message repeated 1 times
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8703>
FFmpeg <https://ffmpeg.org>
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