[FFmpeg-trac] #9168(ffmpeg:new): cant combine flac files with uncommon metadata

[FFmpeg]

#9168: cant combine flac files with uncommon metadata
---------------------------------+---------------------------------------
             Reporter:  martinb  |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  ffmpeg   |                  Version:  unspecified
             Keywords:  bug      |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+---------------------------------------
 Hello, I am on ffmpeg version 4.3, trying to combine two flac files into
 one mp3 file (keeping as much quality as possible). My two flac files are
 here:
 https://www.mediafire.com/folder/0v9hbfrap727y/broken+flac

 If I try to combine them with this command:
 {{{
 ffmpeg.exe -i "G:\RenderTune broken files\broken flac example\05 - Billy
 Martin - Phillie Dog.flac" -i "G:\RenderTune broken files\broken flac
 example\08 - Billy Martin - Stax.flac" -y -filter_complex
 concat=n=2:v=0:a=1 -c:a libmp3lame -b:a 320k "G:\RenderTune broken
 files\broken flac example\COMBINED_FILES.mp3"
 }}}

 I get a conversion failed error message:
 {{{
 [mjpeg @ 0000022537ace640] bits 85 is invalid
 Error while decoding stream #0:1: Invalid data found when processing input
 Too many packets buffered for output stream 0:0.
 [libmp3lame @ 0000022537ac3480] 3 frames left in the queue on closing
 Conversion failed!
 }}}

 If I use this same command with two other flac files it works fine:
 {{{
 ffmpeg.exe -i "G:\RenderTune broken files\working flac example\5.
 Gossip.flac" -i "G:\RenderTune broken files\working flac example\6. Let
 The Children Play.flac" -y -filter_complex concat=n=2:v=0:a=1 -c:a
 libmp3lame -b:a 320k "G:\RenderTune broken files\working flac
 example\COMBINED_FILES.mp3"
 }}}

 So there is something with the metadata in my two broken flac files by
 Billy Martin that cause my ffmpeg command to fail, but I can still use the
 'broken' flac files and listen to them fine so its not like they're too
 horribly corrupted.

 I have tried adding {{{  -max_muxing_queue_size 9999  }}} to the command
 but it didn't make a difference, I also tried adding an output mapping to
 my command like so:

 {{{
 ffmpeg.exe -y -i "G:\RenderTune broken files\working flac example\5.
 Gossip.flac" -i "G:\RenderTune broken files\working flac example\6. Let
 The Children Play.flac" -filter_complex "[0:a][1:a]concat=n=2:v=0:a=1[a]"
 -map "[a]" -c:a libmp3lame -b:a 320k "G:\RenderTune broken files\working
 flac example\COMBINED_FILES.mp3"
 }}}

 But it caused a different error:
 {{{
 [libmp3lame @ 000002453725f3c0] Queue input is backward in time.9x
 ... lots of these [mp3 @ ..] messages
 [mp3 @ 0000024537344400] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 2449071 >= 2445999
 [mp3 @ 0000024537344400] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 2449071 >= 2447151
 [mp3 @ 0000024537344400] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 2449071 >= 2448303
 [flac @ 00000245372d4140] invalid residual315.7kbits/s speed=59.7x
 [flac @ 00000245372d4140] decode_frame() failed
 Error while decoding stream #1:0: Invalid data found when processing input
 size=   24871kB time=00:10:37.09 bitrate= 319.8kbits/s speed=60.5x
 video:0kB audio:24869kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.004673%
 }}}

 Is there any way I can sanitize my flac files so my ffmpeg command works?
 Or some way to edit my ffmpeg command to work with my two 'broken' flac
 files? Thanks

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Ticket URL: <https://trac.ffmpeg.org/ticket/9168>
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