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• ffmpeg fails with a wall of red hex output but only when in a bash loop

  5 septembre 2018, par jozxyqk

  Similar question here, but no solution : https://www.reddit.com/r/linuxquestions/comments/m00f0/hex_output_from_ffmpeg_when_run_in_a_loop/

  I’m trying to batch encode some video. I have a list of filenames in a text file and read each one in a bash loop. This is it :

  OUT=./out
  
  mkdir -p $OUT
  
  
  
  while read inputfile; do
  
  b=$(basename "$inputfile")
  
  outputfile="$OUT/$b"
  
  echo
  
  echo
  
  echo "$inputfile"
  
  echo "$outputfile"
  
  echo
  
  ffmpeg -i "$inputfile" "$outputfile" || exit
  
  done < files.txt

  When I run it, the ffmpeg command seems to start OK, then spits out a massive wall of red hex dump like text (as below). It does finish without error, but the file is only a few hundred frames long.

  [libx264 @ 0x1b68d60] frame= 537 QP=31.44 NAL=0 Slice:B Poc:70  I:2    P:239  SKIP:987  size=516 bytes
  
  stream #1:                                                                                                                                                
  
    keyframe=1                                                                                                                                              
  
    duration=0.024                                                                                                                                          
  
    dts=25.992  pts=25.992                                                                                                                                  
  
    size=336                                                                                                                                                
  
  00000000  ff fb 84 64 1a 0e d3 21 3f d4 93 18 6a e6 33 a4 ...d...!?...j.3.
  
  00000010  6a 63 25 22 4a 0c d1 1d 52 6c bd ab c0 bf 23 69 jc%"J...Rl....#i
  
  ... LOTS MORE

  The other really weird thing is that the next inputfile in the bash loop is broken and has only the last few characters, which does not happen if I simply comment out the ffmpeg line.

  What could ffmpeg be doing to interfere with the bash loop like this ?

  (ffmpeg 2.8.6, bash 4.3.42(1), fedora 23)

• ffmpeg fails with a wall of red hex output but only when in a bash loop

  2 avril 2016, par jozxyqk

  Similar question here, but no solution : https://www.reddit.com/r/linuxquestions/comments/m00f0/hex_output_from_ffmpeg_when_run_in_a_loop/

  I’m trying to batch encode some video. I have a list of filenames in a text file and read each one in a bash loop. This is it :

  OUT=./out
  
  mkdir -p $OUT
  
  
  
  while read inputfile; do
  
  b=$(basename "$inputfile")
  
  outputfile="$OUT/$b"
  
  echo
  
  echo
  
  echo "$inputfile"
  
  echo "$outputfile"
  
  echo
  
  ffmpeg -i "$inputfile" "$outputfile" || exit
  
  done < files.txt

  When I run it, the ffmpeg command seems to start OK, then spits out a massive wall of red hex dump like text (as below). It does finish without error, but the file is only a few hundred frames long.

  [libx264 @ 0x1b68d60] frame= 537 QP=31.44 NAL=0 Slice:B Poc:70  I:2    P:239  SKIP:987  size=516 bytes
  
  stream #1:                                                                                                                                                
  
    keyframe=1                                                                                                                                              
  
    duration=0.024                                                                                                                                          
  
    dts=25.992  pts=25.992                                                                                                                                  
  
    size=336                                                                                                                                                
  
  00000000  ff fb 84 64 1a 0e d3 21 3f d4 93 18 6a e6 33 a4 ...d...!?...j.3.
  
  00000010  6a 63 25 22 4a 0c d1 1d 52 6c bd ab c0 bf 23 69 jc%"J...Rl....#i
  
  ... LOTS MORE

  The other really weird thing is that the next inputfile in the bash loop is broken and has only the last few characters, which does not happen if I simply comment out the ffmpeg line.

  What could ffmpeg be doing to interfere with the bash loop like this ?

  (ffmpeg 2.8.6, bash 4.3.42(1), fedora 23)

• Value in a const global structure changed [closed]

  9 juillet 2023, par codeconscious

  I have a weird problem, I am compiling FFmpeg for an arm64 target and it is crashing due to what seems like a global buffer overflow. I have localized the culprit to something very odd.

  


  There's a structure in FFmpeg :

  


  static const AVClass codec2_mux_class = {
    .class_name = "codec2 muxer",
    .item_name  = av_default_item_name,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_DEMUXER, // the value is 4
};



  


  so even though this is a static const, when accessing it the .category element is not 4 when it should be and the last element of the structure which is not initialized is not NULL, but interestingly points to the next structure (which is right under it in the codec2.c).

  


  Any clue what could be going on here ?

  


  Also since this is static const I thought this would be put in data.ro and from the objdump this does indeed seem to be the case. But the value still somehow manages to get changed in the global structure ?

  


  Notes :

  


  The structure is defined in this : https://github.com/FFmpeg/FFmpeg/blob/master/libavutil/log.h#L66