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• libavcodec : Set hidden visibility on global symbols accessed from AArch64 assembly

  11 juillet 2022, par Martin Storsjö

  libavcodec : Set hidden visibility on global symbols accessed from AArch64 assembly
  The AArch64 assembly accesses those symbols directly, without
  
  indirection via e.g. the GOT on ELF. In order for this not to
  
  require text relocations, those symbols need to be resolved fully
  
  at link time, i.e. those symbols can't be interposable.
  Normally, so far, this is achieved when linking shared libraries
  
  in two ways ; we have a version script (libavcodec/libavcodec.v) which
  
  marks all symbols that don't start with av* as local. Additionally,
  
  we try to add -Wl,-Bsymbolic to the linker options if supported,
  
  making sure that such symbol references are resolved fully at link
  
  time, instead of making them interposable.
  When the libavcodec static library is linked into another shared
  
  library, there's no guarantee that it uses similar options (even though
  
  that would be favourable), which would end up requiring text relocations
  
  in the AArch64 assembly.
  Explicitly mark the symbols that are accessed from AArch64 assembly
  
  as hidden, so that they are resolved fully at link time even without
  
  the version script and -Wl,-Bsymbolic.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aacsbrdata.h
  • [DH] libavcodec/fft.h
  • [DH] libavcodec/vp9dsp.h
  • [DH] libavutil/attributes_internal.h

• FFMPEG mp3 file segmentation on Mac OSx Error . Only one full mp3 file generated as segmented file

  2 novembre 2017, par iThirst

  What I am trying to achieve is to take an MP3 file as source file and generate multiple segments of approx 10s each from it. I am using node’s fluent ffmpeg inside node js application. Below code works absolutely fine and generates proper results on Linux/Ubuntu 16.04 server while fails with below error on mac osx. It ends by generating single .mp3 file and .m3u8 playlist file on mac osx while it generates multiple segmented mp3 files (each 11s) if executed on ubuntu server.

  Error Log: 
  
  [mp3 @ 0x7fc469010c00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 9223372036854422218 >= -9223372033278215478
  
  [segment @ 0x7fc469006a00] Packets poorly interleaved, failed to avoid negative timestamp -9223372033277846838 in stream 0.

  // Node js code to execute ffmpeg command is given below

  var command = ffmpeg(fs.createReadStream(directoryPath + fileName), {timeout : 900})
  
                      .inputFormat('mp3')
  
                      .inputOptions([                    
  
                          //'-re',
  
                          //'-i input.mp3',
  
                          //directoryPath +'albumart.jpg',
  
                          '-codec copy',
  
                          '-map 0',
  
                          '-f segment',
  
                          '-segment_list ' + directoryPath + fileName_noExtension + '.m3u8',
  
                          '-segment_list_flags +live',
  
                          '-segment_time 10',
  
                           directoryPath + 'out%03d.mp3'
  
                      ]);
  
   command.on('start',{}).on('stderror').on('end').output(directoryPath +  'Out.mp3')
  
          .run()

  //

  Any help is appreciated in this direction.

• Batch file to add separate audio file to MP4 file [closed]

  30 janvier 2021, par MrRoso

  I have a couple of video files (MP4) with audio in France.
Video1.mp4, Video2.mp4, Video3.mp4, ……
In the same directory, I have the same couple of audio files in English (m4a).
Audio1.m4a, Audio2.m4a, Audio3.m4a, ……

  


  The command

  


  ffmpeg -i "Video1.mp4" -i "Audio1m4a" -map 0 -map 1:a -c copy "Out.mp4"


  


  to add the audio file to the Video file works fine, but I need to do this for each video and audio file manually.

  


  I want to do this in a batch file, like this :

  


  @Echo off
for %%i in (*.MP4) %%j in (*.m4a) do ffmpeg -i "%%i" -i "%%j" -map 0 -map 1:a -codec copy "/new/%%~nI.mp4"


  


  But I get the follow error message :
"% j" cannot be processed syntactically at this point.

  


  Also the new batch file ends in an error :

  


  @Echo off
for /F tokens=i,j %%i in (*.MP4) %%j in (*.m4a) do ffmpeg -i "%%i" -i "%%j" -map 0 -map 1:a -codec  copy "/new/%%~nI.mp4"


  


  Error Message :
"i" cannot be processed syntactically at this point.

  


  Has someone a batch file for me, which is working ?

  


  Best regards