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• How can I concatenate two very different mp3 files(diff bitrate, channels, samplerate, bitdeph) ?

  13 novembre 2019, par lukistar

  As input I get one mp3 file(input.mp3), then I need to split it into two separate parts(done that) and insert between those parts another mp3(second.mp3).

  The problem :
  I tried using every single command for concatenating files, converting them to .ts etc etc.
  But I always get only the sound of the first mp3 file and the sound of the second is lost. I guess I have to transform my mp3 file into the exact same format as the input.mp3(bitrates, sample rates number of channels) file before I can concatenate it to it.

  I could concatenate the two parts of the input.mp3, but no matter what I do I cannot concatenate with second.mp3.

  I am using php with exec and ffmpeg.exe file. Is it possible to code it so no matter the input, I can transform second.mp3 into suitable for concatenating mp3 ?

• FFMpeg - convert all audio streams from MKV to MP4

  9 avril 2020, par Andrew541

  I have MKV file which contains :

  



  Stream #0:0(eng): Video: h264 (High)
Stream #0:1(pol): Audio: ac3
Stream #0:2(eng): Audio: dts (DTS)
Stream #0:3(pol): Subtitle: subrip
Stream #0:4(eng): Subtitle:  hdmv_pgs_subtitle


  



  I would like to omit subtitles (-sn option), copy video and encode audio streams to AAC.

  



  I tried few various command and output file is always the same (2 audio streams but in both sound from first audio stream).

  



  Here are my commands :

  



  ffmpeg -i input.mkv -sn -map 0:a? -map 0:v -c:v copy -c:a? aac output.mp4 
ffmpeg -i input.mkv -sn -map 0 -c:v copy -c:a aac output.mp4 
ffmpeg -i input.mkv -sn -map 0:? -c:v copy -c:a aac output.mp4


  



  Everything almost work but in output file I have 2 audio streams with name (pol) and (eng) but in both is sound from (pol) stream0:1.

  



  What command should I use to convert audio streams in order to achieve two a audio streams where will be pol and eng sound (not pol in both of them). Sometimes input file has only 1 audio stream so to command line should be universal, I guess ffmpeg map with ? character.

  


• Converting variable bitrate on the fly with ffmpeg

  4 septembre 2016, par Łukasz Bezwerchny

  i do cut some video files with either avidemux or virtualdub using directstream copy, some of the files comes with variable bitrate, the problem is that after such cutting my default video cataloging software shows those files lenght as 0:0, i managed to fix this problem with ffmpeg using "-vcodec copy -acodec copy". The output seem to be fine now but i have another problem, these new files have sound problem, on pot player everything is working fine but on mpc and my cataloging software which also plays media sound gets cut off at the half of the movie, for example 2h movie has only 30min of sound. I did look at the using mediainfo software and it shows me something like : video lenght 1:55, audio lenght 32min. I think the problem is the vbr, i did manage to solve this problem by extracting mp3 file from the troublesome video and convert it to 128kb constant bitrate and again merge the video and new audio file and it seems fine. Video and audio match at the whole video lenght. It’s just a bit of tedious to get things done for a big amount of files to fix, is there a parameter that i could use in one command line to do the job in one process, i mean like :
  ffmpeg -i test.avi -vcodec copy -"convert vbr to 128kb" "save to test2.avi" ?