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• Merge MKV video and MKA audio tracks while keeping subtitles

  10 avril 2018, par aur0n

  I have this situation :

  • file1.mkv (video with two 5.1 tracks and several subtitles)
  • file1.mka (two stereo audio tracks)

  I want to merge the files to a single output that has :

  • 4 audio tracks (the 5.1 original tracks and the other two from the
    MKA file)
  • the subtitles from the MKV

  Here’s the command I’m trying :

  @ffmpeg.exe -i "file1.mkv" -i "file1.mka" -map 1 -map 0 -c:v copy -c:a copy -c:s copy "output.mkv"

  The problem is that output.mkv does indeed have everything, but the tracks from the MKA are mute, and some players even crash when I try to play them. The other two tracks (from original MKV) work just fine.

  Is there something I’m doing wrong ?

• ffmpeg recompressing a mkv file with subtitles without default value, the new file got a default subtitle

  22 novembre 2022, par Tonic8

  on some file i need to recompress files using ffmpeg, i want the encoding on the video, but have all audio and all subtitles just copied with the same properties.

  


  it seems if there are subitile, without default value, in the original mkv file, it will generate the new file with the first subtitle with "default" value.
If the original file had subtitles with already default value, then FFMPEG won't change anything

  


  .\ffmpeg.exe" -nostats -hwaccel cuda -i ".\toto.mkv" -n -c:v h264_nvenc -preset slow -crf 22 -c:a copy -c:s copy -map 0:v -map 0:a -map 0:s? ".\toto_recompressed.mkv"

  


  does my comand line is adding this behaviour, or i missing a paramter ?

  


  i'm expecting to have ffmpeg not touch and simply "copy" the actual subtitles properties without modifying them.

  


• FFMPEG - Automatic Stream Copy Then Encode On Fail

  18 mars 2017, par Waverunner

  I’ve embarked on a mission to get rid of all of my MKV files since the MP4 container works better for me. So to that end, I did some research and wrote a small script that searches my data files for MKVs and stream copies them to MP4. The script works most of the time, but I get the occasional file that fails and since the script deletes the originals, I lose the file completely.

  I’d like to modify the script in two ways :

  (1) Before deleting the original file, check that the converted file is greater than zero.

  (2) If the converted file is zero (failed) then run an FFMPEG command to re-encode the original file using default values utilizing Intel Quick Sync hardware encoding, then delete the original as usual and go on to the next file in the list.

  Here’s what I have so far...

  @ECHO OFF
  
  cls
  
  echo This script automatically converts MKV video files to MP4.
  
  echo.
  
  echo Changing directory to data drive (Z:).
  
  echo.
  
  Z:
  
  echo Retrieving list of MKV files...
  
  echo.
  
  dir /b /s *.mkv > MKV-Files.txt
  
  echo MKV list compiled.
  
  echo.
  
  echo Converting files to MP4...
  
  echo.
  
  FOR /F "delims=;" %%F in (MKV-Files.txt) DO (
  
  echo Converting "%%F"
  
  echo.
  
  C:\FFMPEG\bin\ffmpeg.exe -y -i "%%F" -movflags faststart -codec copy "%%~dF%  %~pF%%~nF.mp4"
  
  echo.
  
  echo Conversion successful.
  
  echo.
  
  echo Deleting "%%F"
  
  echo.
  
  del "%%F" /F 
  
  )
  
  echo Job completed.
  
  echo.
  
  echo Exiting...

  Thanks in advance for your ideas.