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• how can i replace two subtitles in a mkv file ?

  30 avril 2020, par Ginso

  i have an mkv file with 2 audio and 4 subtitle streams. the 3rd and 4th subtitle stream contained errors, so i extracted and corrected them, but i don't know how i can replace them in the mkv file. i tried
ffmpeg.exe -i .\video.mkv -map 0:0 -map 0:1 -map 0:2 -map 0:3 -map 0:4 -i sub1.srt -i sub2.srt out.mkv

  



  but this gives me the error :

  



  Option map (set input stream mapping) cannot be applied to input url sub2.srt -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to.
Error parsing options for input file sub2.srt.
Error opening input files: Invalid argument


  



  can anyone tell me the correct command ?

  


• Prevent libavformat (FFmpeg) from adding "ENCODER" tag to output / help stripping the tags

  9 juillet 2021, par Wyatt Ward

  I made a bash script that transfers audio or video metadata from one file to another, regardless of media container format, via FFMpeg. My problem is that FFMpeg consistently adds a 'ENCODER' tag.

  



  Example :

  



  Before running through FFMpeg :

  



   File : track01.cdda.flac

  



    Metadata:
    ALBUM           : Wish You Were Here
    ARTIST          : Pink Floyd
    COPYRIGHT       : 1975 Harvest Records
    DATE            : 1975
    GENRE           : Experimental Rock
    TITLE           : Shine On You Crazy Diamond
    track           : 1


  



  After running through FFMpeg :

  



   File : track01-iphone-alac.m4a

  



    Metadata:
    ALBUM=Wish You Were Here
    ARTIST=Pink Floyd
    COPYRIGHT=1975 Harvest Records
    DATE=1975
    GENRE=Experimental Rock
    TITLE=Shine On You Crazy Diamond
    track=1
    ENCODER=Lavf55.12.100


  



  So really, I want to either force FFMpeg to not add the 'ENCODER' tag, or I want to strip that tag off afterwards. Is there a way to do this ? I really don't want to spend hours trying to compile FFMpeg again on my Pentium 4 HT - the only working computer I have at the moment. I'd prefer not to have to use another program unless it's related enough to FFMpeg or MPlayer/Mencoder that I won't have to install anything new if I have those installed.

  


• FFmpeg truncates untrunc'ed video

  18 mars 2020, par petrpulc

  Background : Colleague's Panasonic consumer camera had issues with high-capacity SD card and yielded two different types of truncated files (mp4 and mdt) with both header and index corrupted. Both were "fixable" with following steps :

  



  

  1. Locate with hex editor the ascii sequence "mdat" in both a truncated and a corresponding known good file. In mp4 the "mdat" is quite deep in the file as it contains some (but bad) headers, the mdt type almost starts with it.

  


  2. Replace everything up to the "mdat" sequence with known good header. BUT this also means that metadata on length are copied over.

  


  3. Run https://github.com/ponchio/untrunc on the file with corrected header (it refused to run on original files).

  


  4. Profit ! VLC plays the file fine, ffprobe shows correct length. BUT ffmpeg encoding stops at the end timecode of the file I taken the known good header from in step 2.

  


  5. A somewhat ugly solution is to recode the file in VLC (video copy seems to be breaking file up again).

  


  



  I am wondering if I overlooked something ; big time. I guess I do, but simple timecode operations on input file do not seem to have any effect at all.

  



  Is there a way to persuade ffmpeg to encode the whole file that ffprobe and VLC see ?

  



  Files may be provided for analysis on personal basis only, sorry.