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• FFMPEG batch convert mkv with subtitles hardcode - tv shows [duplicate]

  5 décembre 2017, par Valantis

  This question already has an answer here :

  • When to wrap quotes around a shell variable ?
    
    3 answers
    

  hello i want to convert hardcode mkv files with their subs ( .srt ) for single episode for example i use

  ffmpeg -i video.avi -vf subtitles=subtitle.srt out.avi 

  and its ok.. i want to try if is possible to make a bash batch script to do that on a directory with several mkv’s there..

  i tried with that code but the result of the show is the same with all episodes something i must changed to make it work

  #!/bin/bash
  
  for video in *.mkv
  
  do
  
      base=${video%.mkv}
  
      ffmpeg -i $base.mkv -vf subtitles=$base.el.srt $base-out.mkv
  
  done

  thanks for any help

• Converted mp4 from gif didn't shows in web browser

  16 décembre 2017, par Stojan Kukrika

  I am trying to convert animated GIFs to MP4 files using ffmpeg. Only this convert GIF to MP4 :

    exec('ffmpeg -i ' . $destinationPath . $filename . ' -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" ' . $destinationPath . $newFilename);

  And I can play it in my pc when download it from server, but it’s didn’t want to pay in browser. Browser returns me this error :
  

  After that GIF to MP4 converor I get one image for thumbnail image and that is works fine :

  exec("ffmpeg -i " . $destinationPath . $video . ".mp4 -ss  00:00:01.000 -vframes 1 ".storage_path().$folderNameThumb."/media.png");

  and it’s shows me a valid frame of GIF. Can anybody help me how to fix this problem with video ?

  ffprobe output
  
  ffprobe version 2.8.13 Copyright (c) 2007-2017 the FFmpeg developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16)
  
  configuration:
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101

  Here is what I get from one MP4 file (run ffprobe filename.mp4) :

   Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2mp41
  
  encoder         : Lavf56.40.101
  
  Duration: 00:00:02.16, start: 0.000000, bitrate: 593 kb/s
  
  Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 500x312 [SAR 1:1 DAR 125:78], 589 kb/s, 8.33 fps, 8.33 tbr, 12800 tbn, 25 tbc (default)
  
  Metadata:
  
  handler_name    : VideoHandler

  Because I use Laravel this is method for return media :

  public function getGifImage(Media $media)
  
  {
  
      $path = storage_path() . '/uploads/gif/' . $media->content;
  
      if (file_exists($path)) {
  
          return response()->download($path, null, [], null);
  
      }
  
  }

• Using ffprobe/ffmpeg to extract individual frames and types in playback sequence

  24 janvier 2018, par Hélder

  I am able to extract keyframes using ffmpeg. Something like this that I have been using :

  ffmpeg -i input.mp4 -vf "select='eq(pict_type\,I)" -vsync vfr -qscale:v 2 I-thumbnails-%02d.png -vf "select='eq(pict_type\,B)" -vsync vfr -qscale:v 2 B-thumbnails-%02d.png -vf "select='eq(pict_type\,P)" -vsync vfr -qscale:v 2 P-thumbnails-%02d.png

  Now the issue is, I would like these extracted frames to be in playback sequence, if possible, the way they are extracted should have a timestamp or any way to know that they start in a certain sequence, example, from start to end :

  IBBBIPPB......BI

  but in a way that I can sort the frames in the playback sequence.

  I want to use this to load in python to extract motion vectors but they should all follow certain playback sequence. Any help ?