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• Set a subtitle language using ffmpeg

  19 mars 2017, par Sam

  I tried googling a way to set the language of a subtitle stream with ffmpeg and found the -slang option. So I tried the following command but immediately receive an error :

  ffmpeg -i input.avi -i subs.srt -c:a copy -c:s mov_text -slang eng -c:v libx264 -profile:v high -level:v 4.0 output.mp4
  
  ffmpeg version 1.1 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Jul 18 2013 23:00:53 with Apple clang version 4.0 (tags/Apple/clang-421.0.60) (based on LLVM 3.1svn)

  libavutil 52. 13.100 / 52. 13.100

  libavcodec 54. 86.100 / 54. 86.100

  libavformat 54. 59.106 / 54. 59.106

  libavdevice 54. 3.102 / 54. 3.102

  libavfilter 3. 32.100 / 3. 32.100

  libswscale 2. 1.103 / 2. 1.103

  libswresample 0. 17.102 / 0. 17.102

  libpostproc 52. 2.100 / 52. 2.100

  Unrecognized option ’slang’.

  Error splitting the argument list : Option not found

  After more googling I found another way to do it using the -metadata command :

  ffmpeg -i input.mp4 -i subs.srt -c:a copy -c:v copy -c:s mov_text -metadata:s:s:0 language=eng output.mp4

  And that works absolutely fine. But this isn’t mentioned in the ffmpeg man page, whereas -slang is, which makes me think the -metadata command is maybe outdated or in some other way not as good as -slang.

  1. What is the difference between using the two above methods (-slang vs -metadata) ?
  2. Why did my -slang command give an error ? Have I used it incorrectly ?

• Pipe and regex bash ouput

  13 mars 2013, par Wes

  I'm trying to get the dimensions of a video with ffmpeg. I use the command ffprobe video.mov to get the following data :

  ffprobe version 1.0 Copyright (c) 2007-2012 the FFmpeg developers
  
    built on Jan 14 2013 10:18:07 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.0 --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 59.100 / 54. 59.100
  
    libavformat    54. 29.104 / 54. 29.104
  
    libavdevice    54.  2.101 / 54.  2.101
  
    libavfilter     3. 17.100 /  3. 17.100
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'linebubble.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 0
  
      compatible_brands: qt
  
      creation_time   : 2013-03-12 02:59:34
  
    Duration: 00:00:14.05, start: 0.050000, bitrate: 135 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 502x288 [SAR 1:1 DAR 251:144], 137 kb/s, 7.84 fps, 60 tbr, 6k tbn, 12k tbc
  
      Metadata:
  
        creation_time   : 2013-03-12 02:59:34
  
        handler_name    : Core Media Data Handler

  Now I want to pipe that into a regex to just get 502x288 on the fourth last line.

  I've seen some solutions with python and perl, but I want this to be in plain bash. How would I go about this ?

• Is there any case for a mov and mp4 containers be interchangeable ?

  13 avril 2018, par danielfranca

  The question migh be silly,
  But I got the following situation.

  I have a bunch of MOV video files from some clients, I was going to convert them to MP4 to be able to run on a browser.
  However, when I just tried to open it on the browser it worked fine, both in Firefox and Chrome.

  When I run ffmpeg on one of those files I get fhe following :

  ffmpeg -i MyVideo.mov -hide_banner
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MyVideo.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2011-06-27 19:53:07
  
      Duration: 00:10:10.96, start: 0.000000, bitrate: 10234 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 10103 kb/s, 25 fps, 25 tbr, 2500 tbn, 5k tbc (default)
  
      Metadata:
  
        creation_time   : 2011-06-27 19:53:07
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : H.264
  
     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 126 kb/s (default)
  
      Metadata:
  
        creation_time   : 2011-06-27 19:53:07
  
        handler_name    : Apple Alias Data Handler

  When running ffprobe to check the container I get a bunch of outputs :

  [FORMAT]
  
  format_name=mov,mp4,m4a,3gp,3g2,mj2
  
  [/FORMAT]

  What exactly does this means ? All those containers are interchangeable ?
  If not, why browsers are able to read this file ?

  Firefox version : 59.0.2
  Chrome Version 65.0.3325.181