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this isn’t mentioned in the ffmpeg man page, whereas -slang is, which makes me think the -metadata command is maybe outdated or in some other way not as good as -slang.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

• ffempg editing metadata major_brand

  29 juillet 2013, par circler

  Hello I have an MP4 video, I want to change the creation_time using ffmepg, without changing the rest of metadata. but I am facing some problems..

  The major_brand and more stuff are changed. I want those to be the same. if I put it in ffprobe.exe this is what I see :

      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '6.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp41mp42isom
  
      creation_time   : 2013-03-23 16:25:53
  
    Duration: 00:00:06.55, start: 0.000000, bitrate: 919 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 480x480,
  
  862 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc
  
      Metadata:
  
        creation_time   : 2013-03-23 16:25:53
  
        handler_name    : Core Media Video
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 k
  
  b/s
  
      Metadata:
  
        creation_time   : 2013-03-23 16:25:53
  
        handler_name    : Core Media Audio

  I want to change the creation_time of the video, when I run :

  ffmpeg.exe -i 6.mp4 -metadata creation_time="2013-06-22 15:00:00" -acodec copy -vcodec copy output.mp4

  I get :

  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp41mp42isom
  
      creation_time   : 2013-06-22 15:00:00
  
      encoder         : Lavf55.12.102
  
      Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 480x480, q=
  
  2-31, 862 kb/s, 29.97 fps, 19200 tbn, 600 tbc
  
      Metadata:
  
        creation_time   : 2013-03-23 16:25:53
  
        handler_name    : Core Media Video
  
      Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, 62 kb
  
  /s
  
      Metadata:
  
        creation_time   : 2013-03-23 16:25:53
  
        handler_name    : Core Media Audio
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  194 fps=0.0 q=-1.0 Lsize=     738kB time=00:00:06.61 bitrate= 913.9kbits
  
  /s

  According to the output and because I chose "-acodec copy -vcodec copy" everything should stay the same. But when I run ffprobe for the newly created .mp4 file. Here is the output :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2013-06-22 15:00:00
  
      encoder         : Lavf55.12.102
  
    Duration: 00:00:06.62, start: 0.000000, bitrate: 913 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 480x480,
  
  862 kb/s, 29.97 fps, 30 tbr, 19200 tbn, 38400 tbc
  
      Metadata:
  
        creation_time   : 2013-06-22 15:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 k
  
  b/s
  
      Metadata:
  
        creation_time   : 2013-06-22 15:00:00
  
        handler_name    : SoundHandler

  As you see everything has changed, even though i chose to keep everything the same.

  Please help me on this. Thanks !

• Why audio element currentTime on ffmpeg encoded mp3 file in Chrome browser does not work

  26 juillet 2013, par Peter

  I have an HTML5 audio element :

  <audio preload="auto">
  
      <source src="./Sound/recording.mp3" type="audio/mpeg">
  
  </source></audio>

  and I need to be able to play last 4 seconds from mp3 recording. My javaScript is :

  audio.currentTime = audio.duration-4;
  
  audio.play();

  Works ok in IE10 and Firefox, but Chrome starts playing from a wrong place. The difference between reported audio.currentTime and actual playback position is about 20s. The recording.mp3 is created with ffmpeg :

  ffmpeg -i recording.wav -ab 32k recording.mp3

  It works, when I strip the ID3v2 header from the recording.mp3 (deleting the first couple bytes in the file before the audio data).

  It also works when I compress to ogg. Can somebody point me to the right direction (ffmpeg switches, audio element attributes or whatever) to get it work also in chrome ?

  Thanks in advance

  EDIT :
  the ffmpeg output :

  ffmpeg version N-53528-g160ea26 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on May 27 2013 15:20:09 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 34.100 / 52. 34.100
  
    libavcodec     55. 12.100 / 55. 12.100
  
    libavformat    55.  7.100 / 55.  7.100
  
    libavdevice    55.  1.101 / 55.  1.101
  
    libavfilter     3. 72.100 /  3. 72.100
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [wav @ 0433e840] max_analyze_duration 5000000 reached at 5015510 microseconds
  
  Guessed Channel Layout for  Input Stream #0.0 : mono
  
  Input #0, wav, from 'recording.wav':
  
    Duration: 02:30:07.86, bitrate: 176 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 11025 Hz, mono, s16, 176 kb/s
  
  Output #0, mp3, to 'recording.mp3':
  
    Metadata:
  
      TSSE            : Lavf55.7.100
  
      Stream #0:0: Audio: mp3 (libmp3lame), 11025 Hz, mono, s16p, 32 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le -> libmp3lame)
  
  Press [q] to stop, [?] for help
  
  size=   35188kB time=02:30:07.86 bitrate=  32.0kbits/s
  
  video:0kB audio:35187kB subtitle:0 global headers:0kB muxing overhead 0.000672%