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• Generate a thumbnail image every X seconds

  1er août 2013, par rabotalius

  I'm trying to generate a thumbnail every minute, but i'm getting the following error :

  ffmpeg -i Hung.mp4 -f image2 -vf fps=fps=1/60 img%03d.jpg
  
  
  
  [mjpeg @ 0x2f06da0] bitrate tolerance too small for bitrate
  
  [mjpeg @ 0x2f1b7c0] ff_frame_thread_encoder_init failed
  
  Output #0, image2, to 'img%03d.jpg':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      Stream #0:0(eng): Video: mjpeg, yuvj420p, 1280x536 [SAR 1:1 DAR 160:67], q=2-31, 200 kb/s, 90k tbn, 0.02 tbc
  
      Metadata:
  
        creation_time   : 2013-07-22 00:01:41
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> mjpeg)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

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this isn’t mentioned in the ffmpeg man page, whereas -slang is, which makes me think the -metadata command is maybe outdated or in some other way not as good as -slang.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