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• FFmpeg splitting large files

  1er février 2016, par Yusaf Khaliq

  I need to split a large video file into multiple pieces quickly and without files with errors. The basic idea is, I have a 2GB video file which I want to change to multiple formats. I have read some encoders can not make use of more than 1 core when encoding to a different format. So I had the idea to split the large file (which is very quick) into 4/8 pieces depending on how many cores I have available on individual servers. re-encode each piece to a new format and use these to display video in sequence.

  so

  testfile.mp4

  becomes

  1. testfile_piece_1.mp4
  2. testfile_piece_2.mp4
  3. testfile_piece_3.mp4
  4. testfile_piece_4.mp4

  these can then be individually be converted.

  The solution should not be format specific. However I have found issues with mp4 files.

  I have tried the command below, which works really well and fast but creates files with errors.

  ffmpeg -i testfile.mp4 -ss 00:00:00 -t 00:20:00 -c copy testfile_piece_1.mp4

  When I play the testfile_piece_1.mp4 on VLC it works fine. An issue arises when converting the split file to a different height and width mp4 file. I would get an error similar to "moov atom not found"

  I tried adding -movflags faststart with no luck

  I then came across this library https://code.google.com/archive/p/moovrelocator/ which fixed the moov issue but I would then get an error with regards to aac "Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height"

  The other way of splitting the files is useless but involved re-encoding the file. not too bad for smaller file size but the 2GB file would probably take days to complete.

  Is there a way to split the largr file quickly without producing files with errors ? I have been working on it for days with no luck.

  Console output for comment - FFmpeg splitting large files

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/usr/share/nginx/html/uploads/testfile01.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.36.100
  
    Duration: 00:05:02.08, start: 302.120000, bitrate: 3254 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709)                                  , 1920x1080 [SAR 1:1 DAR 16:9], 3252 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (de                                  fault)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [libx264 @ 0x165ffc0] width not divisible by 2 (853x480)
  
  Output #0, mp4, to '/usr/share/nginx/html/uploads/testfile01_480.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.36.100
  
      Stream #0:0(und): Video: h264, none, q=2-31, 128 kb/s, SAR 2560:2559 DAR 0:0                                  , 25 fps (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc56.41.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters                                   such as bit_rate, rate, width or height

  console output 2

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/usr/share/nginx/html/uploads/testfile.mp4':
  
    Metadata:
  
      major_brand     : dash
  
      minor_version   : 0
  
      compatible_brands: iso6avc1mp41
  
      creation_time   : 2016-01-24 04:26:37
  
    Duration: 01:15:58.08, start: 0.000000, bitrate: 3163 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 3161 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-01-24 04:26:37
  
        handler_name    : VideoHandler
  
  [segment @ 0x1197060] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  Output #0, segment, to '/usr/share/nginx/html/uploads/testfile%02d.mp4':
  
    Metadata:
  
      major_brand     : dash
  
      minor_version   : 0
  
      compatible_brands: iso6avc1mp41
  
      encoder         : Lavf56.36.100
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 3161 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-01-24 04:26:37
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x11512a0] Codec for stream 0 does not use global headers but container format requires global headers

• FFMpeg - Video conversion - .OGG to .MP4

  21 septembre 2018, par Hue Man

  After scouring the net, I can’t find anyone else trying to do this :
  Convert an OGG video format to MP4 video (usualy people are doing this the other way round).
  I have FFMpeg working just fine converting WEBM to MP4 but it just doesn’t seem to like OGG files.
  The official FFMpeg documentation says that it can both Encode AND Decode OGG files but for some reason it isn’t.
  Any ideas ?

• FFMPEG no metadata

  1er décembre 2014, par user2601259

  I am trying to dump all the important info using ffmpeg.exe -i "1.mp4" -f ffmetadata metadata.txt yet all I get is

  ;FFMETADATA1
  
  major_brand=isom
  
  minor_version=1
  
  compatible_brands=isom

  Official documentation gives no clues at all