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• ffmpeg change video stream resolution

  10 décembre 2014, par skorpionet

  I have an MKV with a video stream with wrong resolution of 1920x800, but the inside film is 1920x1080 so my main video player, an LG Smart TV, shows a flattened image. I can easily change resolution in container metadata but LG TV ignores this data and read only video stream data.

  First question : only way to change video stream resolution data is scale the video ?

  To scale with ffmpeg I used this command :

  ffmpeg -i input.mkv -map 0 -c:a copy -c:s copy -c:v libx264 -preset slow -crf 17 -vf scale=1920:1080,setdar=16/9 output.mkv

  Now the mkv is fine, my LG TV read it, looks awesome but..... size went from 3,3Gb to 12Gb !!
  Overall bit rate of 3,3Gb video is 2.704 Kbps, 12Gb is 9.829 Kbps. I think that 7000Kbps more are useless, in original video there aren’t info to raise quality.

  Second question : Why this huge size change ? What is my mistake ?

  Best Regards

• Extract files from mpeg video

  28 octobre 2013, par A Dark Divided Gem

  Videos created with Camtasia can be shared on the web by exporting the project for the TechSmith Smart Player. The video is exported in the "H264 - MPEG-4 AVC (part10) (avc1)" codec and the export also includes other custom XML, JavaScript and SWF files used by the TechSmith Smart Player.

  These custom files are also "burnt" into the video itself. For example the contents of the XML file can be viewed when opening the MP4 video in a text editor. This allows other services to only ask for the MP4 file when uploading Camtasia videos.

  Therefore my question is how do you extract text and binary files from a MP4 video file ? For this project I am limited to Java but I am happy to call an external executable as well.

  I tried the "-dump_attachment" option in FFmpeg but that didn't work and I am out of ideas.

  C :\Users\Desktop>ffmpeg -dump_attachment:t "" -i getting-started-project.mp4
  ffmpeg version N-57448-gc78a416 Copyright (c) 2000-2013 the FFmpeg developers
    built on Oct 26 2013 18:08:54 with gcc 4.8.2 (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-libvidstab —enable-libvo-aa
  cenc —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavp
  ack —enable-libx264 —enable-libxavs —enable-libxvid —enable-zlib
    libavutil      52. 47.101 / 52. 47.101
    libavcodec     55. 38.101 / 55. 38.101
    libavformat    55. 19.104 / 55. 19.104
    libavdevice    55.  5.100 / 55.  5.100
    libavfilter     3. 89.100 /  3. 89.100
    libswscale      2.  5.101 /  2.  5.101
    libswresample   0. 17.104 /  0. 17.104
    libpostproc    52.  3.100 / 52.  3.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'getting-started-project.mp4' :
    Metadata :
      major_brand : mp42
      minor_version : 0
      compatible_brands : isommp42
      creation_time : 2013-10-24 15:53:19
      artist :
      description :
      title : Untitled
    Duration : 00:05:41.12, start : 0.000000, bitrate : 314 kb/s
      Stream #0:0(eng) : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 6
  40x360 [SAR 1:1 DAR 16:9], 185 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
      Metadata :
        creation_time : 2013-10-24 15:53:19
        handler_name : Mainconcept MP4 Video Media Handler
      Stream #0:1(eng) : Audio : aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 12
  5 kb/s (default)
      Metadata :
        creation_time : 2013-10-24 15:53:19
        handler_name : Mainconcept MP4 Sound Media Handler
   At least one output file must be specified

  Update : It appears the XML is contained within a custom UUID atom and I just need a way of extracting that.

  Thanks

• movtextdec : Add support for automatic text wrapping

  14 août 2015, par Niklesh

  movtextdec : Add support for automatic text wrapping
  The value of wrap_flag in the Text Wrap Box specifies if the text is to
  
  be wrapped or not. Uses ’end of line wrap’ amongst the wrap styles
  
  supported by ASS if the text is to be wrapped, i.e ; fill as much text
  
  in a line as possible, then break to next line.
  The 3GPP spec has no provision for smart wrapping.
  Signed-off-by : Niklesh <niklesh.lalwani@iitb.ac.in>
  

  • [DH] libavcodec/movtextdec.c