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• Avoid auto rotating video in HTML

  15 septembre 2016, par hasanghaforian

  I use ffmpeg to convert a 3gp video to MP4. You can see a part of output of ffmpeg here :

  ffmpeg version N-79139-gde1a0d4 Copyright (c) 2000-2016 the FFmpeg developers

  ...

  Input #0, 
  
  
  
  ...
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : ...
  
        handler_name    : VideoHandle
  
        encoder         :                                
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      ...

  I use noautorotate option in below command to avoid auto rotate based on metadata of file and it is successful. Then I tried this HTML code to open converted file in a browser(for example by Google Chrome) :

  <video width="320" height="240" controls="controls">
  
    <source src="../videos/test.mp4" type="video/mp4">
  
  </source></video>

  But when I open that, video shown rotated. How I can solve this problem ? Is there a tag or any other thing to disable autorotate in HTML ?

• Convert swf to mp4

  28 septembre 2016, par Aleksey Kontsevich

  This answer had not helped : Convert compressed swf to mp4, trying to convert swf file.

  ffmpeg output :

  $ ffmpeg -i GTDS_demo_new.swf GTDS_demo_new.mp4
  
  ffmpeg version 2.8.6-1ubuntu2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
  
    configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    WARNING: library configuration mismatch
  
    avcodec     configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [swf @ 0x21cd1e0] Could not find codec parameters for stream 1 (Video: none, none): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, swf, from 'GTDS_demo_new.swf':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
  
      Stream #0:1: Video: none, none, 12 fps, 12 tbr, 12 tbn
  
  File 'GTDS_demo_new.mp4' already exists. Overwrite ? [y/N] y
  
  No decoder for stream #0:1, filtering impossible
  
  Error opening filters!

  Splitting with dump-gnash also does not help : get sound without video after ffmpeg (this answer : http://stackoverflow.com/a/21023110/630169)

• Why ffmpeg rotates video ?

  15 septembre 2016, par hasanghaforian

  I use this code in a bash script to create GIF images from video files :

  ffmpeg -y -ss 3 -t 4 -i $vid \
  
   -vf fps=10,scale=320:-1:flags=lanczos,palettegen palette.png
  
  
  
  ffmpeg -ss 3 -t 4 -i $vid -i palette.png -filter_complex \
  
   "fps=10,scale=320:-1:flags=lanczos[x];[x][1:v]paletteuse" ../gifs/"$i".gif

  But some GIF images are rotated ! While their thumbnails which is created by OS is not rotated. How I can solve this problem ?

  Update :

  Here you can see outputs of commands :

  Generating palette :

  ffmpeg version N-79139-gde1a0d4 Copyright (c) 2000-2016 the FFmpeg developers
  
    ...
  
  Input #0, 
  
  ...
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : ...
  
        handler_name    : VideoHandle
  
        encoder         :                                
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      ...

  Creating GIF using the palette :

  Input #0, 
  
  ...
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2012-01-01 07:47:56
  
        handler_name    : VideoHandle
  
        encoder         :                                
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      ...