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• How to convert any format to H264 (html5) video using ffmpeg ? [on hold]

  14 juillet 2013, par kheya

  I am trying to use a single command to convert avi, mov, wmv etc to H264 (HTML5 playback)
  I have command that converted the avi correctly to H264 (created .mp4 file)
  But the same command fails to convert a quicktime mov file.

  I am using the 64bit static built on windows.

  Here is the command I used to convert AVI to H264. This one works.

  for %%a in ("*.avi") do (
  
      ffmpeg -i "%%a" -c:v libx264 -preset slow -crf 20 -c:a libvo_aacenc -b:a 128k "%%~na.mp4"
  
  )

  I am trying this to convert mov to H264 :

  for %%a in ("*.mov") do (
  
      ffmpeg -i "%%a" -vcodec mpeg4 -acodec libvo_aacenc "%%~na.mp4" //fails
  
      ffmpeg -i "%%a" -vcodec libx264 -vprofile high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:480 -threads 0 -acodec libvo_aacenc -b:a 128k "%%~na.mp4" //fails with error )

  Appreciate if you kindly help me.

  EDIT :
  Here is the error :
  [graph 1 input from stream 0:1 @ 0000000002689260] Invalid sample format (null)
  Error opening filters !

  Output of the command :

  ffmpeg -i "file2.mov" -vcodec libx264 -vprofile high -preset slow -b:v 500k -ma
  
  xrate 500k -bufsize 1000k -vf scale=-1:480 -threads 0 -acodec libvo_aacenc -b:a
  
  128k "file2.mp4"
  
  
  
  The system cannot find the drive specified.
  
  ffmpeg version N-54691-g7f4a1fd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 12 2013 16:31:48 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. 39.100 / 52. 39.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 80.101 /  3. 80.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file2.mov':
  
    Metadata:
  
      creation_time   : 1998-11-12 18:28:20
  
    Duration: 00:00:28.60, start: 0.000000, bitrate: 111 kb/s
  
      Stream #0:0(eng): Video: svq1 (SVQ1 / 0x31515653), yuv410p, 160x120, 90 kb/s
  
  , 7.52 fps, 7.50 tbr, 600 tbn, 600 tbc
  
      Metadata:
  
        creation_time   : 1998-11-12 18:28:20
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: qdmc (QDMC / 0x434D4451), 44100 Hz, mono
  
      Metadata:
  
        creation_time   : 1998-11-12 18:28:20
  
        handler_name    : Apple Alias Data Handler
  
  [graph 1 input from stream 0:1 @ 000000000251a080] Invalid sample format (null)
  
  Error opening filters!

• Compiling FFMPEG for android NDK r9d

  17 juillet 2014, par jawad bin zafar

  I am working on a project in which I need to use FFMPEG for video editing. I have a very short time and compiling takes to much time of me. I have search many tutorial on the web and but no one seem to be working. Some have missing configure file some have command which are broken etc.

  My Question is weather it is necessary to compile FFMPEG with you NDK or we can use a precompile library or we can sign a compile library with our NDK signature.

  Any one knows a working step by step guide to compile and use the compile library into your project.

  Thanks

• New Challenges

  14 mars 2013, par silvia

  I finished up at Google last week and am now working at NICTA, an Australian ICT research institute.

  My work with Google was exciting and I learned a lot. I like to think that Google also got a lot out of me – I coded and contributed to some YouTube caption features, I worked on Chrome captions and video controls, and above all I worked on video accessibility for HTML at the W3C.

  I was one of the key authors of the W3C Media Accessibility Requirements document that we created in the Media Accessibility Task Force of the W3C HTML WG. I then went on to help make video accessibility a reality. We created WebVTT and the <track> element and applied it to captions, subtitles, chapters (navigation), video descriptions, and metadata. To satisfy the need for synchronisation of video with other media resources such as sign language video or audio descriptions, we got the MediaController object and the @mediagroup attribute.

  I must say it was a most rewarding time. I learned a lot about being productive at Google, collaborate successfully over the distance, about how the WebKit community works, and about the new way of writing W3C standard (which is more like pseudo-code). As one consequence, I am now a co-editor of the W3C HTML spec and it seems I am also about to become the editor of the WebVTT spec.

  At NICTA my new focus of work is WebRTC. There is both a bit of research and a whole bunch of application development involved. I may even get to do some WebKit development, if we identify any issues with the current implementation. I started a week ago and am already amazed by the amount of work going on in the WebRTC space and the amazing number of open source projects playing around with it. Video conferencing is a new challenge and I look forward to it.