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• avconv : fix -frames for video encoders with delay.

  2 janvier 2012, par Anton Khirnov

  avconv : fix -frames for video encoders with delay.

• Video recoding with ffmpeg

  8 novembre 2011, par Aleks G

  I asked in another question (http://stackoverflow.com/questions/8012494/sorry-this-video-cannot-be-played-streaming-mp4-to-android/8012874#8012874) about video playback in android using VideoView. Apparently, the problem there is due to the way my video is encoded, as another video (512Kb mp4 off the web) plays correctly using my code. As videos are uploaded by my end users to the web site, I don't have any control of the videos themselves, however I do have control over re-coding these. I re-code them using ffmpeg to bring them to a standard MP4 (H.264+AAC) format and scale them to the same size (320x240).

  Here's the ffmpeg info of a video that would not play :

  sh-3.2$ ffmpeg -i video.bad.mp4
  
  FFmpeg version SVN-r25679-snapshot, Copyright (c) 2000-2010 the FFmpeg developers
  
    built on Nov  5 2010 09:34:37 with gcc 4.3.2
  
    configuration: --prefix=/usr --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-libgsm --enable-x11grab --enable-libx264 --enable-libtheora --extra-cflags=-Wall --enable-swscale --enable-libdc1394 --enable-nonfree --disable-mmx --disable-stripping --enable-avfilter --disable-altivec --disable-armv5te --disable-armv6 --disable-vis --enable-nonfree --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3
  
    libavutil     50.32. 6 / 50.32. 6
  
    libavcore      0.12. 0 /  0.12. 0
  
    libavcodec    52.94. 3 / 52.94. 3
  
    libavformat   52.84. 0 / 52.84. 0
  
    libavdevice   52. 2. 2 / 52. 2. 2
  
    libavfilter    1.56. 0 /  1.56. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.bad.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf52.84.0
  
    Duration: 00:00:45.93, start: 0.000000, bitrate: 591 kb/s
  
      Stream #0.0(und): Video: h264, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 535 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc
  
      Stream #0.1(und): Audio: aac, 48000 Hz, stereo, s16, 51 kb/s

  And here's the ffmpeg info of a video that plays correctly :

  sh-3.2$ ffmpeg -i video.mp4
  
  FFmpeg version SVN-r25679-snapshot, Copyright (c) 2000-2010 the FFmpeg developers
  
    built on Nov  5 2010 09:34:37 with gcc 4.3.2
  
    configuration: --prefix=/usr --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-libgsm --enable-x11grab --enable-libx264 --enable-libtheora --extra-cflags=-Wall --enable-swscale --enable-libdc1394 --enable-nonfree --disable-mmx --disable-stripping --enable-avfilter --disable-altivec --disable-armv5te --disable-armv6 --disable-vis --enable-nonfree --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3
  
    libavutil     50.32. 6 / 50.32. 6
  
    libavcore      0.12. 0 /  0.12. 0
  
    libavcodec    52.94. 3 / 52.94. 3
  
    libavformat   52.84. 0 / 52.84. 0
  
    libavdevice   52. 2. 2 / 52. 2. 2
  
    libavfilter    1.56. 0 /  1.56. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      title           : crazytown - http://www.archive.org/details/Cartoon-Crazytown
  
      encoder         : Lavf51.10.0
  
    Duration: 00:07:50.40, start: 0.000000, bitrate: 578 kb/s
  
      Stream #0.0(und): Video: h264, yuv420p, 320x240, 510 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Stream #0.1(und): Audio: aac, 48000 Hz, stereo, s16, 63 kb/s

  I have two questions here, actually. First, which of the details in my "bad" video does android not like ? And, second, what parameters should I use with ffmpeg to recode my videos ? As present I use this :

  ffmpeg -i $input_video_file -y -s 320x240 -vcodec libx264 -vpre medium -acodec libfaac -b 510K -ar 48000 -aspect 4:3 $tmpfile.mp4
  
  qt-faststart $tmpfile.mp4 $output_video_file.mp4

  But this produces a video that's not playable on android. Any help is greatly appreciated.

• First Capturing thumbnail from a Video using php ?

  28 juillet 2012, par Ajay

  I have an upload functionality on my site. And i want the php script to take out a random frame from the uploaded video, and save it as an image. Is that possible ?please guide me how can i get first capture image in video upload in php

  Thanks for Advance.