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• "Unknown encoder libx264" on Windows [migrated]

  29 novembre 2012, par shampoo

  I'm testing ClipBucket on a Windows XP system, and ClipBucket (open source video share) uses FFmpeg to convert videos. The final command it executes is (i changed it a little to make it compatible with the current FFmpeg) :

  D:\ffmpeg-snapshot-git\ffmpeg\ffmpeg.exe -i C:
  
  \wamp\www\chclip/files/conversion_queue/1352973741c353c.mp4 -f flv -vcodec libx2
  
  64 -pre normal -r 25 -s 426x240 -aspect 1.775 -vf "pad=10:20:30:40:yellow"  -ac
  
  odec libfaac -ab 128000 -ar 22050 C:\wamp\www\chclip/files/videos/13540939451e18
  
  4.flv 2> C:\wamp\www\chclip/files/temp/13540939461c124.tmp 2>&1

  And this is the response I get :

  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Nov 19 2012 16:42:42 with gcc 4.6.2 (GCC)
  
  configuration:
  
  libavutil      52.  8.100 / 52.  8.100
  
  libavcodec     54. 73.100 / 54. 73.100
  
  libavformat    54. 37.100 / 54. 37.100
  
  libavdevice    54.  3.100 / 54.  3.100
  
  libavfilter     3. 23.101 /  3. 23.101
  
  libswscale      2.  1.102 /  2.  1.102
  
  libswresample   0. 16.100 /  0. 16.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\wamp\www\chclip/files/conversion_que
  
  ue/1352973741c353c.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf53.21.0
  
  Duration: 00:00:51.67, start: 0.000000, bitrate: 344 kb/s
  
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 426x240 [
  
  SAR 1:1 DAR 71:40], 308 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc
  
  Metadata:
  
  handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 31
  
  kb/s
  
  Metadata:
  
  handler_name    : SoundHandler
  
  Unknown encoder 'libx264'

  How can I get this libx264 working in Windows ?

• FFmpeg and Android encoding issue

  4 décembre 2012, par brux

  I compiled ffmpeg for Android. The executable works from the device terminal and I can do normal video operations. I am trying to join 2 mpeg files captured using the camera at the command line on the device.

  First I Capture 2 videos using the camera and save to sdcard, one.mpeg and two.mpeg. Then I do :

   ffmpeg -i one.mpeg onenew.mpeg
  
   ffmpeg -i twompg.mpeg twonew.mpeg 

  (if i dont do the above 2 commands then it doesnt work at all)

   cat onenew.mpeg twonew.mpeg > joined.mpeg
  
   ffmpeg -i joined.mpeg -acodec copy -vcodec copy final.mpeg

  The output (final.mpeg) doesnt play on the device but if i copy to my linux desktop it opens up and plays fine. I tested final.mpeg on a 2.3.3 device and a 2.3.6 device.

  Anyone know why the device would fail to play the video file ?

  UPDATE
  My friend tested the video on a device running 3.0, the default player never played the video however 'moboplayer' did, I need it to play on the default player though.

• Android and ffmpeg, x264 bitrate and videosize

  11 décembre 2012, par brux

  I am concatenating two mp4 files by first converting them to mpeg, once I have concatenated the mpegs I want to produce a final larger mp4.

  The following code works fine in order to produce the mpegs

  ffmpeg -i one.mp4 -q:v 2 -vcodec mpeg2video -acodec copy one.mpg
  
  
  
  
  
  
  
  ffmpeg -i two.mp4 -q:v 2 -vcodec mpeg2video -acodec copy two.mpg

  After concatenating these 2 files (using java) I produce the final mp4 like this :

  ffmpeg -i joined.mpg -vcodec libx264 -acodec copy joined.mp4

  The command works and a low quality mp4 is produced since I am not specifying a 'bitrate' or 'videosize' in the MediaRecorder class object.

  Here are the settings I use on my MediaRecorder object when encoding the video in Android

          mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
  
          mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
  
          mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
  
          mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
  
          mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);

  if I add the following two lines in order to increase the bitrate and videosize of one.mp4 and two.mp4 then the resultant mp4's playback fine using the default player on android, but after converting to mpg and then concatenating and then using the above ffmpeg command to encode a new mp4, th resultant joined.mp4 is less quality than the original mp4's are started out with (one.mp4 and two.mp4)

          mediaRecorder.setVideoEncodingBitRate(2000000);
  
          mediaRecorder.setVideoSize(800, 480);

  Do i need to add more parameters to my ffmpeg commands in order to do this successfully ?