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• Multiple video sources combined into one

  28 septembre 2011, par Oded

  I am looking for an efficient way to do the following :

  Using several source videos (of approximately the same length), I need to generate an output video that is composed of all of the original sources each running in its own area (like a bunch of PIPs in several different sizes). So, the end result is that all the original are running side-by-side, each in its own area/box.

  The source and output need to be flv and the platform I am using is Windows (dev on Windows 7 64bit, deployment to Windows server 2008).

  I have looked at avisynth but unfortunately it can't handle flv and non of the plugins and flv splitters I have tried worked.

  My current process uses ffmpeg in the following manner :

  1. Use ffmpeg to generate 25 png's per second per video, resizing the original as needed.
  2. Use the System.Drawing namespace to combine each set of frames into a new image, starting with a static background, then loading each frame into an Image and drawing to the background Graphics object - this gives me the combined frames.
  3. Use ffmpeg to combine the generated images to a video.

  All this is very IO intensive (which is my processing bottleneck at the moment) and I feel there must be a more efficient way to reach my goal. I do not have much experience with video processing, and don't know what options are out there.

  Can anyone suggest a more efficient way of processing these ?

• FFmpeg not encoding with libx264 library

  29 octobre 2011, par bOkeifus

  Hey people of StackOverflow. I have been having a strange issue that I'm not exactly sure what's going on. I am using FFmpeg to convert any incoming video files to h264 mp4 files using the libx264. This is the log that I get from running this line of code :

  ffmpeg -y -i vdoname.flv -acodec libfaac -vcodec libx264 -sameq vid.mp4

  This is the log output after running the line :

  FFmpeg version SVN-r13428, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  
    configuration: --prefix=/usr --disable-static --enable-shared --enable-gpl --enable-nonfree --enable-pthreads --enable-liba52 --enable-liba52bin --enable-libamr-nb --enable-libamr-wb --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --disable-network --disable-ipv6 --disable-ffserver --disable-ffplay
  
    libavutil version: 49.6.0
  
    libavcodec version: 51.57.0
  
    libavformat version: 52.14.0
  
    libavdevice version: 52.0.0
  
    built on Feb 17 2009 09:01:13, gcc: 4.1.2 20071124 (Red Hat 4.1.2-42)
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 49.92 (599/12)
  
  Input #0, flv, from '/html/video/937.flv':
  
    Duration: 00:00:10.08, start: 0.000000, bitrate: 48 kb/s
  
      Stream #0.0: Video: flv, yuv420p, 720x480, 49.92 tb(r)
  
      Stream #0.1: Audio: mp3, 22050 Hz, stereo, 48 kb/s
  
  Output #0, h264, to '/html/flvideo/new_937.mp4':
  
      Stream #0.0: Video: libx264, yuv420p, 720x480, q=2-31, 200 kb/s, 49.92 tb(c)
  
      Stream #0.1: Audio: libfaac, 22050 Hz, stereo, 64 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  [libx264 @ 0x11d58b0]using cpu capabilities: MMX MMXEXT SSE SSE2 3DNow!
  
  Press [q] to stop encoding

  Can someone please help me out and tell me what to do to get this to work ? I guessed that the libx264 external library is not installed but it doesn't exactly say that in the log file and it looks as if it does find it but then doesn't actually encode the video.

  Any and all help is greatly appreciated.

• FFmpeg can 'encode' to mp3, but will not accept an 'input' mp3

  21 novembre 2011, par Jonathan Coe

  FYI : Fedora 8 running on Amazon EC2...

  Having a difficult time with FFmpeg doing a (what should be pretty simple) conversion. I can get FFmpeg to encode an mp3 file from an m4a file using the following :

  ffmpeg -i file1.m4a -acodec libmp3lame -ab 160k file2.mp3

  However, I cannot get it to to convert an mp3 -> mp3, it responds with "Unknown Format" using the following :

  ffmpeg -i file1.mp3 -acodec libmp3lame -ab 160k file2.mp3

  I get the following command string :

  FFmpeg version UNKNOWN, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  
  
  
  
  
  configuration: --prefix=/usr --libdir=/usr/lib --shlibdir=/usr/lib --mandir=/usr/share/man --incdir=/usr/include/ffmpeg --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaad --enable-libfaac --enable-libgsm --enable-libxvid --enable-libx264 --enable-liba52 --enable-liba52bin --enable-pp --enable-shared --enable-pthreads --enable-gpl --disable-strip
  
    libavutil version: 49.6.0
  
    libavcodec version: 51.50.1
  
    libavformat version: 52.7.0
  
    libavdevice version: 52.0.0
  
    built on Feb 14 2008 17:47:08, gcc: 4.1.2 20070925 (Red Hat 4.1.2-33)
  
  file1.mp3: Unknown format

  Any help would be hugely appreciated !

  Edit for clarity :
  The input file is in /ebs/queue/input.mp3 and the output is /ebs/converted/output.mp3