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• Create Video Thumbnail of All Files in a Directory via FFmpeg and PHP

  2 février 2012, par Hashid Hameed

  I have searched all over the Google and StackOverFlow, but still did not find a solution for this.

  I want to generate video thumbnail of all mp4 video files in a directory and name the thumbnails as "filename.mp4".jpg

  I have ffmpeg and ffmpeg-php installed on my server. I also succeeded in creating thumbnails of one file at a time.

  So this is the situation, I have a directory named uploads which has lots of mp4 videos.
  Now, when I run the script, thumbnail of size 100x100 shoud be created automatically and placed in another folder "skrin". Eg : xxx.mp4 should have xxx.mp4.jpg has the thumb name.

  IMPORTANT : My filenames have spaces, single quotes, brackets etc in their file names. So the script should be able to handle this.

  Could some one help me ? I use the following shell command in php using exec to generate thumb of an individual video.

  exec("/usr/local/bin/ffmpeg -itsoffset -105 -i 'xxx haha.mp4' -vcodec mjpeg -vframes 1 -an -f rawvideo -s 100x100 'xxx haha.mp4.jpg'");

• Audio stream shorter than video stream

  2 février 2012, par JackWilson

  I generate a bunch of videos by looping .PNG inputs along with .AMR audio.

  ffmpeg -loop 1 -i slide001.png -i slide001.amr -vcodec rawvideo -acodec pcm_s16le -t 5 slide001.avi

  Eventually I join the .AVIs using Mencoder. I haven't had much success trying to join them with FFmpeg.

  It seems that because the .AMR's actual duration is shorter than the 5 seconds I specified for example, when the time comes to join the .AVIs, the audio stream will be out of sync (ahead of the video).

  I suspect I need to find a way of padding the audio with silence or specifying its duration somehow so that the audio and video streams in my .AVIs are of equal length before joining them.

  Any ideas ?

  Thanks.

• Perl FFMpeg print output

  31 janvier 2012, par user346443

  Hi im using the following perl command to convert files with ffmpeg :

  system ("/usr/local/bin/ffmpeg -i $inputFile $outputFile");

  I would like to know if its possible to print the ffmpeg output ?

  Cheers

  UPDATE

  The solution was to use backticks

  my $output = qx{/usr/local/bin/ffmpeg -i $inputFile $outputFile 2>&1};
  
  print $output

  This prints out the following :

  FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers built on Jan 31 2012 12:30:35 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6) configuration: --enable-libmp3lame --disable-mmx --enable-shared libavutil 50.36. 0 / 50.36. 0 libavcore 0.16. 1 / 0.16. 1 libavcodec 52.108. 0 / 52.108. 0 libavformat 52.93. 0 / 52.93. 0 libavdevice 52. 2. 3 / 52. 2. 3 libavfilter 1.74. 0 / 1.74. 0 libswscale 0.12. 0 / 0.12. 0 [wav @ 0x8af94c0] max_analyze_duration reached Input #0, wav, from 'a.wav': Duration: 00:00:05.84, bitrate: 1537 kb/s Stream #0.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s Output #0, mp3, to 'a.mp3': Metadata: TSSE : Lavf52.93.0 Stream #0.0: Audio: libmp3lame, 48000 Hz, 2 channels, s16, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Press [q] to stop encoding size= 42kB time=5.42 bitrate= 64.0kbits/s size= 46kB time=5.88 bitrate= 64.0kbits/s video:0kB audio:46kB global headers:0kB muxing overhead 0.070153%