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• System.Diagnostics.Process calling FFMPEG fails with international character

  1er septembre 2013, par Petter Brodin

  I'm using System.Diagnostics.Process to launch FFMPEG, and it works as intended on paths that only contain non-special characters.

  string strParam = "C:\myFolder\foo.png";
  
  
  
  Process ffmpeg = new Process();
  
  
  
  ffmpeg.StartInfo.UseShellExecute = false;
  
  ffmpeg.StartInfo.RedirectStandardOutput = true;
  
  
  
  ffmpeg.StartInfo.FileName = Path_FFMPEG;
  
  ffmpeg.StartInfo.Arguments = strParam;
  
  
  
  ffmpeg.Start();
  
  
  
  ffmpeg.WaitForExit();

  The above example works perfectly, but if I use "c :\myFolder\føø.png" I get the following error message :

  Could find no file with path 'C.\myFolder\f├©├©.png'

  This looks like some kind of encoding error, but that's where my ideas stop.

• Processing a video on a webserver [on hold]

  6 septembre 2013, par Django Reinhardt

  A client is interested in applying a Sepia style filter, as well as title cards, to user-uploaded videos on their website. This would obviously be automated on their webserver, and it seems ffmpeg, dvd-slideshow and/or aviDemux are good ways to make this happen.

  Unfortunately, from what I've read, such processing would require a lot of webserver CPU power — far more than the average webserver usually has. How can I practically perform these calculations on a website ?

  Should I just try and go for a beefy dedicated hosting package, or can I rent another server that's more suited to video processing ?

• Pushing data to web-browser while processing input from ffmpeg

  6 septembre 2013, par Stacked

  I want to push output of this directly to the user using PHP/Python :

  wget -qO- "http://my-video-stream-input.url/here" | ffmpeg -i pipe:0 -ab 192000 -acodec libmp3lame -map_metadata -1 -vn 1378457645_myfile.mp3

  The above command takes the input stream and converts on-the-fly it to audio without waiting for full-file to download, this works perfectly at terminal. Now, I need to push the ffmpeg processed output audio to the web-browser, once again on-the-fly without completing the full transcode, like :

  Wget->ffmpeg->Web-browser in real-time

  I tried the below in PHP but this results in 0 byte file-downloads :

  $cmd = "wget -qO- "http://my-video-stream-input.url/here" | ffmpeg -i pipe:0 -ab 192000 -acodec libmp3lame -map_metadata -1 -vn 1378457645_myfile.mp3";
  
  header('Content-type: audio/mpeg');
  
  header("Content-Type: application/octet-stream");
  
  header("Content-Disposition: attachment; filename=\"1378457645_myfile.mp3\"");
  
  passthru($cmd);

  Adding 2>&1 to the $cmd shows downloads a 3.6 KB file with following

    ffmpeg version 0.7.15, Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Feb 22 2013 07:22:31 with gcc 4.4.5
  
    configuration: --enable-libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-libvpx --enable-librtmp --extra-libs=-lgcrypt --disable-altivec --disable-armv5te --disable-armv6 --disable-vis
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
  
    Duration: 00:02:54.75, start: 164.745578, bitrate: N/A
  
      Stream #0.0(und): Audio: aac, 44100 Hz, stereo, s16
  
      Metadata:
  
        creation_time   : 2013-08-30 05:36:13
  
  Output #0, mp3, to '1378458744_myfile.mp3':
  
    Metadata:
  
      TSSE            : Lavf52.111.0
  
      Stream #0.0(und): Audio: libmp3lame, 44100 Hz, stereo, s16, 192 kb/s
  
      Metadata:
  
        creation_time   : 2013-08-30 05:36:13
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  size=     134kB time=00:00:05.69 bitrate= 192.3kbits/s    
  
  size=     263kB time=00:00:11.23 bitrate= 192.1kbits/s    
  
  size=     386kB time=00:00:16.45 bitrate= 192.1kbits/s    
  
  size=     515kB time=00:00:21.96 bitrate= 192.1kbits/s    
  
  size=     637kB time=00:00:27.16 bitrate= 192.1kbits/s    
  
  size=     765kB time=00:00:32.62 bitrate= 192.0kbits/s    
  
  size=     884kB time=00:00:37.69 bitrate= 192.0kbits/s    
  
  size=    1011kB time=00:00:43.12 bitrate= 192.0kbits/s    
  
  size=    1134kB time=00:00:48.37 bitrate= 192.0kbits/s    
  
  size=    1253kB time=00:00:53.47 bitrate= 192.0kbits/s    
  
  size=    1379kB time=00:00:58.82 bitrate= 192.0kbits/s    
  
  size=    1508kB time=00:01:04.31 bitrate= 192.0kbits/s    
  
  size=    1632kB time=00:01:09.64 bitrate= 192.0kbits/s    
  
  size=    1758kB time=00:01:14.99 bitrate= 192.0kbits/s    
  
  size=    1883kB time=00:01:20.35 bitrate= 192.0kbits/s    
  
  size=    2010kB time=00:01:25.76 bitrate= 192.0kbits/s    
  
  size=    2141kB time=00:01:31.35 bitrate= 192.0kbits/s    
  
  size=    2265kB time=00:01:36.65 bitrate= 192.0kbits/s    
  
  size=    2389kB time=00:01:41.92 bitrate= 192.0kbits/s    
  
  size=    2515kB time=00:01:47.31 bitrate= 192.0kbits/s    
  
  size=    2637kB time=00:01:52.50 bitrate= 192.0kbits/s    
  
  size=    2767kB time=00:01:58.04 bitrate= 192.0kbits/s    
  
  size=    2888kB time=00:02:03.21 bitrate= 192.0kbits/s    
  
  size=    3017kB time=00:02:08.70 bitrate= 192.0kbits/s    
  
  size=    3142kB time=00:02:14.06 bitrate= 192.0kbits/s    
  
  size=    3266kB time=00:02:19.33 bitrate= 192.0kbits/s    
  
  size=    3391kB time=00:02:24.66 bitrate= 192.0kbits/s    
  
  size=    3518kB time=00:02:30.07 bitrate= 192.0kbits/s    
  
  size=    3650kB time=00:02:35.71 bitrate= 192.0kbits/s    
  
  size=    3778kB time=00:02:41.20 bitrate= 192.0kbits/s    
  
  size=    3862kB time=00:02:44.78 bitrate= 192.0kbits/s    
  
  video:0kB audio:3862kB global headers:0kB muxing overhead 0.004804%