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• how do I fix the permission problem so ffmpeg can write when run from a cgi-script ?

  7 juillet 2022, par NewtownGuy

  I have a shell script in Linux that runs ffmpeg for the purpose of converting video to a series snapshots in response to a command from apache2. The shell script is run from a perl script in /var/www/cgi-bin that is called by apache2. The conversion works fine when I run the shell script from the command line when I login as root. The problem is that ffmpeg cannot write its output when it's run from the cgi-script. With the exception of ffmpeg writing files, the shell script runs from the cgi-script just fine because I enabled it in /etc/sudoers and I run it with sudo. I have read several posts on the use of ffmpeg and setting permissions, and have tried the following without success :

  


  


  1. The full path to the snapshot files being written is given in the ffmpeg command

     


  


  2. I tried placing the shell script that runs ffmpeg into a root folder instead of the same folder, /var/www/cgi-bin, as the perl cgi script

     


  


  3. I gave the folder, /var/www/html/userName/video, where ffmpeg is to write its snapshots, www-data:root ownership instead of the original root:root, and I tried changing its write permission from 755 to 777.

     


  


  4. ffmpeg is installed in the default location, /use/bin

     


  


  


  How do I fix this ?

  


  Thank you in advance.

  


• Changing container from mkv to m2v - audio doesn't transfer

  31 août 2014, par thornomad

  Am converting a DVD extraction from an MKV container to an MPEG2 file. This is the command I am using :

  ffmpeg -i title04.mkv -c:v copy -c:a copy title04.m2v

  It creates the file but with no audio. Am not sure what I am missing as it isn’t throwing any error (and usually if a stream isn’t compatible with a container it complains).

  Here is the output. Any ideas ?

  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, matroska,webm, from 'title04.mkv':
  
    Metadata:
  
      encoder         : libmakemkv v1.8.12 (1.3.0/1.4.1) darwin(x86-release)
  
      creation_time   : 2014-08-28 19:36:24
  
    Duration: 00:00:11.34, start: 0.000000, bitrate: 4979 kb/s
  
      Stream #0:0(eng): Video: mpeg2video (Main), yuv420p(tv), 720x480 [SAR 8:9 DAR 4:3], max. 7500 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc
  
      Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
      Metadata:
  
        title           : Stereo
  
      Stream #0:2(eng): Subtitle: dvd_subtitle, 720x480 (default)
  
  Output #0, mpeg2video, to 'title04.m2v':
  
    Metadata:
  
      encoder         : Lavf55.48.100
  
      Stream #0:0(eng): Video: mpeg2video, yuv420p, 720x480 [SAR 8:9 DAR 4:3], q=2-31, max. 7500 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  340 fps=0.0 q=-1.0 Lsize=    4738kB time=00:00:11.31 bitrate=3431.4kbits/s
  
  video:4738kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

• xuggler failed to write header to container

  13 juillet 2015, par user3601262

  I am trying to download video from RTSP stream to a file on my computer using the Xuggler 5.4 library.

  String outputFilename = "D:\\downloadedrtsp.avi";
  
  String inputSource = "rtsp://[ip-address]:[port]/user=[username]&[password]=password&channel=1&stream=1.sdp";
  
  
  
      try {
  
          IContainer container = IContainer.make();
  
          IMetaData im = IMetaData.make();
  
          im.setValue("max_delay", (1000000l) + "");
  
          int retval = im.setValue("rtsp_transport", "tcp");
  
  
  
          container.open(inputSource, IContainer.Type.READ, null, false, true, im, null);
  
          IMediaReader mediaReader = ToolFactory.makeReader(container);
  
  
  
          IMediaWriter mediaWriter = ToolFactory.makeWriter(outputFilename, mediaReader);
  
  
  
          mediaReader.addListener(mediaWriter);
  
  
  
          IError error;
  
          while ((error = mediaReader.readPacket()) == null) {
  
              logger.info("reading packet");
  
          }
  
      } catch (Exception e) {
  
          e.printStackTrace();
  
      }

  But the code fails with a stacktrace

  15:40:52.500 [main] ERROR org.ffmpeg - [tcp @ 00000000171C6BE0] Failed to resolve hostname \downloadedrtsp.avi: ???? ???? ??????????. 
  
  15:40:52.500 [main] ERROR com.xuggle.xuggler - Error: could not write header for container (../../../../../../../csrc/com/xuggle/xuggler/Container.cpp:827)
  
  java.lang.RuntimeException: Error Operation not permitted, failed to write header to container com.xuggle.xuggler.IContainer@387681280[url:D:\downloadedrtsp.avi;type:WRITE;format:com.xuggle.xuggler.IContainerFormat@387719536[oname:rtsp;olongname:RTSP output format;omimetype:null;oextensions:null;];] while establishing stream com.xuggle.xuggler.IStream@387690704[index:1;id:0;streamcoder:com.xuggle.xuggler.IStreamCoder@384527536[codec=com.xuggle.xuggler.ICodec@387719392[type=CODEC_TYPE_AUDIO;id=CODEC_ID_AAC;name=libvo_aacenc;];time base=1/8000;frame rate=0/0;sample rate=8000;channels=1;];framerate:0/0;timebase:1/90000;direction:OUTBOUND;]
  
      at com.xuggle.mediatool.MediaWriter.getStream(MediaWriter.java:1058)
  
      at com.xuggle.mediatool.MediaWriter.encodeAudio(MediaWriter.java:830)
  
      at com.xuggle.mediatool.MediaWriter.onAudioSamples(MediaWriter.java:1441)
  
      at com.xuggle.mediatool.AMediaToolMixin.onAudioSamples(AMediaToolMixin.java:89)
  
      at com.xuggle.mediatool.MediaReader.dispatchAudioSamples(MediaReader.java:628)
  
      at com.xuggle.mediatool.MediaReader.decodeAudio(MediaReader.java:555)
  
      at com.xuggle.mediatool.MediaReader.readPacket(MediaReader.java:469)
  
      at ua.datalink.main.StreamTranscodingExample.readHigherLevel(StreamTranscodingExample.java:103)
  
      at ua.datalink.main.StreamTranscodingExample.main(StreamTranscodingExample.java:121)

  The file is created on program startup, but it’s empty. Where can the problem lies ? I have spend hours to figure it out, but still no result.