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• What can cause the CPU usage drop in the script moviepy FFMPEG

  26 juin 2017, par Frikkie Maritz

  What would cause the exporting rate to drop or cpu usage to drop between these 2 scripts

  This one exports with a rate of 15bit/s

  clip1 = VideoFileClip("C:/TBD/TBD/#Frikkie/T1234567/Export/01.mp4")
  
  clip2 = VideoFileClip("C:/TBD/TBD/#Frikkie/T1234567/Export/02.mp4")
  
  clip3 = VideoFileClip("C:/TBD/TBD/#Frikkie/T1234567/Export/03.mp4")
  
  
  
  final = concatenate([clip1,
  
                       clip2.crossfadein(1),
  
                       clip3.crossfadein(1)],
  
               padding=-1, method="compose")
  
  
  
  final.write_videofile('myvideo.mp4')

  This one drops down to only 3 bit/s

  path = "C:\TBD\TBD\#Frikkie\T1234567\Export"
  
  videolist = []
  
  
  
  for clips in glob.glob(os.path.join(path, '**')):
  
      print(clips)
  
  
  
      if ".mp4" in clips:
  
  
  
          videolist.append(VideoFileClip(clips).crossfadein(1))
  
  
  
  print(videolist)
  
  final = concatenate(videolist, padding=-1, method="compose")
  
  final.write_videofile('myvideo.mp4')

• How to cut and merge avi videos with java

  17 août 2017, par Monticle

  I want to cut and merge some avi videos(same codec, same resolution, same fps) using java library.

  Now I am trying this using Humble video(https://github.com/artclarke/humble-video), which is based on ffmpeg.

  I want to use the seek function to cut the input video first, but the result is not correct.

  this is my code.

  public void cutjob(String input, String output, int starttime) {
  
          final Demuxer demuxer = Demuxer.make();
  
          final Muxer muxer = Muxer.make(output, null, "avi");
  
          try {
  
              demuxer.open(input, null, false, true, null, null);
  
              final MuxerFormat format = MuxerFormat.guessFormat("avi", null, null);
  
              int n = demuxer.getNumStreams();
  
              final Decoder[] decoders = new Decoder[n];
  
              for (int i = 0; i < n; i++) {
  
                  final DemuxerStream ds = demuxer.getStream(i);
  
                  decoders[i] = ds.getDecoder();
  
                  final Decoder d = decoders[i];
  
                  if (d != null) {
  
                      if (format.getFlag(MuxerFormat.Flag.GLOBAL_HEADER))
  
                          d.setFlag(Coder.Flag.FLAG_GLOBAL_HEADER, true);
  
                      d.open(null, null);
  
                      muxer.addNewStream(d);
  
                  }
  
              }
  
              muxer.open(null, null);
  
  
  
              demuxer.seek(-1, Long.MIN_VALUE, (long)starttime* Global.getDefaultTimeBase().getDenominator(), Long.MAX_VALUE, Demuxer.SeekFlag.SEEK_ANY.swigValue());
  
              final MediaPacket packet = MediaPacket.make();
  
              long dts = -1;
  
              while (demuxer.read(packet) >= 0) {
  
                  System.out.println("dts:"+packet.getDts() + ",pts:"+packet.getPts());
  
                  final Decoder d = decoders[packet.getStreamIndex()];
  
                  if (packet.isComplete() && d != null) {
  
                      dts = dts == -1 ? packet.getDts() : dts;
  
  
  
                      packet.setDts(packet.getDts() - dts);
  
                      packet.setPosition(-1);
  
                      muxer.write(packet, false);
  
  
  
                  }
  
              }
  
              muxer.close();
  
              demuxer.close();
  
          } catch (InterruptedException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          } catch (IOException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }
  
      }

  The video source is about 190 seconds long, and I set the "starttime" as 180,
  want to cut the last 10 seconds and write to a new avi file.

  The output avi file is 10 seconds long, but only the last 5s of the video is correct, the first 5s seems no data.

  Is there any wrong in my code.
  Thanks.

• Join two flv files with PHP and ffmpeg

  14 avril 2015, par Sergio

  On my website I’m using phpmotion to convert videos into FLV files.
  What I want to do is that after the successful conversion of any new FLV file add short FLV file at the beginning.

  So, I need FFMPEG command in PHP which will join the file 1.flv (intro file) with 2.flv (successful converted file) and as a result create final.flv

  I tried with :

  ffmpeg -i 1.flv -i 2.flv -vcodec copy -acodec copy final.flv

  But without result.

  Thanks for any suggestion.