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• Unable to open FFmpegFrameRecorder stream on a UDP port on Windows

  4 juin 2022, par DeoBelbert

  I am trying to stream a webcam video with FFmpegFrameRecorder and play it with "ffplay" command, but the ffplay command fails with the following message 'udp ://127.0.0.1:25777 : Invalid data found when processing input/0'.

  


  The code I am using for streaming the video,

  


   public void startStreaming() throws Exception {
    OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
    grabber.setVideoCodec(27);
    grabber.setImageMode(FrameGrabber.ImageMode.COLOR);
    grabber.setBitsPerPixel(10);
    grabber.setFormat("yuvj420p");
    grabber.start();
    FFmpegFrameRecorder  recorder = new FFmpegFrameRecorder("udp://127.0.0.1:25777", grabber.getImageWidth(), grabber.getImageHeight());
    recorder.setFrameRate(grabber.getFrameRate());
    recorder.setVideoBitrate(grabber.getVideoBitrate());
    recorder.setOption("listen", "1");
    recorder.setFormat("h264");
    recorder.setPixelFormat(AV_PIX_FMT_YUV420P);
    recorder.setVideoCodecName("h264_videotoolbox");
    recorder.setVideoCodec(27);
    recorder.setOption("keyint", "10");
    recorder.start();}


  


  And I am calling the recorder.record in a thread as follows,

  


  frame = grabber.grabFrame();                      
recorder.record(frame);


  


  After starting the stream, I opened the command line and tried to play the stream with the following command,

  


  ffplay udp://127.0.0.1:25777


  


  And it is failing with the following message,

  


  udp://127.0.0.1:25777: Invalid data found when processing input/0


  


  To get the stream information, I used the following command,

  


  ffmpeg -i udp://127.0.0.1:25777


  


  And it showed the following output,

  


  [h264 @ 0000014dd1424880] non-existing PPS 0 referenced
[h264 @ 0000014dd1424880] decode_slice_header error
[h264 @ 0000014dd1424880] non-existing PPS 0 referenced
[h264 @ 0000014dd1424880] decode_slice_header error
[h264 @ 0000014dd1424880] non-existing PPS 0 referenced
[h264 @ 0000014dd1424880] decode_slice_header error
[h264 @ 0000014dd1424880] non-existing PPS 0 referenced
[h264 @ 0000014dd1424880] decode_slice_header error
[h264 @ 0000014dd1424880] no frame!


  


  But when I tried with TCP protocol it is working fine and I am able to play the video.
How can I fix this issue ? this is the first time I am using the FFmpeg and JavaCV.

  


• FFmpeg "Could not open file" error message when processing with PHP

  22 juin 2022, par FlyingCat

  I am using ffmpeg to get the image from several video files. I got my ffmpeg codes ready but I got the following error when I exec my codes.

  



  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
built on Apr  2 2013 17:02:36 with gcc 4.6.3

*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
//files info...
//files info...
Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
//file info...
[buffer @ 0x1513c40] Buffering several frames is not supported. Please consume all available frames before adding a new one.
 Last message repeated 75 times
[image2 @ 0x1513460] Could not open file : /test/project
av_interleaved_write_frame(): Input/output error


  



  I only show the error messages that have color highlighted. 
My code :

  



   $ffmpeg ="/usr/bin/ffmpeg";

 $image_source_path = '/test/project/test.mp4';
 $ALL_PLACE_WIDTH = 300;
 $ALL_PLACE_HEIGHT = 300;

 $image_cmd = " -r 1 -ss 00:00:10 -t 00:00:01 -s ".$ALL_PLACE_WIDTH."x".$ALL_PLACE_HEIGHT."   -f image2 " ;

 $dest_image_path = '/test/project';

 $str_command= $ffmpeg  ." -i " . $image_source_path . $image_cmd .$dest_image_path;
 shell_exec($str_command);


  



  It seems my Linux wants to me to switch to avconv. I am not sure how to fix these errors. Can someone give me a hint about it ?

  


• Suggestions for an open source non-linear video editor that runs in the command line in Linux that will achieve layering of videos, audio, and photos [closed]

  20 juillet 2022, par Ota-Coder

  I need an open source non-linear video editor that runs in the command line in Linux that will achieve layering of videos, audio, and photos.

  


  What I’m trying to achieve in the end is like a talking heads version of comments on youtube that there would be conversations.

  


  So far, I’ve tried using python opencv combined with ffmpeg xfade transitions using the script I found here - https://stackoverflow.com/a/70043923/13826771 - but sadly, it is linear editing (?) and the result is something like this which doesn’t look like talking heads that are having a conversation - https://streamable.com/bpbbsy

  


  So far I have looked into MLT / Melt but I’m really puzzled and confused about how I should achieve the talking head conversation.

  


  Any help would be appreciated