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• FFmpeg problem while writing streams to file

  23 septembre 2011, par NoviceAndNovice

  I finally "able" to write video stream packets to a file using the function

  av_interleaved_write_frame(outputContext, &packet);

  But after a short period of time i got this error :

  Application provided invalid, non monotonically increasing dts to muxer 
  
  in stream 0: *numberX* >= *numberY*

  Anybody has any idea, what may cause this ? And how to fix it ?

  Best Wishes

• FFMpeg : Webcam capture not fast enough. Ffmpeg dies half way (Linux)

  19 août 2013, par user763410

  I am trying to capture webcam output in liux/ubuntu. I have a chico webcam (lenovo laptop). I am running inside a VMWARE virtual machine. The capture is not proceeding beyond 10 seconds. can you please help.

  The command I used is :

  $ ffmpeg -y  -f video4linux2 -r 20 -s 160x120 -i /dev/video0 -acodec libfaac -ab 128k  /tmp/web.avi

  The most important message I am getting is :

  [video4linux2,v4l2 @ 0x9e43fa0] The v4l2 frame is 46448 bytes, but 153600 bytes are expected

  Complete message from ffmpeg :

  ffmpeg version N-55159-gf118b41 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 18 2013 09:09:13 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-libass --prefix=/opt/ffmpeg --enable-debug --enable-libfreetype
  
    libavutil      52. 40.100 / 52. 40.100
  
    libavcodec     55. 19.100 / 55. 19.100
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
  [video4linux2,v4l2 @ 0x9e43fa0] The V4L2 driver changed the video from 160x120 to 320x240
  
  [video4linux2,v4l2 @ 0x9e43fa0] The driver changed the time per frame from 1/20 to 1/15
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 6424.338678, bitrate: 18432 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 18432 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
  
  Codec AVOption ab (set bitrate (in bits/s)) specified for output file #0 (/tmp/web.avi) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  Output #0, avi, to '/tmp/web.avi':
  
    Metadata:
  
      ISFT            : Lavf55.12.102
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x240, q=2-31, 200 kb/s, 20 tbn, 20 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  [video4linux2,v4l2 @ 0x9e43fa0] The v4l2 frame is 46448 bytes, but 153600 bytes are expected
  
  /dev/video0: Invalid data found when processing input
  
  frame=   29 fps= 14 q=3.5 Lsize=      87kB time=00:00:01.45 bitrate= 490.0kbits/s    
  
  video:80kB audio:0kB subtitle:0 global headers:0kB muxing overhead 7.760075%
  
  [video4linux2,v4l2 @ 0x9e43fa0] Some buffers are still owned by the caller on close.

• Fluent FFMPEG complex filter to split file into multiple outputs

  26 octobre 2020, par lowcrawler

  It appears possible to have multiple outputs from a single FFMPEG command : ffmpeg overlay on multiple outputs

  


  I'd like to know how to do this in FFMPEG. I'm specifically using the complexFilter option in an attempt to split the video into 4 different sizes and place an overlay, and then save the 4 resulting files.

  


  The code is my attempt to simply split the video into 4 and save it. I get the Error: ffmpeg exited with code 1: Filter split:output3 has an unconnected output error. I'm unsure how to connect the output to a file in fluent-ffmpeg.

  


      let ffmpegCommand = ffmpeg() 
        .addInput(path.join(__dirname, PROCESSING_CACHE_DIRECTORY, "tempImage_%d.jpg"))

        .addOutput(outputPathFull)
        .addOutput(outputPathMed)
        .addOutput(outputPathSmall)
        .addOutput(outputPathThumb)


        .toFormat('mp4')
        .videoCodec('libx264')
        .outputOptions('-pix_fmt yuv420p')
        .complexFilter([
        {
                filter: 'split', options: '4',
                inputs: ['0:v'], outputs: [outputPathFull, outputPathMed, outputPathSmall, outputPathThumb]
            },
        ])


  


  When I flip the outputs and put them below the complexFilter, I get 4 files - one with the appropriate quality (and 4x bigger than expected) and the others in very low quality.