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• ffmpeg Error initializing output stream 0:0 — Error while opening encoder for output stream

  23 juin 2018, par gufidown

  I am a newbie in terms of video processing in general and ffmpeg in particular. So this might be a real beginner’s question.

  I am trying to extract frames from an avi. This is the command :

  ffmpeg.exe -i 123.avi -vf select='gt(scene\,0.4)',scale=1920:-1,tile=6x3 -frames:v 1 456.jpg

  And this is the console output :

  ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, avi, from 'C:\work\exports\123.avi':
  
    Duration: 00:02:12.43, start: 0.000000, bitrate: 4455 kb/s
  
      Stream #0:0: Video: rawvideo, pal8, 164x485, 4459 kb/s, 7 fps, 7 tbr, 7 tbn, 7 tbc
  
      Metadata:
  
        title           : FileAVI write  
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 000000eb4f415ec0] deprecated pixel format used, make sure you did set range correctly
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!

  Do I need a particular encoder when working with avi files ? Which one and how do I specify it ?

• How to concat multiple webm files with ffmpeg without getting warnings ?

  3 juillet 2019, par Nane

  I am trying to concat 6 WebM video file same resolution and same codecs using this command ffmpeg -f concat -i mylist.txt -c copy finalvideo.webm but I am getting multiple warnings and final output have only first video file

  mylist.txt

  file '1.webm'
  
  file '2.webm'
  
  file '3.webm'
  
  file '4.webm'
  
  file '5.webm'
  
  file '6.webm'

  ffmpeg log

    built with gcc 7.1.0 (GCC)
  
  
  
  Input #0, concat, from 'mylist.txt':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp
  
      Stream #0:1(eng): Video: vp9 (Profile 0), yuv420p(tv), 1920x1080, SAR 1:1 DAR 16:9, 1k fps, 1k tbr,
  
   1k tbn, 1k tbc
  
      Metadata:
  
        alpha_mode      : 1
  
  Output #0, webm, to 'finalvideo.webm':
  
    Metadata:
  
      encoder         : Lavf57.78.100
  
      Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 1k fps
  
  , 1k tbr, 1k tbn, 1k tbc
  
      Metadata:
  
        alpha_mode      : 1
  
      Stream #0:1(eng): Audio: opus, 48000 Hz, mono, fltp
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
    Stream #0:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [concat @ 0000000000797200] DTS -9223363446920184 < 3900 out of order
  
  DTS -9223363446920184, next:3901000 st:1 invalid dropping
  
  PTS -9223363446920184, next:3901000 invalid dropping st:1
  
  [webm @ 00000000029e20e0] Timestamps are unset in a packet for stream 0. This is deprecated and will st
  
  op working in the future. Fix your code to set the timestamps properly
  
  DTS -9223363446920156, next:3902000 st:1 invalid dropping
  
  PTS -9223363446920156, next:3902000 invalid dropping st:1
  
  DTS -9223363446920128, next:3903000 st:1 invalid dropping
  
  
  
  
  
  
  
  
  
  [webm @ 00000000029e20e0] Application provided invalid, non monotonically increasing dts to muxer in st
  
  ream 0: 4094 >= 0
  
  av_interleaved_write_frame(): Invalid argument
  
  frame=  350 fps=0.0 q=-1.0 Lsize=    2436kB time=00:00:04.09 bitrate=4873.8kbits/s speed=11.7x
  
  video:2576kB audio:46kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Conversion failed!

• ffmpeg rtmp streaming process exit

  12 août 2013, par Samson

  I'm using ffmpeg to capture jpeg images from an rtmp stream. Here is the command I use :

  /usr/local/bin/ffmpeg -threads 4 -i rtmp://..../chat/mp4:<variable>.mp4 
  
  -q:v 0.6 -r 15 -s 320x240 /frames/10021237_data/frame-%0999d.jpg
  
  
  
  ffmpeg version N-55388-g9386f33 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug  8 2013 14:07:38 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  
    configuration: 
  
    libavutil      52. 41.100 / 52. 41.100
  
    libavcodec     55. 24.100 / 55. 24.100
  
    libavformat    55. 13.102 / 55. 13.102
  
    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
  
  Input #0, flv, from &#39;rtmp://......./mp4:10021237.mp4&#39;:
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 1.92 tbr, 1k tbn, 40 tbc
  
      Stream #0:1: Audio: nellymoser, 44100 Hz, mono, flt
  
  [swscaler @ 0x1910000] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to &#39;/frames/10021237_data/frame-%0999d.jpg&#39;:
  
    Metadata:
  
      encoder         : Lavf55.13.102
  
      Stream #0:0: Video: mjpeg, yuvj420p, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 90k tbn, 15 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> mjpeg)
  
  Press [q] to stop, [?] for help
  
  </variable>

  However after a few minutes I get this line (before the process exits) :

  video:5264kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.000408%

  What exactly is the "muxing overhead" and why is it causing a crash ? Can I solve this or get it some other way (by restarting the process when it exits) ?

  EDIT :

  Actually it's not a crash. I'm running this command from a PHP CLI when a stream starts :

   $command = "/usr/local/bin/ffmpeg -i ".$rtmp." -q:v 0.6 -r 12 -s 320x240 ".__DIR__."/".$dir."/".$naming." >/dev/null 2>/dev/null &";
  
  shell_exec($command);

  but when one stops streaming all the ffmpeg processes end. Is there a way to make them independent ?

  Even opening 2 terminals and running the command (with different rtmp s)in each (for different streams), killing one of them closes the other one also.

  Bottom line is : How can I make 2 ffmpeg instances independent so as killing one does not kill the other. Is this behaviour expected ?