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• nested loop in bash shell

  17 juin 2015, par Tareq Suheimat

  I want to stream video using ffserver and then receive and download it using ffmpeg but first I want to add some noise to the link using netem and the wanted noise will be Bit error,so for the transmitter side there’s no problem the problem is at the receiver side
  so the first loop must contain the percentage numbers of the bit error like 0.2 0.4 0.6 0.8 and do the following command :

  tc qdisc change dev eth0 root netem corrupt 0.1%

  then for each one of the bit error values must repeat it for 10 times and for each try I must download the received video using the following command :

  ffmpeg -i rtsp://localhost:7654/test1-rtsp.mpg -acodec copy -vcodec copy output.mp4 

  so later I end up with too many videos to compare them later.

  please people help me it’s urgent !!!

  tell now I have this scratched code but I don’t know how to compile it together

  for i in {0.2 0.4 0.6 0.8}
  
  do
  
      tc qdisc change dev eth0 root netem corrupt ${i}%
  
  
  
      #(must repeat for each i the ffmpeg download command 10 times)
  
  
  
      #The download command
  
      for x in {1..N}
  
      do
  
          ffmpeg -i rtsp://localhost:7654/test-rtsp.mpg -acodec copy -vcodec copy tested${x}.mp4
  
      done

• How to combine 2 videos using either NReco ffmpeg ConvertMedia or just ffmpeg command line ?

  11 octobre 2016, par M. Ilchuk

  We have 2 videos : video1.webm and video2.webm.
  How to combine these two and get output.mp4 which contains video from video1.webm and audio from video1 and video2 ?

  Example :

  video1(audio1 in video1) + video2(audio2 in video2) = outputVideo(video1 + audio1 +audio2)

  image example

  ffmpeg -i 1.webm -i 2.webm
  ffmpeg version N-81872-gbe1d324 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.4.0 (GCC)
  configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth —enable-bzlib —enable-libebur128 —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-decklink —enable-zlib
  libavutil 55. 32.100 / 55. 32.100
  libavcodec 57. 60.101 / 57. 60.101
  libavformat 57. 51.102 / 57. 51.102
  libavdevice 57. 0.102 / 57. 0.102
  libavfilter 6. 63.100 / 6. 63.100
  libswscale 4. 1.100 / 4. 1.100
  libswresample 2. 2.100 / 2. 2.100
  libpostproc 54. 0.100 / 54. 0.100
  Input #0, matroska,webm, from ’1.webm’ :
  Metadata :
  encoder : libwebm-0.2.1.0
  creation_time : 2016-10-05T07:54:05.064000Z
  Duration : 00:00:30.11, start : 0.000000, bitrate : 798 kb/s
  Stream #0:0(eng) : Audio : opus, 48000 Hz, mono, fltp (default)
  Stream #0:1(eng) : Video : vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 8.33 tbr, 1k tbn, 1k tbc (default)
  Input #1, matroska,webm, from ’2.webm’ :
  Metadata :
  encoder : libwebm-0.2.1.0
  creation_time : 2016-10-05T07:54:20.135000Z
  Duration : 00:00:30.20, start : 0.000000, bitrate : 523 kb/s
  Stream #1:0(eng) : Audio : opus, 48000 Hz, mono, fltp (default)
  Stream #1:1(eng) : Video : vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 1k tbr, 1k tbn, 1k tbc (default)
  At least one output file must be specified.

  No sound from video 2, video 1 but it is very bad.
  The process of converting long.

  >ffmpeg -i 1.webm -i 2.webm -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map 0:v -map "[a]" -ac 2 -shortest output.webm
  
  ffmpeg version N-81872-gbe1d324 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 32.100 / 55. 32.100
  
    libavcodec     57. 60.101 / 57. 60.101
  
    libavformat    57. 51.102 / 57. 51.102
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 63.100 /  6. 63.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  2.100 /  2.  2.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, matroska,webm, from '1.webm':
  
    Metadata:
  
      encoder         : libwebm-0.2.1.0
  
      creation_time   : 2016-10-05T07:54:05.064000Z
  
    Duration: 00:00:30.11, start: 0.000000, bitrate: 798 kb/s
  
      Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
  
      Stream #0:1(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 8.33 tbr, 1k tbn, 1k tbc (default)
  
  Input #1, matroska,webm, from '2.webm':
  
    Metadata:
  
      encoder         : libwebm-0.2.1.0
  
      creation_time   : 2016-10-05T07:54:20.135000Z
  
    Duration: 00:00:30.20, start: 0.000000, bitrate: 523 kb/s
  
      Stream #1:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
  
      Stream #1:1(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 1k tbr, 1k tbn, 1k tbc (default)
  
  [Parsed_amerge_0 @ 00000000026d4400] No channel layout for input 1
  
  [Parsed_amerge_0 @ 00000000026d4400] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
  
  [libvpx-vp9 @ 0000000002592280] v1.6.0
  
  [libopus @ 00000000024d81e0] No bit rate set. Defaulting to 96000 bps.
  
  Output #0, webm, to 'output.webm':
  
    Metadata:
  
      encoder         : Lavf57.51.102
  
      Stream #0:0(eng): Video: vp9 (libvpx-vp9), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 200 kb/s, 8.33 fps, 1k tbn, 8.33 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.60.101 libvpx-vp9
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: opus (libopus), 48000 Hz, stereo, flt, 96 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc57.60.101 libopus
  
  Stream mapping:
  
    Stream #0:0 (opus) -> amerge:in0 (graph 0)
  
    Stream #1:0 (opus) -> amerge:in1 (graph 0)
  
    Stream #0:1 -> #0:0 (vp8 (native) -> vp9 (libvpx-vp9))
  
    amerge (graph 0) -> Stream #0:1 (libopus)
  
  Press [q] to stop, [?] for help
  
  Error while decoding stream #0:0: Cannot allocate memory94 bitrate=  91.8kbits/s speed=2.33x
  
      Last message repeated 4 times
  
  Error while decoding stream #0:0: Cannot allocate memory94 bitrate= 100.0kbits/s speed=1.62x
  
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  Error while decoding stream #0:0: Cannot allocate memory94 bitrate= 133.1kbits/s speed=1.27x
  
      Last message repeated 17 times
  
  Error while decoding stream #0:0: Cannot allocate memory94 bitrate= 160.5kbits/s speed=1.06x
  
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  Error while decoding stream #0:0: Cannot allocate memory94 bitrate= 164.1kbits/s speed=0.932x
  
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  Error while decoding stream #0:0: Cannot allocate memory94 bitrate= 185.8kbits/s speed=0.819x
  
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  Error while decoding stream #0:0: Cannot allocate memory94 bitrate= 212.5kbits/s speed=0.72x
  
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  Error while decoding stream #0:0: Cannot allocate memory28 bitrate= 242.0kbits/s speed=0.68x
  
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  Error while decoding stream #0:0: Cannot allocate memory50 bitrate= 190.1kbits/s speed= 0.9x
  
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  Error while decoding stream #0:0: Cannot allocate memory50 bitrate= 205.9kbits/s speed=0.849x
  
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  Error while decoding stream #0:0: Cannot allocate memory50 bitrate= 209.5kbits/s speed=0.781x
  
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  Error while decoding stream #0:0: Cannot allocate memory50 bitrate= 225.2kbits/s speed=0.741x
  
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  Error while decoding stream #0:0: Cannot allocate memory50 bitrate= 240.9kbits/s speed=0.695x
  
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  Error while decoding stream #0:0: Cannot allocate memory68 bitrate= 239.9kbits/s speed=0.665x
  
  Error while decoding stream #0:0: Cannot allocate memory76 bitrate= 251.1kbits/s speed=0.659x
  
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  Error while decoding stream #0:0: Cannot allocate memory99 bitrate= 211.2kbits/s speed=0.791x
  
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  Error while decoding stream #0:0: Cannot allocate memory99 bitrate= 212.8kbits/s speed=0.751x
  
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  Error while decoding stream #0:0: Cannot allocate memory99 bitrate= 224.7kbits/s speed=0.724x
  
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  Error while decoding stream #0:0: Cannot allocate memory99 bitrate= 225.4kbits/s speed=0.701x
  
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  Error while decoding stream #0:0: Cannot allocate memory99 bitrate= 235.8kbits/s speed=0.678x
  
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  Error while decoding stream #0:0: Cannot allocate memory99 bitrate= 244.0kbits/s speed=0.654x
  
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  Error while decoding stream #0:0: Cannot allocate memory16 bitrate= 242.8kbits/s speed=0.645x
  
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  Error while decoding stream #0:0: Cannot allocate memory00 bitrate= 242.9kbits/s speed=0.638x
  
  Error while decoding stream #0:0: Cannot allocate memory36 bitrate= 246.9kbits/s speed=0.639x
  
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  Error while decoding stream #0:0: Cannot allocate memory46 bitrate= 218.2kbits/s speed=0.727x
  
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  Error while decoding stream #0:0: Cannot allocate memory46 bitrate= 219.9kbits/s speed=0.707x
  
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  Error while decoding stream #0:0: Cannot allocate memory46 bitrate= 227.5kbits/s speed=0.69x
  
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  Error while decoding stream #0:0: Cannot allocate memory46 bitrate= 229.6kbits/s speed=0.673x
  
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  Error while decoding stream #0:0: Cannot allocate memory46 bitrate= 237.3kbits/s speed=0.657x
  
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  Error while decoding stream #0:0: Cannot allocate memory46 bitrate= 238.8kbits/s speed=0.642x
  
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  Error while decoding stream #0:0: Cannot allocate memory46 bitrate= 245.4kbits/s speed=0.627x
  
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  Error while decoding stream #0:0: Cannot allocate memory76 bitrate= 242.9kbits/s speed=0.625x
  
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  Error while decoding stream #0:0: Cannot allocate memory60 bitrate= 246.0kbits/s speed=0.618x
  
  Error while decoding stream #0:0: Cannot allocate memory97 bitrate= 229.5kbits/s speed=0.697x
  
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  Error while decoding stream #0:0: Cannot allocate memory97 bitrate= 235.1kbits/s speed=0.679x
  
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  Error while decoding stream #0:0: Cannot allocate memory97 bitrate= 236.4kbits/s speed=0.664x
  
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  Error while decoding stream #0:0: Cannot allocate memory97 bitrate= 241.4kbits/s speed=0.652x
  
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  Error while decoding stream #0:0: Cannot allocate memory97 bitrate= 242.8kbits/s speed=0.639x
  
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  Error while decoding stream #0:0: Cannot allocate memory97 bitrate= 247.9kbits/s speed=0.627x
  
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  Error while decoding stream #0:0: Cannot allocate memory97 bitrate= 249.4kbits/s speed=0.616x
  
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  Error while decoding stream #0:0: Cannot allocate memory24 bitrate= 252.4kbits/s speed=0.611x
  
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  Error while decoding stream #0:0: Cannot allocate memory96 bitrate= 253.9kbits/s speed=0.612x
  
  Error while decoding stream #0:0: Cannot allocate memory32 bitrate= 252.1kbits/s speed=0.611x
  
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  Error while decoding stream #0:0: Cannot allocate memory45 bitrate= 233.6kbits/s speed=0.663x
  
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  Error while decoding stream #0:0: Cannot allocate memory45 bitrate= 239.7kbits/s speed=0.652x
  
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  Error while decoding stream #0:0: Cannot allocate memory45 bitrate= 245.3kbits/s speed=0.641x
  
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  Error while decoding stream #0:0: Cannot allocate memory45 bitrate= 246.6kbits/s speed=0.629x
  
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  Error while decoding stream #0:0: Cannot allocate memory60 bitrate= 251.4kbits/s speed=0.621x
  
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  Error while decoding stream #0:0: Cannot allocate memory80 bitrate= 254.7kbits/s speed=0.629x
  
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  Error while decoding stream #0:0: Cannot allocate memory93 bitrate= 239.0kbits/s speed=0.676x
  
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  Error while decoding stream #0:0: Cannot allocate memory93 bitrate= 243.4kbits/s speed=0.663x
  
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  Error while decoding stream #0:0: Cannot allocate memory93 bitrate= 247.8kbits/s speed=0.655x
  
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  Error while decoding stream #0:0: Cannot allocate memory93 bitrate= 252.1kbits/s speed=0.644x
  
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  Error while decoding stream #0:0: Cannot allocate memory17 bitrate= 251.6kbits/s speed=0.642x
  
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  Error while decoding stream #0:0: Cannot allocate memory44 bitrate= 253.6kbits/s speed=0.64x
  
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  Error while decoding stream #0:0: Cannot allocate memory40 bitrate= 254.2kbits/s speed=0.644x
  
      Last message repeated 5 times
  
  frame=  249 fps=5.4 q=0.0 Lsize=     946kB time=00:00:30.12 bitrate= 257.2kbits/s speed=0.654x
  
  video:806kB audio:133kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.632650%

• Parallel transcoding with FFmpeg on M1 Mac

  27 août 2021, par Pushkar

  I'm trying to determine how effective an M1 Mac would be for transcoding video using FFmpeg (specifically resizing and adjusting bitrate). I can do single transcodes using a command like this :

  


  ffmpeg -I in.mp4 -nostdin -c:v h264_videotoolbox -c:a copy -vf scale=1280:720 -b:v 8000k out.mp4


  


  Now, when I run this, I can see the process in Activity Monitor, but it shows significant CPU use but 0% GPU use, although it's certainly using some form of hardware acceleration (using libx264 instead of h264_videotoolbox is much slower).

  


  When I try running multiple processes concurrently, the timings suggest little evidence of parallel execution :

  


  





  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  Test	Timing
  convert single test file	6.8s
  convert file 5 times sequentially	33.6s
  convert file 5 times in parallel	31.5s

  


  


  Since the M1 chip is supposed to have 7 or 8 GPUs inside it, I expected to see quite good parallelism, so are there options which I'm missing which would :
  

  


  

  1. ensure that the transcoding is actually running on the GPU ?

  


  2. allow parallel execution across the multiple GPUs ?