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• Does FFMpeg random generate identical sequences of pseudo-random numbers for consecutive executions ?

  31 août 2020, par justew

  For example if I execute command twice :

  


  ffmpeg -i input.mp4 -vf geq=r='random(1)*255':g='random(1)*255':b='random(1)*255' -strict -2 output.mp4

  


  For the same source file, I have identical output files. Why ? I want to get different output files.

  


  Testing configuration :

  


  ffmpeg version 2.8.17-0ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609


  


  I suppose that's because randomizer start value is identical. Does ffmepg have function like srand ?

  


  More specifically I want to add random noise just like this : noise=alls=20:allf=p+t+u. But if I try do so I got the same noise for different executions on the same input file.

  


• Still get error Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_concat_0

  16 avril 2021, par user310291

  Though I hav a=0 I still get the message error above when mixing video with no sound with a sound :

  


  & "ffmpeg.exe" -i "C:\test\demo.mp4" -i "C:\Music\music.mp4" -filter_complex "concat=n=2:v=1:a=0" -f MP4 -y "C:\test\demo_music.mp4"


  


  full log

  


      ffmpeg version 4.3.1-2020-10-01-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
      built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
      configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
      libavutil      56. 51.100 / 56. 51.100
      libavcodec     58. 91.100 / 58. 91.100
      libavformat    58. 45.100 / 58. 45.100
      libavdevice    58. 10.100 / 58. 10.100
      libavfilter     7. 85.100 /  7. 85.100
      libswscale      5.  7.100 /  5.  7.100
      libswresample   3.  7.100 /  3.  7.100
      libpostproc    55.  7.100 / 55.  7.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '\xxx.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf58.45.100
      Duration: 00:02:39.30, start: 0.000000, bitrate: 287 kb/s
        Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1478x926, 278 kb/s, 100 fps, 100 tbr, 12800 tbn, 200 tbc (default)
        Metadata:
          handler_name    : VideoHandler
    Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'yyy.mp3.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2mp41
        encoder         : Lavf58.20.100
      Duration: 00:02:57.42, start: 0.042000, bitrate: 192 kb/s
        Stream #1:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 191 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
    Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_concat_0


  


• stream m3u8 stopped before start

  11 mai 2020, par mastersam

  I have m3u8 link and RTMP server. I wanna stream from m3u8 linkt to RTMP server but when i call command

  



  ffmpeg -re -stream_loop -1 -i xxx.m3u8 -c:v copy -c:a aac -ar 44100 -ab 128k -ac 2 -strict -2 -flags +global_header -bsf:a aac_adtstoasc -bufsize 2000k -f flv rtmp ://xxx

  



  then ffmpeg show "DONE" but not stream.

  



  


  [7] 21629
 ffmpeg version N-97584-gf821ae8 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1 16.04.12) 20160609
 configuration : —enable-openssl —disable-x86asm
 libavutil 56. 43.100 / 56. 43.100
 libavcodec 58. 82.100 / 58. 82.100
 libavformat 58. 42.102 / 58. 42.102
 libavdevice 58. 9.103 / 58. 9.103
 libavfilter 7. 80.100 / 7. 80.100
 libswscale 5. 6.101 / 5. 6.101
 libswresample 3. 6.100 / 3. 6.100
 -c:v : command not found

  
 


  [7]+ Stopped ffmpeg -re -stream_loop -1 -i https://