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• ffmpeg : Video duration confused for some players on Android

  2 juin 2021, par Radi Cho

  I am using ffmpeg to scale down and compress videos to be used in Android app.
The original files are played with no problem and have no metadata issues. When I re-encode them however, the Android player is able to play them, but displays wrong durations. My app is in production and it is using official player implementations, so I wonder if there is a way to fix the corruption using ffmpeg or adding some metadata to the generated files. Hopefully that's possible, but if not - any other possible fixes will be highly appreciated :)

  


  My ffmpeg command is complex, including scaling and encoding but I can confirm this issue is reproducible on my end with the simplest ffmpeg -i video.mp4 -c:v libx264 videogen.mp4 command.

  


  I'm leaving links to the two files if that's helpful for reference.

  


  

  • video.mp4

  


  • videogen.mp4

  


  


  Any ideas what could be causing this and how to fix it ?

  


  Player issues showcase :

  
video.mp4 (original)


  

  
videogen.mp4 (re-encoded)


  

  


• FFmpeg : NetStream.Play.StreamNotFound on RMTP stream

  22 juillet 2014, par user2957378

  I want to take snapshots periodically of a RTMP live video stream.
  I can see the rtmp video stream using VLC. This is the rtmp url :

  rtmp://antena3fms35livefs.fplive.net/antena3fms35live-live/stream-antena3_1

  I’m using the following command to capture the snapshots, according to the official FFmpeg site here :

  ffmpeg -i rtmp://antena3fms35livefs.fplive.net/antena3fms35live-live/stream-antena3_1 -f image2 -vf fps=fps=1 out%d.png

  The command produces the following output :

  ffmpeg version N-64667-gd595361 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jul 14 2014 22:09:48 with gcc 4.8.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzl
  
  libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amr
  
  enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --ena
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 47.100 / 55. 47.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 10.100 /  4. 10.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  HandShake: client signature does not match!
  
  Closing connection: NetStream.Play.StreamNotFound
  
  rtmp://antena3fms35livefs.fplive.net/antena3fms35live-live/stream-antena3_1: Unknown error occurred

  I’ve tried it with another rmtp streams, but I’m still getting the exact same error.

  What could be the problem ?
  Thank you !

• NVidia driver libraries in nvidia/cuda image

  16 février 2018, par Islam Sabyrgaliyev

  I want to run ffmpeg with cuvid hw-accelerated decoding in the container based on official nvidia/cuda image. Ffmpeg is not able to find libnvcuvid.so, although there are all required cuda libs.
  The output of ldconfig -p | grep libnv from the container :

  libnvrtc.so (libc6,x86-64) => /usr/local/cuda-9.0/targets/x86_64-linux/lib/libnvrtc.so
  
  libnvrtc-builtins.so (libc6,x86-64) => /usr/local/cuda-9.0/targets/x86_64-linux/lib/libnvrtc-builtins.so
  
  libnvidia-ptxjitcompiler.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libnvidia-ptxjitcompiler.so.1
  
  libnvidia-opencl.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libnvidia-opencl.so.1
  
  libnvidia-ml.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libnvidia-ml.so.1
  
  libnvidia-fatbinaryloader.so.390.12 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libnvidia-fatbinaryloader.so.390.12
  
  libnvidia-compiler.so.390.12 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libnvidia-compiler.so.390.12
  
  libnvidia-cfg.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libnvidia-cfg.so.1
  
  libnvgraph.so (libc6,x86-64) => /usr/local/cuda-9.0/targets/x86_64-linux/lib/libnvgraph.so
  
  libnvblas.so (libc6,x86-64) => /usr/local/cuda-9.0/targets/x86_64-linux/lib/libnvblas.so
  
  libnvToolsExt.so (libc6,x86-64) => /usr/local/cuda-9.0/targets/x86_64-linux/lib/libnvToolsExt.so

  Should I just copy libnvcuvid.so from the host ? Wouldn’t it break if underlying driver version changes ?