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• /document/video:189755 : No such file or directory [duplicate]

  1er février 2018, par lavanya lavan

  This question already has an answer here :

  • Android video file path from media store is coming as null
    
    1 answer
    

  I tried ffmpeg for splitting a video. I can’t see any files once it’s split. Anyone guide me pls

  onFailure : WARNING : linker : /data/data/com.dageek.instatoolbox_android/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.

  ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (GCC)
  
    configuration: --target-os=linux
  
      --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/i686-linux-android- 
  
      --arch=x86 --cpu=i686 --enable-runtime-cpudetect
  
      --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot
  
      --enable-pic --enable-libx264 --enable-libass --enable-libfreetype
  
      --enable-libfribidi --enable-libmp3lame --enable-fontconfig
  
      --enable-pthreads --disable-debug --disable-ffserver
  
      --enable-version3 --enable-hardcoded-tables --disable-ffplay
  
      --disable-ffprobe --enable-gpl --enable-yasm --disable-doc
  
      --disable-shared --enable-static
  
      --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config
  
      --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/x86
  
      --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -march=i686'
  
      --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie'
  
      --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
  
  
   libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  
  
   /document/video:189755: No such file or directory

• Produce a fragmented mp4 with the "headless" gem

  2 juillet 2016, par max pleaner

  I’ve found that I can use the headless gem to create an mp4 like so :

    headless = Headless.new(video: {frame_rate: 12, codec: 'libx264'})
  
    headless.start
  
    headess.video.start_capture
  
    headless.stop_and_save("test.mp4")

  And the mp4 file produces is playable.

  How could I make this a fragmented mp4 ?

  The headless gem shows that the following options are supported for the videos hash in Headless.new’s options :

  :codec - codec to be used by ffmpeg
  
  :frame_rate - frame rate of video capture
  
  :provider - ffmpeg provider - either :libav (default) or :ffmpeg
  
  :provider_binary_path - Explicit path to avconv or ffmpeg. Only required when the binary cannot be discovered on the system $PATH.
  
  :pid_file_path - path to ffmpeg pid file, default: "/tmp/.headless_ffmpeg_#{@display}.pid"
  
  :tmp_file_path - path to tmp video file, default: "/tmp/.headless_ffmpeg_#{@display}.mov"
  
  :log_file_path - ffmpeg log file, default: "/dev/null"
  
  :extra - array of extra ffmpeg options, default: []

• ffmpeg filter_complex multiple overlays - why are they not syncing properly

  28 décembre 2023, par howdood

  I'm setting up live streaming using three overlaid inputs in ffmpeg. O:v is a webcam directly connected to the streaming box (a headless linux box) while 2:v and 3:v are ultra-low latency UDP streams from two remote R-Pis.

  


  The filter_complex argument I'm using (that works, with all three video inputs perfectly in sync) is
[0:v] fifo [v1] ;[2:v] fifo [v2] ; [3:v] fifo [v3] ;[v1]setpts=PTS-STARTPTS[sync1] ;[v2]setpts=PTS-STARTPTS[sync2] ; [v3]setpts=PTS-STARTPTS+5/TB [sync3] ;[sync1][sync2] overlay=x=W-w:y=H-h [out1] ;[out1][sync3] overlay=x=0:y=H-h [vfinal]

  


  Two questions about this :

  


  


  1. Why am I having to add +5/TB to [sync3] via setpts (in bold above) ? If I omit that, [3:v] is synced in to the stream noticeably ahead of the other two inputs. My best guess is that this may be to compensate for the processing time of the first overlay [sync1][sync2] which is introducing extra latency into that part of the stream. Is that right ?

     


  


  2. Importantly - the value of the extra pts compensation has to be dialed in by hand and will be specific to the underlying hardware used. Is there a way of getting ffmpeg to calculate this automatically so I don't have to worry about keeping in dialed in, in production ?

     


  


  


  Thanks for reading ! I'm at the limit of the ffmpeg docs here...