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• How to encode a series of .dpx files using X264

  4 juin 2015, par user3759710

  I am complete newbie to video encoding. I am trying to encode a series of .dpx files into one single encoded video O/P file in any of the following format. ( .mp4,.avi,.h264,.mkv etc)

  I have tried 2 different approaches. The first one works and the second one does not.
  I would like to know the difference between the two. Any help / input would be much appreciated.

  1) using FFMPEG along with x264 library and it works well. I am able to produce desired output

  ffmpeg -start_number 0 -i frame%4d.dpx -pix_fmt yuv420p -c:v libx264 -crf 28 
  
  -profile:v baseline fromdpx.h264

  2) I first try to concatenate all the dpx files into a single file using concate protocol in ffmpeg and then use x264 to encode the concatenated file.
  Here I see that the size of the concatenated file is the sum of all the files concatenated. But when I use x264 command to encode the concatenated file, I get a green screen (basically not the desired output) .

  ffmpeg -i "concat:frame0.dpx|frame01.dpx|frame2.dpx etc" -c copy output.dpx

  then

  x264 --crf 28 --profile baseline -o encoded.mp4 --input-res 1920x1080 --demuxer raw 
  
  output.dpx

  I also tried to encoded the concatenated file using ffmpeg as follows

  ffmpeg -i output.dpx -pix_fmt yuv420p -c:v libx264 -crf 28 -profile:v baseline fromdpx.h264

  This also gives me a blank video.

  Could someone please point out to me what is going on here ? Why does the first method work and the second does not ?

  Thank you.

• Script to use ffmpeg or Liquidsoap as video automation broadcaster ?

  23 juillet 2017, par Ilimaan

  I would like to build a module to broadcast a fake-live playlist dynamically to an rtmp server. There are may playlist broadcaster like Xsplit, VirtualCam with FFMLE, Wirecast but each of them need a good graphical card to work while cloud server may not have graphical cards. I tried both Liquidsoap with the following congif :

  set("frame.video.width", 1280)
  
  set("frame.video.height", 720)
  
  set("frame.video.samplerate", 25)
  
  set("gstreamer.add_borders", false)
  
  
  
  s = single("/home/user/singlevideo.mp4")
  
  
  
  s = fallback([s, blank()])
  
  
  
  output.gstreamer.audio_video(
  
    video_pipeline=
  
      "videoconvert ! x264enc bitrate=2000 ! video/x-h264,profile=baseline ! queue ! mux.",
  
    audio_pipeline=
  
      "audioconvert ! voaacenc bitrate=96000 ! queue ! mux.",
  
    pipeline=
  
      "flvmux name=mux ! rtmpsink location=\"rtmp://127.0.0.1:1930/live/live live=1\"",
  
    s)

  This is working well, but when I change it from single to playlist("/home/user/playlist.m3u") I got only a black screen (which is the fallback). If someone ever used Liquidsoap with video playlist what to change in this config to get it working ?

  For FFMPEG also it’s working for single video file by cannot stream playlist. If someone have a script that can monitor ffmpeg process and change source 3 secs before end of current file or something like that ?

• Script to use ffmpeg or Liquidsoap as video automation broadcaster ?

  12 mars 2017, par Ilimaan

  I would like to build a module to broadcast a fake-live playlist dynamically to an rtmp server. There are may playlist broadcaster like Xsplit, VirtualCam with FFMLE, Wirecast but each of them need a good graphical card to work while cloud server may not have graphical cards. I tried both Liquidsoap with the following congif :

  set("frame.video.width", 1280)
  
  set("frame.video.height", 720)
  
  set("frame.video.samplerate", 25)
  
  set("gstreamer.add_borders", false)
  
  
  
  s = single("/home/user/singlevideo.mp4")
  
  
  
  s = fallback([s, blank()])
  
  
  
  output.gstreamer.audio_video(
  
    video_pipeline=
  
      "videoconvert ! x264enc bitrate=2000 ! video/x-h264,profile=baseline ! queue ! mux.",
  
    audio_pipeline=
  
      "audioconvert ! voaacenc bitrate=96000 ! queue ! mux.",
  
    pipeline=
  
      "flvmux name=mux ! rtmpsink location=\"rtmp://127.0.0.1:1930/live/live live=1\"",
  
    s)

  This is working well, but when I change it from single to playlist("/home/user/playlist.m3u") I got only a black screen (which is the fallback). If someone ever used Liquidsoap with video playlist what to change in this config to get it working ?

  For FFMPEG also it’s working for single video file by cannot stream playlist. If someone have a script that can monitor ffmpeg process and change source 3 secs before end of current file or something like that ?