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• ffmpeg : two videos side-by-side with audio1 lang=ger & audio2 lang=eng

  19 janvier 2023, par miridigital

  I have two videos from two GoPro cameras. Both videos are rendered via ffmpeg side-by-side into a single video (left and right) and the audio is currently combined/mixed into two channels (stereo). I can hear both camera audio channels at the same time.

  


  Two channels stereo :

  


  ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[v]; [0:a][1:a]amerge[a]" -map "[v]" -map "[a]" -ac 2 side-by-side.mp4


  


  audio from both videos mixed into a single file with 2 channels - mediainfo

  


  Now I want to switch between the two audio channels (cam1 or cam2) while I'm playing the side-by-side video.

  


  My first try : With four channels (without -ac 2 parameter) :

  


  ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[v]; [0:a][1:a]amerge[a]" -map "[v]" -map "[a]" side-by-side.mp4


  


  audio from both videos mixed into a single file with 4 channels - mediainfo

  


  But the most video players can't easily select the channels 1+2 or 3+4 while playing.

  


  So I tried two languages :

  


  ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[v]; [0:a][1:a]amerge[a]" -map "[v]" -map "[a]" -metadata:s:a:0 language=ger -metadata:s:a:1 language=eng side-by-side.mp4


  


  audio from both videos mixed into a single file with 4 channels with languages - mediainfo

  


  But that's wrong. I can only see german with 4 channels. How can I put channels 1+2 into german and channels 3+4 into english ? Afterwards I should be able to use the multi language feature from most video players to switch the audio between cameras.

  


  Thank you,
  
Miriam

  


• Automatize Command Line to a HTML button

  29 janvier 2015, par Plankkan

  Info

  I am working on a native project where I try to render a HTML animation into a video.
  I am currently using programs like PhantomJS and FFmpeg to get the video out of the HTML animation using Command Lines. I follow a tutorial as seen in the link below :

  http://mindthecode.com/recording-a-website-with-phantomjs-and-ffmpeg

  Question

  I would like to automatize a button to do the Command Line.

  Is it possible to make a HTML onClick button which refers to a jQuery code, and this code will then initiate a .sh or .bat file that will run the Command Line :

  phantomjs runner.js | ffmpeg -y -c:v png -f image2pipe -r 25 -t 10  -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart dragon.mp4

• FFMpeg : Stream desktop to another network

  7 octobre 2019, par A Person

  I hope you can help me in this quest :

  I have been trying to stream my desktop through direct show or inbuilt screen grabber. i want to be able to send it to another network so i can view the stream lets say my home desktop from work. The aim is to be able to stream a monitoring station from my setup from the the network (home) and view on WIFI (Work).

  I have done the following so far :

  ffmpeg -f dshow -i video="screen-capture-recorder":audio="virtual-audio-capturer" -vcodec h264_nvenc -f mpegts udp://10.1.0.0:1234

  However, the issue is that I can only view the stream on the same network.

  I tried passing the public IP of the network as the udp/rtp link but still doesn’t work.

  when i tried changing the udp to rtp I get the error saying sdp required, but again I am not sure this will stream to another network rather than same network.

  My aim is this.

  Have my desktop stream over some IP or anything and either use ffplay or vlc to view it from another network.