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• Download ONLY audio from a youtube video

  10 juin 2020, par Feras

  I know that there are a million ways to download a video from youtube and then convert it to audio or do further processing on it. But recently I was surprised to see an app called YoutubeToMp3 on mac actually showing "Skipping X mb of video" and supposedly only downloading the audio from the video, without the need to use bandwith to download the entire video and then convert it. I was wondering if this is actually correct and possible at all because I cant find any way to do that. Do you have any ideas ?

  



  EDIT :
After some tests here is some additional information on the topic. The video which I tried to get the audio from is just a sample mp4 file from the internet :

  



  http://download.wavetlan.com/SVV/Media/HTTP/MP4/ConvertedFiles/MediaCoder/MediaCoder_test6_1m9s_XVID_VBR_306kbps_320x240_25fps_MPEG1Layer3_CBR_320kbps_Stereo_44100Hz.mp4

  



  I tried

  



  ffmpeg -i "input" out.mp3

  



  ffmpeg -i "input" -vn out.mp3

  



  ffmpeg -i “input” -vn -ac 2 -ar 44100 -ab 320k -f mp3 output.mp3

  



  ffmpeg -i “input” -vn -acodec copy output.mp3

  



  Unfortunately non of these commands seems to be using less bandwith. They all download the entire video. Now that you have the video can you confirm if there is actually a command that downloads only the audio stream from it and lowers the bandwith usage ? Thanks !

  


• FFMPEG : Fixing frame rate with filter_complex movie filter

  4 mai 2018, par stevendesu

  With some help from @Gyan I came up with the following FFMPEG command which streams 4 videos simultaneously to 4 separate RTMP endpoints, looping the videos infinitely and keeping the audio and video synchronized :

  ffmpeg \
  
      -filter_complex \
  
          "movie=01.mp4:loop=0[v1];[v1]setpts=N/FRAME_RATE/TB[v1];
  
           amovie=01.mp4:loop=0[a1];[a1]asetpts=N/SR/TB[a1];
  
           movie=02.mp4:loop=0[v2];[v2]setpts=N/FRAME_RATE/TB[v2];
  
           amovie=02.mp4:loop=0[a2];[a2]asetpts=N/SR/TB[a2];
  
           movie=03.mp4:loop=0[v3];[v3]setpts=N/FRAME_RATE/TB[v3];
  
           amovie=03.mp4:loop=0[a3];[a3]asetpts=N/SR/TB[a3];
  
           movie=04.mp4:loop=0[v4];[v4]setpts=N/FRAME_RATE/TB[v4];
  
           amovie=04.mp4:loop=0[a4];[a4]asetpts=N/SR/TB[a4]" \
  
      -map "[v1]" -map "[a1]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/01 \
  
      -map "[v2]" -map "[a2]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/02 \
  
      -map "[v3]" -map "[a3]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/03 \
  
      -map "[v4]" -map "[a4]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/04

  This is almost perfect, except that it’s doubling my frame rate :

  frame=20822 fps= 46 q=32.0 q=34.0 q=29.0 q=32.0 size=   57617kB time=00:14:28.39 bitrate= 543.5kbits/s speed=1.92x

  Note the speed=1.92x bit. This is causing the live stream to play at double speed, as well.

  (the original video was approximately 24 fps)

• Is there a way to download FB video like the way youtube-dl does using ffmpeg [duplicate]

  20 avril 2018, par Wayne

  This question already has an answer here :

  • How can I download a video from Facebook using GraphAPI ?
    
    4 answers
    

  I have a simple vba UI that downloads youtube video using youtube-dl in ffmpeg.

  Is there a similar way to be able to download fb public video using ffmpeg ?

  One user request for this feature and I need a direction to start with.

  Google doesn’t seem to have relevant reference or perhaps I am using wrong keyword.

  Any directional information would be highly appreciated.

  Thanks