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• Create muted video and black screen video with FFmpeg

  2 mars 2021, par user2685832

  I'm trying to use FFmpeg to generate the following from a local mp4 file :

  



  

  • A copy of the original video with no audio

  


  • A copy of the original video with audio but without visuals (a black screen instead). This file also needs to be in mp4 format.

  


  



  After reading through the documentation I am struggling to get the terminal commands right. To remove the audio I have tried this command without any success :

  



  ffmpeg -i file.mp4 -map 0:0 -map 0:2 -acodec copy -vcodec copy


  



  Could anyone guide me towards how to accomplish this ?

  


• Create muted video and black screen video with FFmpeg on OS X

  22 septembre 2017, par user2685832

  I’m trying to use FFmpeg on OS X to generate the following from a local mp4-file :

  • A copy of the original video with no audio
  • A copy of the original video with audio but without visuals (a black screen instead). This file also needs to be in mp4 format.

  After reading through the documentation I am struggling to get the terminal commands right. To remove the audio I have tried this command without any success :

      ffmpeg -i file.mp4 -map 0:0 -map 0:2 -acodec copy -vcodec copy

  Could anyone guide me towards how to accomplish this ?

  Thanks !

• RED5 1.0.2 recorded FLV convert to Mobile/HTML5 format with FFMPEG av out of sync

  14 août 2014, par Daew dawe

  I have problem with recorded video in Red5 v1.0.2 (i had issues with previous v1, it does not recorded any video, with 1.0.2 it works). When I record flv I want to convert it to some mp4. But I have problem with settings, because every time there is some issue with quality/audio sync. Can u please help me how to convert with ffmpeg (in future automatic process on server).

  Second problem is that in flash client buffer length is always 0, but in v0.8 it was filled and on end I waited until empty, here I’m not sure how long should I wait. I founded this url http://code.google.com/p/red5/issues/detail?id=312 where they said to wait until i get UnPublish.Success, but that event I got only after ns.close()

  My flash client record settings is (FP10) :

  video :

  • resolution = 640x360
  • fps = 30
  • keyframeinterval = 15
  • video quality = 90
  • bandwidth = 0

  audio :

  • microphone codec = SPEEX
  • encodeQuality = 9

  • silencelevel = 0

  • bufferTime = 15

  recorded video parameters in VLC (translated from czech to english) :

  video

  • Codec : Flash Video (FLV1)
  • Resolution : 640x360
  • format : Planar 4:2:0 YUV

  audio

  • codec : Speex Audio (spx )
  • frequency : 16000Hz
  • bits per sample : 16
  • data flow : 16 kb/s

  FFMEPG info about video :

   Metadata:
  
     server          : Red5 Server 1.0.2 Rev: 4616
  
     creationdate    : Mon Sep 02 23:17:08 CEST 2013
  
     canSeekToEnd    : true
  
   Duration: 00:00:33.24, start: 0.000000, bitrate: 645 kb/s
  
     Stream #0:0: Video: flv1, yuv420p, 640x360, 625 kb/s, 1k tbr, 1k tbn, 1k tbc
  
  
  
     Stream #0:1: Audio: speex, 16000 Hz, mono, s16, 16 kb/s

  bsplayer showing 25fps - but I recorded 30fps, I dont understand this so much.

  what I tried with ffmpeg (I’m ffmpeg newbie).

  First I recorded 33sec long video

  when I convert audio with command : ffmpeg -i test.flv -ar 44100 -ab 160k -ac 1 output.mp3 , then the audio have only 30sec

  I tried this commands, but no one with good solution

  ffmpeg -i test.flv -vcodec mpeg4 -acodec libvo_aacenc output.mp4
  
  
  
  ffmpeg -i test.flv -acodec libvo_aacenc -aq 200 outputsss.mp4
  
  
  
  ffmpeg -i test.flv -c:v libvpx -c:a libvorbis output.webm // here is sound synced good - but sound have repeating silence lags (every 1-2s)

  really thank you for your help, I’m fighting with conversion many days :(