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• Speed up FFMPEG Mixing Two Audio Files slow

  21 septembre 2016, par Jeremy

  I’m working on a FFMPEG command to mix two audio input’s, combine them (layer ontop of each other), adjust their volumes, and print out to an output. On a 99 second input, it takes about 93 seconds to finish processing and on Mobile, that is way to long.

  I’ve read that I could possibly use -copy to skip reencoding the files, but am unsure of how to do this. Only one of the files are created by the user, so the second input could just be a copy. I have tried using the different presets, fast, ultrafast, and medium but still there is a time delay.

  FFMPEG Command :
  http://pastebin.com/b9u4Snxw

  Any ideas on how to speed this up and reduce processing time ?

  EDIT : Here are my Logs from a successful mix of a recording that was 30 seconds long.
  http://pastebin.com/WxAYWimi

• ffmpeg convert video slow on android [duplicate]

  13 mai 2017, par Nick Sun

  This question already has an answer here :

  • Fast Video Compression on Android
    
    2 answers
    

  I use ffmpeg to convert video on android device.But it will take long time to convert video. For example, the video’s duration is 60s, but it will take 180s or more time. How Can I speed up it ?

  In my project, I import com.writingminds:FFmpegAndroid:0.3.2，and the command as below :

  -y -i /path/to/video.mp4 -strict -2 -vcodec libx264 -preset ultrafast -crf 28 -acodec aac -ar 44100 -ac 2 -b:a 96k -s 320x240 -aspect 16:9 -threads 4 /path/to/convert/video.mp4

• Warning when streaming with vlc and x264 at a slow framerate

  24 octobre 2013, par jln611

  I am using libvlc and libx264 to stream images from a C++ program. It provides libvlc uncompressed images using the get and release callback. Everything seems to work ok at higher framerate (over 12 fps) but when I try slower framerates (from 1 to 10), I got the following warnings :

  [030d5c6c] mux_ts mux debug: adjusting rate at 0/500000 (3/0)
  
  [030d5c6c] main mux warning: late buffer for mux input (2127998)
  
  [030d5c6c] mux_ts mux debug: adjusting rate at 0/500000 (3/0)

  Over 4 fps, I am able to get the stream (for instance with vlc GUI) but under 4 fps, I got nothing, or sometimes a freeze image. The libvlc arguments are the following :

  --imem-get=15543672 --imem-release=15538482 --imem-data=0 --imem-codec=RV24 --imem-cookie=aCookie --imem-cat=2 --imem-height=960 --imem-width=1280 --verbose=2 --imem-id=1 --imem-group=1 --imem-fps=2.000000 -vvv --play-and-exit --no-audio --sout=#transcode{vcodec=h264, fps=2.000000, vb=200k,venc=x264{preset=ultrafast}}:standard{access=http,mux=ts,dst=0.0.0.0:8091/video}

  Any hints would be appreciated.