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• iOs : Low frame per second(fps) for VGA resolution

  26 juillet 2014, par Bhuvan Balasubramanian

  I’m facing an issue in broadcasting video from one iPhone to another iPhone.

  The issue is when I view the friend’s live video in my iPhone, the frame per second(fps) is very low(it is 12fps). Video quality and audio is looking fine but the only problem is fps.

  I don’t know where I need to config/change the code to convert from variable fps to constant fps. Also to increase the fps as **24/30**.

  The resolution I used for broadcasting

  RESOLUTION_VGA,     // 480x640px (landscape) & 640x480px (portrait)

  I’m using following libraries for streaming

  1. MediaLibiOS - link
  2. Ffmpeg-2.2.1
  3. CommLibiOS
  4. libx264-r2409

  Wowza is a Media Server and iOS target version is 7.0

  Please help !

  Thanks in advance.

• converting .mov wrapper with amr_nb audio codec to aac/mp4a codec

  9 janvier 2012, par Wonjoon Lee

  I am trying to implement a video messaging feature for cross platform(Android/iPhone) app.
  Currently, the app on Android records the video with AMR narrowband in .mov wrapper and iPhone cannot play this video. The backend is centos 5.5 and I am wondering if ffmpeg is useful for transcoding this.

• how to reencode with ffmpeg (with limited x264)

  6 septembre 2017, par Sarfraz

  Until now I used this script to reencode my rips for my box (tv decoder) :

  ^_^ ( ~ ) -> cat ~/++/src/convert.sh 
  
  #! /bin/bash
  
  
  
  name=$(path -r "$1") # it gives the file name without the extension
  
  
  
  [ "$1" = *.mp4 ] && ffmpeg -i "$name".mp4 -vcodec copy -acodec copy "$name".mkv
  
  x264 --preset veryfast --tune animation --crf 18 --vf resize:720,576,16:15 -o "$name".tmp.mkv "$name".mkv
  
  mkvmerge -o "$name [freeplayer sd]".mkv "$name".tmp.mkv --no-video "$1"
  
  rm -rf "$name".tmp.mkv
  
  [ "$1" = *.mp4 ] && rm -rf "$name".mkv
  
  exit 0
  
  
  
  #EOF

  It works on my ubuntu and archlinux laptops. But it doesn’t on my desktop witch runs fedora.
  Google says that the x264 package shiped by rpmfusion doesn,t support lavf and ffms2.
  And I cannot unistall it because smplayer (witch i like) needs it.

  Ok, so I have to compile it. Google then says "you have to build ffmpeg, ffms2 tnen x264 ensuring that the flags are correctly refered." Well, didn’t work (ffms2 cannot find LIBAV - even when I am telling where - and x264 does’t configure with lavf...)

  My question is : can I use ffmpeg alone to do what my script does.
  I have ffmpeg version 0.8.11, x264 0.116.2048 59cb2eb and gcc : 4.6.1 20110804 (Red Hat 4.6.1-7)

  EDIT : Ok, I found that : ffmpeg -i input file -acodec copy -vcodec libx264 -preset veryfast -tune animation [that part I don’t have] output