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• Video recorded using Kurento is corrupted

  10 avril 2023, par Pranjal Lamba

  We are using Kurento media server v6.6.1 to record a video conference. The web app client which runs on Chrome(Windows, OSX, Android) is using a modified version of one-to-one-call-advanced Kurento sample and the second client is an Android native application which is using Nubomedia webrtcpeer v1.1.1. Nubomedia webrtcpeer uses LibJingle built by io.pristine v11139(released on December 2015). The video and audio is recorded in two separate recorder endpoints by Kurento.

  


  Video conference recordings generated using web app client/s are working properly. But sometimes the video generated using native application contains all the frames within initial few seconds. Please find below download link for the problematic video generated by our Android native application,

  


  https://drive.google.com/file/d/1vOVk8hPuP_iOlQfsmMoqZLhICy-Jpcee/view?usp=sharing

  


  We are testing this feature on a range of Android devices, Nexus 5(Android 6.0.1), Nexus 6(Android 7.1.1), Sony Xperia Z Tablet(Android 6.0.1), Samsung Galaxy Tab A(Android 5.0), OnePlus 3(Android 7.1.1), Xiaomi A1(Android 7.1.1). The issue randomly starts occurring on a bunch of these devices while the others work properly and vice-versa.

  


  We are recording the videos with the following constraints,

  


  Web app client

  


  Minimum video width : 32
  
Minimum video height : 32
  
Maximum video width : 320
  
Maximum video height : 320
  
Minimum framerate : 1
  
Maximum framerate : 15
  
Video container format : MP4
  
Video codec : H.264
  
Audio codec : AAC

  


  Android native client

  


  Minimum video width : 32
  
Minimum video height : 32
  
Maximum video width : 480
  
Maximum video height : 640
  
Minimum framerate : 1
  
Maximum framerate : 25
  
Video container format : MP4
  
Video codec : H.264
  
Audio codec : Opus

  


• FFmpeg -bash : ffmpeg : command not found

  12 février 2015, par Daniel Khajehpour

  OK, so I have gone up and down the internet trying to figure out what it is I am doing wrong ... and yet I’m in the middle of nowhere.
  I am basically trying to install the FFmpeg on my CENTOS 6.6 dedicated server by following the instructions here : https://trac.ffmpeg.org/wiki/CompilationGuide/Centos

  Everything seems to go just fine throughout the process. When it’s all done, I type in "ffmpeg" hit the enter and keep on getting this extremely ugly error :

  -bash : -bash: : command not found

  I’m not much of a shell guy, but working with it all day today, I can say that this means that it’s not installed correctly. So, I tried re-installing it, and it tells me all the packages already exist now ... . Here is a copy if what I am doing and what I am getting :

  root@server1 [~]# ffmpeg -version
  
  -bash: ffmpeg: command not found
  
  
  
  root@server1 [~]# yum install autoconf automake gcc gcc-c++ git libtool make nasm pkgconfig zlib-devel
  
  Loaded plugins: fastestmirror, priorities, security
  
  Setting up Install Process
  
  Loading mirror speeds from cached hostfile
  
   * base: centos.mirror.ndchost.com
  
   * extras: centos-distro.cavecreek.net
  
   * updates: mirrors.easynews.com
  
  Package autoconf-2.63-5.1.el6.noarch already installed and latest version
  
  Package automake-1.11.1-4.el6.noarch already installed and latest version
  
  Package gcc-4.4.7-11.el6.x86_64 already installed and latest version
  
  Package gcc-c++-4.4.7-11.el6.x86_64 already installed and latest version
  
  Package git-1.7.1-3.el6_4.1.x86_64 already installed and latest version
  
  Package libtool-2.2.6-15.5.el6.x86_64 already installed and latest version
  
  Package 1:make-3.81-20.el6.x86_64 already installed and latest version
  
  Package nasm-2.07-7.el6.x86_64 already installed and latest version
  
  Package 1:pkgconfig-0.23-9.1.el6.x86_64 already installed and latest version
  
  Package zlib-devel-1.2.3-29.el6.x86_64 already installed and latest version
  
  Nothing to do

  Any ideas or help is greatly appreciated !

• How to rotate mp4 files in Android

  23 octobre 2018, par ravi

  I have a mp4 file(already recorded) and want to change the rotation(including meta data) of the video. There is a way to do this using Hex Editor where in you find the track header(tkhdr) and replace the rotation matrix with the required rotation.

  I know this can be done using ffmpeg library but I do not want to use the library instead I want to do this in Android using JAVA. Let me know if anyone has done this before.

  Thanks
  Ravi

  Reference link