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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

  


• avformat/evc_muxer : Added muxer to handle writing EVC encoded data into file or outpu...

  15 juin 2023, par Dawid Kozinski

  avformat/evc_muxer : Added muxer to handle writing EVC encoded data into file or output bytestream
   Provided AVOutputFormat structure describing EVC output format (ff_evc_muxer)
  
   Added documentation for EVC muxer
  Signed-off-by : Dawid Kozinski <d.kozinski@samsung.com>
  

  • [DH] doc/muxers.texi
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/rawenc.c

• How can I capture low resolution video on Android reliably across a range of devices ?

  8 décembre 2017, par MisterMat

  Hello Android video experts :)

  I am developing an Android application which allows the user to capture video and upload it to a remote server (it’s more involved than that but the rest of the app is not important). Because of the upload requirement, it is important that the video is of a reasonable size, so not super high resolution. Let’s say a max of 680x480 or 10Mb/minute. This is no problem on Apple devices.

  I have had what can only be described as a complete nightmare trying to capture video at a reasonably low bitrate reliably across a range of Android devices.

  As I understand it there are two ways of capturing video on Android :

  1) Using the Media Recorder/Camera API

  2) Using an Intent to open the cameras video capture application

  Option 1) gives the most flexibility and allows us to easily change the capture resolution. However the Android Camera API is NOT reliable across a range of devices, and I have very good information (including from someone who liaised with Google on this issue) that if you capture video using this API then it will crash on a good 50% of the devices out there. There is a reason that Zoom Camera FX uses an Intent for video capture. Zoom Camera (different app) seems to use Media Recorder, but has lots of bad reviews for video crashing or not working.

  Option 2) works well across a range of devices, as it uses the in built application on the device. The trouble is you have no control whatsoever on the resolution, there is a quality hint on the Intent but the camera app will normally ignore this. My Samsung Galaxy S3 records video by default at about 2Mb/s. This is way too high resolution. The built in application can of course change the resolution, but this relies on action by the user which is difficult to control.

  I understand that I could use a library such as ffmpeg to change the resolution of the video after capture. However this requires me to compile the library for Android, and also I have been informed that in order to legally use the decode/encode codecs on the device you have to pay license fees that amount to about $1 per copy of the app. Since this app will be free to use, this is not an option.

  So that’s where I’m at. I’ve searched long and high for answers, but I can’t figure out how to capture low resolution video reliably using Android.

  Any help very much appreciated !

  Matthew