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• RTSP streaming on Android client using FFMpeg

  7 février 2021, par rurtle

  I am working on a hobby project the goal for which is to develop an Android application capable of streaming live feeds captured through web cams in a LAN setting using FFMpeg as the underlying engine. So far, I did the following -

  



  A. Compiling and generating FFMpeg related libraries for the following releases -

  



  FFMpeg version : 2.0
  
NDK version : r8e & r9
  
Android Platform version : android-16 & android-18thisthisthisthis
  
Toolchain version : 4.6 & 4.8
  
Platform built on : Fedora 18 (x86_64)
  

  



  B. Creating the files Android.mk & Application.mk in appropriate path.

  



  However, when it came to writing the native code for accessing appropriate functionality of FFMpeg from the application layer using Java, I'm stuck with following questions -

  



  a) Which all of FFMpeg's features I need to make available from native to app layer for streaming real-time feeds ?
  
b) In order to compile FFMpeg for Android, I followed this link. Whether the compilation options are sufficient for handling *.sdp streams or do I need to modify it ?
  
c) Do I need to make use of live555 ?
  

  



  I am totally new to FFMpeg and Android application development and this is going to be my first serious project for Android platform. I have been searching for relevant tutorials dealing with RTSP streaming using FFMpeg for a while now without much success. Moreover, I tried the latest development build of VLC player and found it to be great for streaming real-time feeds. However, it's a complex beast and the goal for my project is of quite limited nature, mostly learning - in a short time span.

  



  Could you suggest some pointers (e.g. links, documents or sample code) on how can I write the native code for utilizing FFMpeg library and subsequently use those functionality from the app layer for streaming real-time feeds ? Moreover, will really appreciate if you could let me know the kind of background knowledge necessary for this project from a functional standpoint (in a language agnostic sense).

  


• Multiple subtitle tracks are not encoded into mov file

  19 juillet 2018, par David Rees

  I am trying to compile a mov file with multiple audio tracks and subtitle tracks to match. Unfortunately only the first subtitle track appears in Quicktime (Intended for Apple Devices). Looking at it compile- it appears that the second subtitle track is not being encoded using the tx3g format

  Command

  ffmpeg \
  
  -i input1.mp3 \
  
  -i input2.mp3 \
  
  -loop 1 \
  
  -i black.png \
  
  -i eng.srt -i zh.srt \
  
  -map 0 -map 1 -map 2 -map 3 -map 4 \
  
  -c:a aac \
  
  -c:v libx264 -pix_fmt yuv420p -shortest \
  
  -c:s:0 mov_text \
  
  -tag:s:s:0 tx3g \
  
  -c:s:1 mov_text \
  
  -tag:s:s:1 tx3g \
  
  -metadata:s:s:0 language=eng -metadata:s:s:1 language=chi \
  
  -metadata:s:a:0 language=eng -metadata:s:a:1 language=chi \
  
  output.mov

  Partial output

      Stream #0:3(eng): Subtitle: mov_text (tx3g / 0x67337874)
  
  Metadata:
  
    encoder         : Lavc57.89.100 mov_text
  
  Stream #0:4(chi): Subtitle: mov_text
  
  Metadata:
  
    encoder         : Lavc57.89.100 mov_text

• Live streaming with ffmpeg is gittery

  8 février 2017, par chubaka

  I started playing around with live streaming with ffmpeg to my rtmp server and was wondering what’s the best approach to it if my approach is sending a chunk of data every 5 or so seconds, because right now it’s kind of gittery and stuttery every time the server gets data.
  Would appreciate any advice or books/articles about this topic in general so I could get the basic idea.