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• ffmpeg : mixing concat, apad and amerge in one call

  18 septembre 2016, par GeoffreyB

  I’m trying to merge multiple calls to ffmpeg into one single call.

  I have 2 images, 1 video, and 1 sound to merge together.

  Video : Image 1 (1sec), Image 2 (1sec — fade onto video if possible), Video
  Sound : Sound --- once video start, merge both sounds

  I am able to perform those actions separately (generating a temporary video with images + video), and then merging both sounds, but I’d like to get something faster.

  How can I merge those two filters onto only one ?

  ffmpeg -loop 1 -framerate 60 -t 1 -i thumb.jpg -t 1 -f lavfi -i aevalsrc=0 -framerate 60 -t 1 -i theme.jpg -t 1 -f lavfi -i aevalsrc=0 -i video.mov -filter_complex '[0:0] [1:0] [2:0] [3:0] [4:0] [4:1] concat=n=3:v=1:a=1' tmp.mov

  ffmpeg -i tmp.mov -i audio.mp3 -filter_complex "[0:a]apad [b]; [b][1:a]amerge[a]" -map 0:v -map "[a]" -c:v copy -c:a mp3 -ac 2 -shortest out.mov

  My guess would be something like this ffmpeg -loop 1 -framerate 60 -t 1 -i thumb.jpg -framerate 60 -t 1 -i theme.jpg -i video.mov -i audio.mp3 -filter_complex "[0:0] [1:0] [2:0] [2:a] concat=n=3:v=1:a=1" -map 2:v -map "[a]" -c:v copy -c:a mp3 -ac 2 -shortest out.mov, but this one ends up with the following error : Stream specifier ’:0’ in filtergraph description [0:0] [1:0] [2:0] [2:a] concat=n=3:v=1:a=1 matches no streams.

  Any help would be appreciated ! (also if you know how to get the fade filter in my case, it would be great !)

• Not able to show RTSP stream with Angular

  15 mai 2020, par Q.Rey

  i'm working on a web application with angular where i need to show an rtsp stream inside my window.
I'm using JSMpeg player related to this topic : Not able to Show live camera RTSP streaming with Angular.

  



  For my websocket i used the node websocket library and i runned it like this in my cmd : node websocket-relay.js supersecret 8081 8082

  



  It detect each connection i make on it.

  



  Then for the conversion part i used FFMPEG where I convert a h264 format to mpegts (mpegvideo1 gave me an error)
I run it like this :

  



  ffmpeg -i "rtsp://myurl/media.smp" -vcodec h264 -f mpegts -max_muxing_queue_size 9999 -b 800k -r 30 http://localhost:8081/supersecret/640/480/

  



  For the angular part I have this :

  



  @ViewChild('streaming', {static: true}) streamingcanvas: ElementRef; 

constructor( ... ) { }

ngOnInit() {
    ....
    let player = new JSMpeg.Player('ws://localhost:8081/supersecret', {
        canvas: this.streamingcanvas, autoplay: true, audio: false, loop: true
      })
}



  



  Result in my window : 


  



  What did i missed to make it works and get a real video stream ?

  



  Thanks for help

  



  EDIT : My first ffmpeg command was wrong, only the audio was sent, now i got this :

  



  ffmpeg -i "rtsp://myurl/media.smp" -vcodec h264 -f mpegts -codec:v mpeg1video -s 640x360 -b: 700k -r 25 -bf 0 -codec:a mp2 -ar 44100 -ac 1 -b:a 64k -max_muxing_queue_size 9999 http://localhost:8081/supersecret/640/360/


  



  It still doesnt work but the canvas is not black anymore

  


• how to render android screen to a web page in realtime

  14 août 2012, par Rain Lee

  i'm working on something to remote control android from web browser. something like canvas or flash will draw the android device's screen, and i want it to be very smoothly.

  as i know, we can capture android screen using frame buffer. there a lot of articles about this. But, the fps is very lot, 4 5 fbs at most. is there any way to improve ?

  will something like ffmpeg help？