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• Using Gstreamer or ffmpeg to create rtsp client on Android

  9 décembre 2014, par Pankaj Bansal

  I want to stream a rtsp stream on android and I finally have come to
  conclusion that I can’t use android API’s MediaPlayer,Videoview etc because
  latency is big issue for me. I need an latency of <500 ms. Now I am
  planning to use Gstreamer or ffmpeg to create an android rtsp client. I just have few
  doubts

  1. Will the Gstreamer or ffmpeg client be able to provide latency <500ms. I read there are
     some parameters which I can tweak to get very low latency. Just want to
     confirm. I have very good network bandwidth. The frame size is generally
     1920X1080.

  2. I read Gstreamer is one made one level above ffmpeg and uses ffmpeg
     codecs to work. I want to know which one is easier to work with for creating an android client. Working on Gstreamer or workig directly on ffmpeg.

  3. If I use Gstreamer android client, Will I have to use the Gstreamer server as well to stream the data ? Currently I am using Live555 RTSP server to stream data

• Revision 7f77a1c3c9 : Merge "Unify intra mode mask into mode_skip_mask scheme"

  12 septembre 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Merge "Unify intra mode mask into mode_skip_mask scheme"

• How create a circular video (transparent area on top of video) effect without applying image mask to video

  26 septembre 2024, par Arina Lubimova

  Basically i googled a lot and solutions suggests apply some PNG mask or do not provide needed solution.

  &#xA;

  What i've found.

  &#xA;

  ffmpeg -i main.mkv -i facecloseup.mkv
 -filter_complex "[1]trim=end_frame=1,
  geq='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':128:128,
  loop=-1:1,setpts=N/FRAME_RATE/TB[mask];
  [1][mask]alphamerge[cutout];
  [0][cutout]overlay=x=W-w:y=0[v];
  [0][1]amix=2[a]"
 -map "[v]" -map "[a]"  out.mp4


  &#xA;

  command = "-i " + this.video1Path.getPath() + " -i " + this.video2Path.getPath() + " -filter_complex [1]trim=end_frame=1,geq=lum_expr='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3)," + (this.mZoomLayout.getZoomedWidth()/2) + "*" + (this.mZoomLayout.getZoomedWidth()/2) + "),255,0)':128:128,format=gray,loop=-1:1,setpts=N/FRAME_RATE/TB[mask];[1][mask]alphamerge,format=rgba,lutrgb=a=if(gte(val\\,16)\\,val)[cutout];[0][cutout]overlay=" + this.mZoomLayout.getCircleX() + ":" + this.mZoomLayout.getCircleY() + ":enable='between(t,0," + this.videoTwoDuration + ") -c:v libx264 -crf 24 -preset ultrafast " + videoPath.getPath(); 


  &#xA;

  So i tried to extract needed things from them, but i don't understand how exactly i need to do that, i did this :

  &#xA;

  ffmpeg -i video.mp4 -filter_complex "[0]geq='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':H:W; [0:v][mask]alphamerge" out.mp4


  &#xA;

  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001f761dd8e40] Invalid stream specifier: mask.
    Last message repeated 1 times
Stream specifier 'mask' in filtergraph description [0]geq='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':H:W; [0:v][mask]alphamerge matches no streams.


  &#xA;

  ffmpeg -i video.mp4 -filter_complex "[0]geq=lum_expr='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':H:W; [0:v][mask]alphamerge" out.mp4


  &#xA;

  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001bfd9218e80] Invalid stream specifier: mask.
    Last message repeated 1 times
Stream specifier 'mask' in filtergraph description [0]geq=lum_expr='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':H:W; [0:v][mask]alphamerge matches no streams.


  &#xA;

  And one more time, guys, if you are going to post some "prepared image mask" solution - just leave, the question is about creating mask on air.

  &#xA;

  So, let's say we have red square (yes, ratio is static, always 1:1), yes, i can't post it because i dont have 10 rep. (...).

  &#xA;

  https://i.sstatic.net/MsL71.png - red square.

  &#xA;

  https://i.sstatic.net/aIFEV.png - circle

  &#xA;

  https://i.sstatic.net/R8EAx.png - result

  &#xA;

  https://i.sstatic.net/WtqQg.png - final result

  &#xA;

  I actually want to get the answer from @Gyan or @llogan because i searched a lot and only these two guys do understand how to make things programmatically.

  &#xA;

  More tech details :&#xA;Aspect ratio is constant - 1:1, width and height should be taken from the video in auto way, we need to create a white square with transparent circle inside it, the end result must contain "rounded" video with white background.

  &#xA;