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• adb screenrecord display only screenshot, it does not stream the screen [closed]

  28 avril 2024, par hexols

  I have an Android TV, I want to stream its screen in my Ubuntu PC.
I used this command :

  


  adb shell screenrecord --output-format=h264 - | ffplay -


  


  and after waiting for a while it displays the screenshot of the TV. But I want to display live stream of the Android TV.
I also used the following command as well but got the same result :

  


  adb exec-out screenrecord --bit-rate=16m --output-format=h264 --size 800x600 - | ffplay -framerate 60 -framedrop -bufsize 16M -


  


  How can I achieve this using this command ?
Or is there a way to achieve it with another way by using VLC/Gstreamer/FFMPEG except using scrcpy/vysor ?

  


• How to prevent overwriting fifo while playing local file with ffmpeg ?

  21 juillet 2013, par frankish

  I use av_read_frame() to read and push frames to fifo. In another thread, I read from this fifo. So, reading and writing does not interfere that much.

  However, I found out that when playing from a local file, audio suddenly skips to somewhere else.. I tried to open recorded file with VLC player and it worked. So the file(recording) is not broken.

  I tried (just to see if it works) the following and it works but it has other problems.

  ...
  
  if(localFile){
  
      while(av_fifo_size(fifoPlayback)>2000000){
  
          pthread_mutex_unlock(&fifoPlaybackMutex);
  
          usleep(1000000);
  
          pthread_mutex_lock(&fifoPlaybackMutex);
  
          // Waiting before writing to fifo, it's not empty enough");
  
      }
  
  }
  
  
  
  av_fifo_generic_write(fifoPlayback,...)

  Since the above block at least does not skip, I think my problem is really overwriting on the fifo. But how should I correctly manage this situation ?

• ffmpeg motion snapshot not publishing [duplicate]

  18 mars 2021, par Ali Gökkaya

  I wrote a pip that I broadcast with rtsp with ffmpeg and I can convert it to rtmp broadcast only when there is a movement, the problem is that since my frame count is low, it needs to broadcast after the movement, but when a new movement comes, it takes the old movement to the top, that is, the first movement does not broadcast immediately, it is waiting for the second motion to broadcast. I need help with this issue too

  


  ffmpeg \
-rtsp_transport tcp -skip_frame bidir -i rtsp://........ \
-b:v 100k \
-bufsize 1000k \
-maxrate 200k \
-preset veryslow \
-tune zerolatency \
-an  -f flv -hide_banner \
-r 3 -g 40 -s 848x480 -c:v libx264  \
-filter_complex "select='gt(scene,0.005)',setpts='if(eq(N\,0),0,PREV_OUTPTS+if(lte(T-PREV_INT\,3)\,(T-PREV_INT)/TB\,N*3/TB))',drawtext=fontfile=monofonto.ttf: fontsize=50: box=1: boxcolor=white@0.99: boxborderw=4: fontcolor=black: x=50: y=50: text='%{localtime\:%H\\\\\:%M\\\\\:%S}'" \
-loglevel error rtmp://.....