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• Streaming .264 file while it is being encoded

  1er décembre 2017, par 123435258

  I have been digging around on the internet for a solution of my problem but I still haven’t found any solution yet.

  Let me describe my trouble.

  I have an IP camera that is connected to the another system. The system has a UDP output and transmits every data that is taken from the camera at each 20ms in real-time.

  I have written a Python code that takes the camera data from socket and turns it to a .264 video file while it is being encoded. To display it ;

  I first create a rtp server for streaming and open the URL address in VLC and wait for the second command.

  ffmpeg -i rtp://127.0.0.1:1234 -c copy -f flv rtp://127.0.0.1:1234/PSIA/Streaming/channels/2?videoCodecType=H.264

  Then I give this second command as soon as I run my Python code.

  ffmpeg -re -i C:\Python27\myVideo.264 -c copy -f rtp_mpegts rtp://127.0.0.1:1234 -c copy -f flv 

  What I would like to do is to display the video at real-time with 3 seconds delay forever. However, as mentioned above, the system gives the data at every each 20ms and ffmpeg can’t find the key frames to play the video at real-time at such a speed. I can display the video for 30 seconds with 5 seconds delay, then video turns into images in every 1s which is not a continuous video and which is not I want.

  Any help would be appreciated. Thanks in advance !

• running ffmpeg from Popen inside (twisted) timer.LoopingCall() stalls

  14 février 2014, par user1913115

  I have an RTSP stream which i need to re-stream as HLS. When RTSP stream goes down (e.g. camera disconnects) I put a blue screen to let the user know that the camera went offline. HLS segmenter is running separately, listening on port 22200 for incoming packets.

  in python the code essentially boils down to this :

  import psutil, subprocess as sb
  
  from twisted.internet import reactor, task
  
  from cameraControls import camStatus, camURL
  
  ffOn = False
  
  psRef = False
  
  def monitor():
  
   print "TIMER TICK"
  
   if camStatus()=='ON' and not ffOn: #camera just came online
  
    cmd = ["ffmpeg", "-i", camURL, "-codec", "copy", "-f", "mpegts", "udp://127.0.0.1:22200"]
  
    ps = sb.Popen(cmd,stderr=sb.PIPE)
  
    psRef=ps
  
   #check the stream:
  
   psmon = psutil.Process(psRef.pid)
  
   if psmon.status!=psutil.STATUS_RUNNING: 
  
    print "FFMPEG STOPPED"
  
  
  
  tmr = task.LoopingCall(monitor)
  
  tmr.start(2)
  
  reactor.run()

  it works fine for 5-6 minutes, then i see the video stall and if i check the cpu usage of the ffmpeg it shows 0, the ffmpeg output doesn't change, as if paused. however psmon.status shows as running, and the timer is still going (i see "TIMER TICK" message pop up every 2 seconds in the command line.

  if i simply run the ffmpeg command from the command line (not from python) then it works for hours no problem.

  does anybody know if the twisted reactor is stalling the process ? or is it the subprocess.Popen itself issue ? or the timer itself is glitching somehow(even though it gets to the 'monitor' function) ? i have other timers running also in the same reactor (same thread), could that be an issue ?

• How to re-encode to rgb pixel_format properly in ffmpeg

  1er février 2020, par captain_majid

  I’m using this command to record from multiple inputs :

  ffmpeg -y
  
  -f dshow -rtbufsize 1024M -thread_queue_size 1024 -probesize 64M -i video="screen-capture-recorder" -framerate 30
  
  -f dshow -rtbufsize 16M -i audio="virtual-audio-capturer"
  
  -f dshow -rtbufsize 16M -i audio="Microphone (DroidCam Virtual Audio)"
  
  -f dshow -rtbufsize 512M -thread_queue_size 512 -probesize 50M -i video="DroidCam Source 3"
  
  -stream_loop -1 -i ".\media\background sounds\blue.mp4"
  
  -i ".\media\pictures\Webcam Overlay\blue_.png"
  
  -i ".\media\pictures\Webcam Overlay\red.png"
  
  -f gdigrab -rtbufsize 512M -thread_queue_size 512 -probesize 64M -itsoffset 0.80 -i title="NohBoard v1.2.2" -framerate 60 -draw_mouse 0
  
  
  
  -filter_complex "
  
  [0:v] scale=1366x768 [desktop];
  
  [3:v] hue=s=-5, scale=240x160 [webcam];
  
  [desktop][webcam] overlay=x=W-w-285:y=H-h-7:format=rgb [deskCam];
  
  [4:v] format=rgba,colorchannelmixer=aa=0.5, scale=240x160 [vid];
  
  [deskCam][vid] overlay=x=W-w-5:y=H-h-245:format=rgb [deskCamVid];
  
  [deskCamVid][5:v] overlay=x=W-w-280:y=H-h-0:format=rgb [deskCamVidBlue];
  
  [deskCamVidBlue][6:v] overlay=x=W-w-0:y=H-h-238:format=rgb [deskCamVidBlueRed];
  
  [7:v] chromakey=0x00FF00:similarity=.200, scale=420x140 [kb];
  
  [deskCamVidBlueRed][kb] overlay=x=W-w-945:y=H-h-285:format=rgb [final];
  
  [1][2] amix [aud1]; [1][2][4] amix=inputs=3 [aud2]"
  
  -map "[final]" -map "[aud1]" -map "[aud2]" -metadata:s:a:0 title="No Music" -metadata:s:a:1 title="All sounds" out.mkv

  The problem is the colors are not as bright as I want unless adding :format=rgb to all overlays like seen above, but this delays my encoding a lot, also when I press ’Q’, only a small part of the video (like 1m of 3m) is produced.

  Also If you see any unnecessary switches or non-optimal ones, please advise.