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• ffmpeg url protocol - annoying issue with url_seek

  7 juin 2014, par Gieas

  I’m trying to add my own URL protocol to my improved dranger’s video player using ffmpeg.

  The URLPRotocol is : http://www.ffmpeg.org/doxygen/2.1/structURLProtocol.html

  It seems that (For some weird reason) ffmpeg calls my ’url_seek’ before the movie even starts.

  The function prototype is the same as lseek’s :

  int64_t my_url_seek(URLContext *h, int64_t pos, int whence)

  FFmpeg first calls the function with the values : POS = 0 , WHENCE = 65536

  According to ffmpeg’s docs the value 65536 (AVSEEK_SIZE) means that ffmpeg wants the video size - so, my server responses to it with the video size.
  But after that, it tries to seek with weird values :
  POS = 8827210, WHENCE = 0, POS = 9912, WHENCE = 0 and so on.. (Same values all the time)
  Anyways, according to ffmpeg’s doc whence should return the current position of the file (measured from the beginning of the file in bytes) and that is what I’m giving him (Except special case when it wants the video size as I mentioned before) - but it still doesn’t work.

  I don’t get it. What is it trying to do ? It can’t really be my fault because I did just use dranger’s video player and registered my own protocol. anyone has any idea what’s going on here ?

• Possible to stream video over 115kbps ?

  15 mai 2014, par Arcadio Alivio Sincero

  I need some advice from people experienced with streaming video.

  I have a task to put together a system that allows video coming from RS-170 (composite) video cameras and have them displayed on an iPad. The catch is that no wireless (no Wi-Fi, no bluetooth) is allowed. Only a wired interface.

  The physical I/O options on an iPad are apparently extremely limited, but I did manage to come across a company named Redpark that makes an RS232-to-Lightning cable. So my proposed solution is to have the video feeds go into a box with software that digitizes and encodes the video, and then sends it over RS232 to the iPad using that cable. The catch here is that the maximum bandwidth on that cable is 115kbps.

  My preliminary testing of this setup on a prototype system have been less than stellar so far. I set up two PCs, each with serial ports, and hooked them together with a null modem. I then set the baud rates of the ports to 115kpbs and then attempted to stream a web cam video feed over the serial connection in real-time using ffmpeg. The results weren’t very encouraging, but I at least did manage to get some sort of image to show up.

  I guess I need to play around with the ffmpeg encoding options some more. But I need to ask : am I wasting my time with this idea, or should what I am asking here be possible ?

• grabbing hevc h265 stream using ffmpeg

  26 août 2021, par hendyman

  I have a problem when I try to grab h265 encoded video from ip camera using rtsp protocol.
I want to save stream from camera and i use https://github.com/sahilchaddha/node-rtsp-recorder/ to do this. Almost all works perfectly but output video has green bars and I don't know why.

  


  These are my parameters

  


  ChildProcess {
  _events: [Object: null prototype] {},
  _eventsCount: 0,
  _maxListeners: undefined,
  _closesNeeded: 1,
  _closesGot: 0,
  connected: false,
  signalCode: null,
  exitCode: null,
  killed: false,
  spawnfile: 'ffmpeg',
  _handle: Process {
    onexit: [Function],
    pid: 96408,
    [Symbol(owner_symbol)]: [Circular]
  },
  spawnargs: [
    'ffmpeg',
    '-i',
    'rtsp://[...]',
    '-vcodec',
    'copy',
    'videos/cam1/Aug-26th-21/video/2021-8-26-5-51-13.mp4'
  ],
  pid: 96408,
  stdin: null,
  stdout: null,
  stderr: null,
  stdio: [ null, null, null ],
  [Symbol(kCapture)]: false
}


  


  and result
image