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• how to stream a video with canon on raspberrypi4 to pc with rtsp poctocol or other protocol

  20 juillet 2024, par Mirza

  i want to stream or live view with canon camera in gphoto2 module on raspberry pi 4
how to send live view data to pc with lan cable ?
i use gphoto2 and rtsp protocol with many error
can anyone do this ?

  


  i have an canon 550d camera and connected this with usb cable
and use gphoto2 for get liveview data
then i start simple rtsp protocl

  


  now i use this code to add live view to rtsp
gphoto2 —stdout —capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f rtsp -rtsp_transport tcp rtsp ://localhost:8554/mys

  


  when i want to use vls to get this camera has many error

  


• How to prevent ffmpeg from crashing if UDP target is unreachable

  17 décembre 2014, par sg90

  I am using ffmpeg to capture an input video feed from a capture device, save to disk, and relay the feed via udp to a host machine. When the network is down, i.e. an unplugged cable, or faulty switch, or the host is down, ffmpeg crashes with :

  [mpeg1video @ 0x2fdcb20] ignoring invalid SAR: 0/0
Last message repeated 38 times
av_interleaved_write_frame(): Network is unreachable
frame=  758 fps= 25 q=1.0 size=     616kB time=00:00:30.24 bitrate= 166.7kbits/sframe=  758 fps= 25 q=1.0 Lsize=     616kB time=00:00:30.24 bitrate= 166.7kbits/s<br />
video:616kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
Conversion failed!

  When the network crashes, this also crashes the saving to disk. Unfortunately my capture device cannot handle multiple simultaneous access so I can’t split this into two processes (easily).

  I would like to make the UDP streaming fault tolerant to continue trying to stream the next frame if it can’t send any packets. As UDP is "fire and forget", I am quite surprised this already isn’t the default behaviour - I’d even expect HTTP streaming to do the same without crashing. Surely this has happened to other ffmpeg users ?

  Is there a flag I can set to continue/ignore the "Network is unreachable" exception thrown ?

  I’d like to do this without making a custom build of ffmpeg, but if anyone has tried this before I would appreciate any pointers.

  Thanks

• 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 ?