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• udpsrc doesn't work on 2 NIC & Port mirror linux setup (gstreamer/vlc/ffmpeg)

  28 janvier 2021, par kepitto

  I've tried a lot of stuff, but I can't seem to get it to work. (Same problem exists with ffmpeg/vlc)

  


  Basically, I can't get the UDP Stream directly into a videotool. I can verify the data coming in through tcpdump/wireshark etc. and i can also create the videofiles through gstreamer/ffmpeg afterwards, but I can't use the udp source as input.

  


  The current setup is the following :
The camera streams MJPEG through UDP to a fixed address & port. I port mirrored the data from the camera, so that I can verify the data coming in through wireshark on a 3rd device.

  


  The reason behind doing this is that multicast is not supported, so I need a way to get the data on 2 devices through unicast. Port mirroring seemed like a viable solution.

  


  Am I missing something here ? What do I need to do to get this working ?
I thought maybe it's due to the two networkinterface setup as I use 1x usb to ethernet for the port mirror and 1x ethernet for the web, but disconnecting the other shows no difference.
The routing seems correct too : "ip route get camera.ip" returns that the routing is through the usb to ethernet on my static ip.

  


  Example of an attempt :

  


  Gst-launch-1.0 udpsrc port=streamingport(confirmed through wireshark) ! jpegdec ! videorate ! video/x-raw,framerate=30/1 ! autovideosink (does not work)

  


  Gst-launch-1.0 filesrc location=hexdumpfile.txt ! jpegdec ! videorate ! video/x-raw,framerate=30/1 ! autovideosink (does work)

  


• How to use FFMPEG for a whole directory ? (Example code i found on a different thesd doesn't work for me) [closed]

  17 juillet 2020, par TrainNutter

  I have discovered that FFMPEG is a thing and I'm wondering how i can compress many files in 1 bat file execution and that the newly compressed filed keep the same name as the Raw files and subsiquently replace the raw file in MP4 format

  


  I am wondering this as i have over 700GB of Raw videos spanning over 3+ years of recording youtube videos (just for fun) and that my 2TB hard drive is now almost full lol

  


  I Tried using this example but it didn't work for some reason

  


  for i in *.mp4;
    do name=`echo "$i" | cut -d'.' -f1`
    echo "$name"
    ffmpeg -i "$i" "${name}.mp4"
done


  


  Edit : I am using Windows 10

  


• Concatenate multiple mp2 files with constant frame rate 30 results in output with variable frame rate 29.xxx

  2 juin 2020, par cipacda

  I am looking to concatenate multiple mp4 files (hundreds) that I am generating using ffmpeg previously.

  



  I am making sure they have the same codec details and all of them have a constant frame rate of 30FPS.

  



  However, when I concat them using either demuxer or protocol methods, the result has a lower frame rate (i.e. 29.96).

  



  Investigating using ffprobe, looks like the total number of frames match, but the duration is the one that changes.

  



  It is important to be able to do the concatenation without re-encoding as a fast result is needed (all the individual files are created in parallel tasks).