VLC --vout flaschen issues on a working setup about flaschen-taschen HOT 2 CLOSED

384 x 64 pixels with 3 bytes each (RGB) is around 72 kIB, which is larger than the 64kIB that fits in a UDP packet.

The send-video and other tools in this library make sure to break up the packet into multiple tiles that each fit into the UDP limit, so you can send arbitrary size images.

The VLC tries to put everything in one packet, but then fails (which you see in the sendmsg: error Message too long message).

I did make a patch to VLC to fix that ( https://mailman.videolan.org/pipermail/vlc-devel/2020-March/132387.html ),
that was last year in March; however, there were review comments, but I never got around addressing them as I was getting involved with pandemic related technical things that required my attention - that is why it is not in VLC yet.

Anyway, you can try my fork of vlc in the branch flaschentaschen-large-image
https://github.com/hzeller/vlc/tree/flaschentaschen-large-image
That contains the necessary change to make VLC work with arbitrary large images. I just refreshed that to be based on latest VLC.

For your applicataion: I'd probably would not go the route through a video encoding and back, but directly encode the raw bytes of the HTML5 canvas as ppm packets (very easy to encode). In the patch you see how the large canvas is split into multiple stripes that each are less than 64kiB.

from flaschen-taschen.

Now it all makes sense! An other quality answer, thank you so much.

I don't think we can send UDP from browser javascript just yet however HTML5 canvas have a captureStream().

https://webrtc.github.io/samples/src/content/capture/canvas-pc/

We are going to look into that.

from flaschen-taschen.