Re: Video capture on EOS 650d only with 4 to 8 fps?

Am 21. Dezember 2020 08:58:12 MEZ schrieb Marcus Meissner <[email protected]>:

>The Canon EOS sends us JPEG frames and libgphoto2 passes them through.

Ah, so plenty bandwidth. Full HD would then fit through the pipe, too,
but I guess the camera does not offer that.

>How many frames per second does "gphoto2 --capture-movie=10s" report?
>(To rule out ffmpeg rate issues.)

It reports around 44 frames. The number varies. We can rule
out ffmpeg and just observe the capture file, which gives me
mere 19M of movie.

>This might be largely by either delay handling or slow USB ports.

I tested on another machine without improvement, I don't think
the USB port ist slow. I also tested left and right ports (USB 3.0
and USB 2). I hope it is just code missing out on frames
arriving from the camera... so that it can be fixed. The frame rate
seems to start out at 8 fps and then goes down.

>Is the camera connected directly to your machine or a USB2 hub at least?

Directly.


Alrighty then,

Thomas