Re: Live view on Canon EOS M50

On Mon, May 18, 2020 at 10:51:00AM +0200, Antonio Cuni wrote:
> On Mon, May 18, 2020 at 9:15 AM Marcus Meissner <[email protected]> wrote:
> 
> 
> > > The first weird thing which I noticed is that now gphoto is VERY slow at
> > > establishing a connection with my camera (via usb): before it took 0.16
> > > seconds, now it takes 24 seconds 😱:
> >
> > Can you capture a debug logfile of this?
> >
> >         gphoto2 --auto-detect --debug --debug-logfile=xx.log
> >
> > This will have timestamps in front so we can see where the delays comes
> > from.
> >
> > It could be a filesystem access or similar during the "directory" driver
> > probing.
> >
> 
> I attach three logs: m50-autodetct-fast.log is taken with the ubuntu's
> libgphoto, m50-autodetect-slow*.log are taken with the one I compiled from
> git.
> 
> I tried to compare the two, but I don't see any obvious culprit: it seems
> to wait ~2s every now and then. I tried to run it multiple times, and the
> 2s delay seems to be inserted always in the same positions, though.
> I also realized that earlier I compiled libgphoto2 without libusb-1.0; but
> now I recompiled it with libusb-1.0 support and the problem is still
> present.

It seems to have massive delays during USB device access of some USB devices
on the system.

Is something like USBguard running or are there hardware troubles?

Are Hubs or other devices involved that auto-powerdown?

Can you go through your plugged in USB devices / hubs, unplug them temporary,
test gphoto2, and pinpoint the ones causing delays?

 
> I actually forgot to commit and push it, sorry...  It is now in there.
> >
> [...]
> 
> > Can you try the one I did? It will need a --set-config output="TFT + PC"
> >
> 
> Yes, I confirm it works! For future reference in case someone find this
> thread by googling, this is the command line which makes it working:
>     gphoto2 --set-config output="TFT + PC" --capture-movie=30s

Thanks! :)

Ciao, Marcus


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