I was wondering if anyone has had any luck with recording screen captures in
Qubes. I tried the following FFmpeg line, which worked fine except it's only
capturing a 640x480 corner of the screen. I'm not sure if this is Qubes-related
or if I'm just not using it correctly. Note, I'm running this inside a Fedora
VM, meaning other VMs' windows seem to be invisible (which is what I want in
this case). Also, window borders and anything else drawn by dom0 seems to be
invisible, but window content appears to be captured fine apart from the
capture area being too small.
$ ffmpeg -f x11grab -i :0.0 -vcodec libvpx -s 1920x1080 /tmp/ffout.webm
[...]
Input #0, x11grab, from ':0.0':
Duration: N/A, start: 1579388031.870036, bitrate: N/A
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 640x480, 29.97 fps,
29.97 tbr, 1000k tbn, 1000k tbc
File '/tmp/ffout.webm' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> vp8 (libvpx))
Press [q] to stop, [?] for help
[libvpx @ 0x56c7902a5900] v1.8.1
Output #0, webm, to '/tmp/ffout.webm':
Metadata:
encoder : Lavf58.20.100
Stream #0:0: Video: vp8 (libvpx), yuv420p, 1920x1080, q=-1--1, 200 kb/s,
29.97 fps, 1k tbn, 29.97 tbc
Metadata:
encoder : Lavc58.35.100 libvpx
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
[...]
Even though I'm setting the output resolution to my screen size, it seems to be
detecting the input resolution at 640x480, and I haven't found any way to
specify input resolution. I've tried with several different codec/container
combinations but it still only captures the upper left corner.
I was wondering if it could have something to do with Qubes because of the way
the desktop is shared by different VMs.
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