Bug#825464: cheese: Video appears only for a brief instant after startup

[Hugo Musso Gualandi]

Package: cheese
Version: 3.20.2-1
Severity: important

Dear Maintainer,

After I open Cheese, the video appears for a brief instant (perhaps only a
single frame or so) and then immediately goes back to a black screen that says
"There was an error playing video from the webcam"

I get the following error message in the standard error stream:


(cheese:10630): cheese-WARNING **: Internal data flow error.:
gstbasesrc.c(2948): gst_base_src_loop ():
/GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/GstBin:bin28/GstV4l2Src:v4l2src1:
streaming task paused, reason not-negotiated (-4)


One workaround I found was running cheese under "sudo". That causes the video
to appear just fine and the "internal dataflow error" message goes away.

However, I suspect that this is a bug in cheese and not just me having the
wrong permissions set up. Firstly, there is a brief glimpse of video when I run
cheese without sudo, so it appears to have permissions to bet to the video in
the first place. Secondly, in other applications I tested (guvcview and Skype)
the webcam seems to work just fine, without requiring me to use sudo.



-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.5.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=pt_BR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages cheese depends on:
ii  cheese-common          3.20.2-1
ii  gnome-video-effects    0.4.1-3
ii  libc6                  2.22-9
ii  libcanberra-gtk3-0     0.30-3
ii  libcheese-gtk25        3.20.2-1
ii  libcheese8             3.20.2-1
ii  libclutter-1.0-0       1.26.0-2
ii  libclutter-gtk-1.0-0   1.8.0-1
ii  libgdk-pixbuf2.0-0     2.34.0-1
ii  libglib2.0-0           2.48.1-1
ii  libgnome-desktop-3-12  3.20.2-1
ii  libgstreamer1.0-0      1.8.1-1
ii  libgtk-3-0             3.20.4-1

Versions of packages cheese recommends:
ii  gnome-icon-theme    3.12.0-1
ii  gvfs                1.28.2-1
ii  hicolor-icon-theme  0.13-1
ii  nautilus-sendto     3.8.3-1
ii  yelp                3.20.1-1

Versions of packages cheese suggests:
pn  gnome-video-effects-frei0r  <none>

-- no debconf information