Bug#884332: cheese: could not generate thumbnail

[Daniel Kahn Gillmor]

Package: cheese
Version: 3.26.0-2
Severity: normal

When i take a picture with my webcam with cheese, it shows up in the
bottom bar as a generic icon, rather than as a thumbnail.

on stderr at the same time, cheese emits:

** (cheese:25393): WARNING **: could not generate thumbnail for /home/dkg/Pictures/Webcam/2017-12-13-205800.jpg (image/jpeg)

if i investigate the resulting image with GraphicsMagick, it doesn't
complain about any obvious problems:

$ gm identify -verbose /home/dkg/Pictures/Webcam/2017-12-13-205800.jpg
Image: /home/dkg/Pictures/Webcam/2017-12-13-205800.jpg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Geometry: 1280x720
  Class: DirectClass
  Type: true color
  Depth: 8 bits-per-pixel component
  Channel Depths:
    Red:      8 bits
    Green:    8 bits
    Blue:     8 bits
  Channel Statistics:
    Red:
      Minimum:                  2056.00 (0.0314)
      Maximum:                 63736.00 (0.9725)
      Mean:                    36876.51 (0.5627)
      Standard Deviation:      15328.91 (0.2339)
    Green:
      Minimum:                  4883.00 (0.0745)
      Maximum:                 58339.00 (0.8902)
      Mean:                    34839.42 (0.5316)
      Standard Deviation:      13896.80 (0.2121)
    Blue:
      Minimum:                  6425.00 (0.0980)
      Maximum:                 65535.00 (1.0000)
      Mean:                    38506.94 (0.5876)
      Standard Deviation:      13386.76 (0.2043)
  Filesize: 314.3Ki
  Interlace: No
  Orientation: Unknown
  Background Color: white
  Border Color: #DFDFDF
  Matte Color: #BDBDBD
  Page geometry: 1280x720+0+0
  Compose: Over
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  JPEG-Quality: 85
  JPEG-Colorspace: 2
  JPEG-Colorspace-Name: RGB
  JPEG-Sampling-factors: 1x1,1x1,1x1
  Signature: 30ad6206ccb4a32ca9aded5aff7d88b3b2d9d8b635f61930b3afd44c5fd841e4
  Profile-EXIF: 196 bytes
    Model: Integrated Camera: Integrated C
    Software: Cheese 3.26.0
    Date Time: 2017:12:13 20:58:00
    Exif Offset: 128
    Exif Version: 0230
    Date Time Original: 2017:12:13 20:58:00
    Flash Pix Version: 0100
  Profile-XMP: 3053 bytes
  Tainted: False
  User Time: 0.020u
  Elapsed Time: 0m:0.014761s
  Pixels Per Second: 59.5Mi
$


I welcome any suggestions for further debugging.

  --dkg


-- System Information:
Debian Release: buster/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing'), (500, 'oldstable'), (200, 'unstable-debug'), (200, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.13.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (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          3.26.0-2
ii  gnome-video-effects    0.4.3-1
ii  libc6                  2.25-3
ii  libcanberra-gtk3-0     0.30-5
ii  libcheese-gtk25        3.26.0-2
ii  libcheese8             3.26.0-2
ii  libclutter-1.0-0       1.26.2+dfsg-3
ii  libclutter-gtk-1.0-0   1.8.4-2
ii  libgdk-pixbuf2.0-0     2.36.11-1
ii  libglib2.0-0           2.54.1-1
ii  libgnome-desktop-3-12  3.26.2-1
ii  libgstreamer1.0-0      1.12.3-1
ii  libgtk-3-0             3.22.24-3

Versions of packages cheese recommends:
pn  gvfs  <none>
pn  yelp  <none>

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

-- no debconf information