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Message #54291
[Bug 899748] [NEW] gstreamer v4l2src fails with device=
Public bug reported:
I have only one video device, it is /dev/video0.
This works:
$ gst-launch 'v4l2src ! xvimagesink'
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
(video plays)
This does not work:
$ gst-launch 'v4l2src device=/dev/video0 ! xvimagesink'
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data flow error.
Additional debug info:
gstbasesrc.c(2582): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming task paused, reason not-linked (-1)
Execution ended after 2532703705 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
This means that I cannot read from video1, or use v4l2loopback or
anything, since gstreamer apparently cannot deal with the device=
setting.
For the record, here is part of gst-inspect v4l2src:
Element Properties:
name : The name of the object
flags: readable, writable
String. Default: null Current: "v4l2src0"
blocksize : Size in bytes to read per buffer (-1 = default)
flags: readable, writable
Unsigned Long. Range: 0 - 18446744073709551615 Default: 4096 Current: 4096
num-buffers : Number of buffers to output before sending EOS (-1 = unlimited)
flags: readable, writable
Integer. Range: -1 - 2147483647 Default: -1 Current: -1
typefind : Run typefind before negotiating
flags: readable, writable
Boolean. Default: false Current: false
do-timestamp : Apply current stream time to buffers
flags: readable, writable
Boolean. Default: false Current: false
device : Device location
flags: readable, writable
String. Default: "/dev/video0" Current: "/dev/video0"
device-name : Name of the device
flags: readable
String. Default: null Current: "UVC Camera (17ef:4807)"
device-fd : File descriptor of the device
flags: readable
Integer. Range: -1 - 2147483647 Default: -1 Current: -1
flags : Device type flags
flags: readable
Flags "GstV4l2DeviceTypeFlags" Default: 0x00000000, "(none)" Current: 0x00000000, "(none)"
(0x00000001): capture - Device supports video capture
(0x00000002): output - Device supports video playback
(0x00000004): overlay - Device supports video overlay
(0x00000010): vbi-capture - Device supports the VBI capture
(0x00000020): vbi-output - Device supports the VBI output
(0x00010000): tuner - Device has a tuner or modulator
(0x00020000): audio - Device has audio inputs or outputs
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gstreamer-tools 0.10.35-1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sat Dec 3 14:33:54 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gstreamer0.10
UpgradeStatus: Upgraded to oneiric on 2011-11-30 (3 days ago)
** Affects: gstreamer0.10 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric
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https://bugs.launchpad.net/bugs/899748
Title:
gstreamer v4l2src fails with device=
Status in “gstreamer0.10” package in Ubuntu:
New
Bug description:
I have only one video device, it is /dev/video0.
This works:
$ gst-launch 'v4l2src ! xvimagesink'
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
(video plays)
This does not work:
$ gst-launch 'v4l2src device=/dev/video0 ! xvimagesink'
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data flow error.
Additional debug info:
gstbasesrc.c(2582): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming task paused, reason not-linked (-1)
Execution ended after 2532703705 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
This means that I cannot read from video1, or use v4l2loopback or
anything, since gstreamer apparently cannot deal with the device=
setting.
For the record, here is part of gst-inspect v4l2src:
Element Properties:
name : The name of the object
flags: readable, writable
String. Default: null Current: "v4l2src0"
blocksize : Size in bytes to read per buffer (-1 = default)
flags: readable, writable
Unsigned Long. Range: 0 - 18446744073709551615 Default: 4096 Current: 4096
num-buffers : Number of buffers to output before sending EOS (-1 = unlimited)
flags: readable, writable
Integer. Range: -1 - 2147483647 Default: -1 Current: -1
typefind : Run typefind before negotiating
flags: readable, writable
Boolean. Default: false Current: false
do-timestamp : Apply current stream time to buffers
flags: readable, writable
Boolean. Default: false Current: false
device : Device location
flags: readable, writable
String. Default: "/dev/video0" Current: "/dev/video0"
device-name : Name of the device
flags: readable
String. Default: null Current: "UVC Camera (17ef:4807)"
device-fd : File descriptor of the device
flags: readable
Integer. Range: -1 - 2147483647 Default: -1 Current: -1
flags : Device type flags
flags: readable
Flags "GstV4l2DeviceTypeFlags" Default: 0x00000000, "(none)" Current: 0x00000000, "(none)"
(0x00000001): capture - Device supports video capture
(0x00000002): output - Device supports video playback
(0x00000004): overlay - Device supports video overlay
(0x00000010): vbi-capture - Device supports the VBI capture
(0x00000020): vbi-output - Device supports the VBI output
(0x00010000): tuner - Device has a tuner or modulator
(0x00020000): audio - Device has audio inputs or outputs
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gstreamer-tools 0.10.35-1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sat Dec 3 14:33:54 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gstreamer0.10
UpgradeStatus: Upgraded to oneiric on 2011-11-30 (3 days ago)
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