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Playing around with gstreamer fails strangely

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Paolo Bolzoni-2

Playing around with gstreamer fails strangely

Dear list,

Here is my first tries:

# modprobe --first-time v4l2loopback devices=2 exclusive_caps=0
# gst-launch-1.0 videotestsrc ! videoconvert ! v4l2sink device=/dev/video1

However this fails (see the error lines in the bottom) and I quite
confused because I am sure
in the past I was able to make it work.

I used gst-inspect-1.0 to verify that all caps are fine and everything
seems correct. What can i try?

Cheers,
Paolo

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data
stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
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Gst-Geek

Re: Playing around with gstreamer fails strangely

Ideally this pipeline should work as videotestsrc is intelligent enough to
generate video date compatible with the downstream.

Can you prove debug logs of the pipeline

gst-launch-1.0 videotestsrc ! videoconvert ! v4l2sink device=/dev/video1
--gst-debug=2

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Nicolas Dufresne-5

Re: Playing around with gstreamer fails strangely

In reply to this post by Paolo Bolzoni-2

Le ven. 18 mai 2018 02:57, Paolo Bolzoni <[hidden email]> a écrit :

Dear list,

Here is my first tries:

# modprobe --first-time v4l2loopback devices=2 exclusive_caps=0
# gst-launch-1.0 videotestsrc ! videoconvert ! v4l2sink device=/dev/video1

However this fails (see the error lines in the bottom) and I quite
confused because I am sure
in the past I was able to make it work.

I used gst-inspect-1.0 to verify that all caps are fine and everything
seems correct. What can i try?

V4L2loopback is very buggy, and causes random failures. This has been reported, but no fixes has been made.

Cheers,
Paolo

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data
stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
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Paolo Bolzoni-2

Re: Playing around with gstreamer fails strangely

On Fri, May 18, 2018 at 11:45 AM, Vinod Kesti <[hidden email]> wrote:
> Can you prove debug logs of the pipeline
>
> gst-launch-1.0 videotestsrc ! videoconvert ! v4l2sink device=/dev/video1
> --gst-debug=2

I am not sure how informative it is, but here it is:

% gst-launch-1.0 videotestsrc ! videoconvert ! v4l2sink
device=/dev/video1 --gst-debug=3

:(
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
0:00:00.024352275 9163 0x56274ab94d40 FIXME default
gstutils.c:3963:gst_pad_create_stream_id_internal:<videotestsrc0:src>
Creating random stream-id, consider implementing a deterministic way
of creating a stream-id
0:00:00.024924622 9163 0x56274ab94d40 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<videotestsrc0> error: Internal
data stream error.
0:00:00.024933407 9163 0x56274ab94d40 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<videotestsrc0> error: streaming
stopped, reason not-negotiated (-4)
ERROR: from element
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data
stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

On Fri, May 18, 2018 at 1:02 PM, Nicolas Dufresne <[hidden email]> wrote:
> V4L2loopback is very buggy, and causes random failures. This has been
> reported, but no fixes has been made.

I see, and I guess there are no alternatives to have a simple
controllable webcam?

My use case is that for some reasons few programs see my webcam
vertically flipped, so I would like to have a "normal" one and a
"flipped" one (via videoflip method=vertical-flip) so depending on the
program I can use the one I need.
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Nicolas Dufresne-5

Re: Playing around with gstreamer fails strangely

Le vendredi 18 mai 2018 à 14:07 +0200, Paolo Bolzoni a écrit :

> On Fri, May 18, 2018 at 11:45 AM, Vinod Kesti <[hidden email]> wrote:
> > Can you prove debug logs of the pipeline
> >
> > gst-launch-1.0 videotestsrc ! videoconvert ! v4l2sink device=/dev/video1
> > --gst-debug=2
>
> I am not sure how informative it is, but here it is:
>
> % gst-launch-1.0 videotestsrc ! videoconvert ! v4l2sink
> device=/dev/video1 --gst-debug=3
>
> :(
> Setting pipeline to PAUSED ...
> Pipeline is PREROLLING ...
> 0:00:00.024352275 9163 0x56274ab94d40 FIXME default
> gstutils.c:3963:gst_pad_create_stream_id_internal:<videotestsrc0:src>
> Creating random stream-id, consider implementing a deterministic way
> of creating a stream-id
> 0:00:00.024924622 9163 0x56274ab94d40 WARN basesrc
> gstbasesrc.c:3055:gst_base_src_loop:<videotestsrc0> error: Internal
> data stream error.
> 0:00:00.024933407 9163 0x56274ab94d40 WARN basesrc
> gstbasesrc.c:3055:gst_base_src_loop:<videotestsrc0> error: streaming
> stopped, reason not-negotiated (-4)
> ERROR: from element
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data
> stream error.
> Additional debug info:
> gstbasesrc.c(3055): gst_base_src_loop ():
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
> streaming stopped, reason not-negotiated (-4)
> ERROR: pipeline doesn't want to preroll.
> Setting pipeline to NULL ...
> Freeing pipeline ...
>
>
>
> On Fri, May 18, 2018 at 1:02 PM, Nicolas Dufresne <[hidden email]> wrote:
> > V4L2loopback is very buggy, and causes random failures. This has been
> > reported, but no fixes has been made.
>
> I see, and I guess there are no alternatives to have a simple
> controllable webcam?
>
> My use case is that for some reasons few programs see my webcam
> vertically flipped, so I would like to have a "normal" one and a
> "flipped" one (via videoflip method=vertical-flip) so depending on the
> program I can use the one I need.

That's interesting, I was looking for such cases recently. Do you mind
reporting the camera model and/or the laptop model ?
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Paolo Bolzoni-2

Re: Playing around with gstreamer fails strangely

On Fri, May 18, 2018 at 8:11 PM, Nicolas Dufresne <[hidden email]> wrote:
> That's interesting, I was looking for such cases recently. Do you mind
> reporting the camera model and/or the laptop model ?

lsusb -v states this:

Bus 003 Device 007: ID 0471:032e Philips (or NXP) SPC 315NC PC Camera
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0471 Philips (or NXP)
idProduct 0x032e SPC 315NC PC Camera
bcdDevice 1.00
iManufacturer 1
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 193
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0000 1x 0 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0080 1x 128 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 2
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 3
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0100 1x 256 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 4
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0180 1x 384 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 5
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 6
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0300 1x 768 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 7
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0380 1x 896 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
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