* V4L2 logging for multiple streams
@ 2021-01-16 4:33 Fritz Koenig
2021-01-20 10:07 ` Kieran Bingham
2021-01-28 21:44 ` Nicolas Dufresne
0 siblings, 2 replies; 5+ messages in thread
From: Fritz Koenig @ 2021-01-16 4:33 UTC (permalink / raw)
To: Linux Media Mailing List
Hi,
I'm trying to sort some issues with regards to decoding multiple
streams at once. Logging can be helpful with messages like this:
[105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
but when I have:
[105188.498697] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
[105188.498715] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
[105188.499116] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
[105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
[105188.500467] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
[105188.500611] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
[105188.501879] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
[105188.502276] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
[105188.502331] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
I can't tell which stream VIDIOC_STREAMOFF is associated with. Is
there a logging option that I'm missing that would help indicate which
stream that ioctl is associated with.
Thanks.
-Fritz
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: V4L2 logging for multiple streams
2021-01-16 4:33 V4L2 logging for multiple streams Fritz Koenig
@ 2021-01-20 10:07 ` Kieran Bingham
2021-02-06 0:59 ` Fritz Koenig
2021-01-28 21:44 ` Nicolas Dufresne
1 sibling, 1 reply; 5+ messages in thread
From: Kieran Bingham @ 2021-01-20 10:07 UTC (permalink / raw)
To: Fritz Koenig, Linux Media Mailing List
Hi Fritz,
On 16/01/2021 04:33, Fritz Koenig wrote:
> Hi,
>
> I'm trying to sort some issues with regards to decoding multiple
> streams at once. Logging can be helpful with messages like this:
>
> [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
>
The type is telling you useful information there, is that what you are
after?
> but when I have:
>
> [105188.498697] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> [105188.498715] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> [105188.499116] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> [105188.500467] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> [105188.500611] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> [105188.501879] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> [105188.502276] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> [105188.502331] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
>
> I can't tell which stream VIDIOC_STREAMOFF is associated with. Is
> there a logging option that I'm missing that would help indicate which
> stream that ioctl is associated with.
The type expresses if it's from an output queue or a capture queue.
type=vid-out-mplane : Output queue
type=vid-cap-mplane : Capture queue
That's not so helpful/useful on the UNSUBSCRIBE_EVENT lines though, but
your specific request is regarding STREAMOFF.
I hope that helps you read the logs a little.
--
Kieran
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: V4L2 logging for multiple streams
2021-01-20 10:07 ` Kieran Bingham
@ 2021-02-06 0:59 ` Fritz Koenig
0 siblings, 0 replies; 5+ messages in thread
From: Fritz Koenig @ 2021-02-06 0:59 UTC (permalink / raw)
To: kieran.bingham+renesas; +Cc: Linux Media Mailing List
On Wed, Jan 20, 2021 at 2:07 AM Kieran Bingham
<kieran.bingham+renesas@ideasonboard.com> wrote:
>
> Hi Fritz,
>
> On 16/01/2021 04:33, Fritz Koenig wrote:
> > Hi,
> >
> > I'm trying to sort some issues with regards to decoding multiple
> > streams at once. Logging can be helpful with messages like this:
> >
> > [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> >
>
> The type is telling you useful information there, is that what you are
> after?
>
Sorry, I don't think I explained it well. Here I'm decoding 3
different streams at the same time, say 1080x720, 640x480, and
320x240. Nothing that denotes which is which is present in this level
of logging. I understand the distinction between the CAPTURE and
OUTPUT queues. I have found that at least for the venus driver, that
information is not exported anywhere.
This was also meant as a more general question of how to separate the
debugging information. I've done that by creating trampoline
functions that print out the context information before calling
v4l2_m2m_ioctl_streamon/v4l2_m2m_ioctl_streamoff etc. But it's a
patch that I have to maintain locally.
-Fritz
> > but when I have:
> >
> > [105188.498697] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.498715] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> > [105188.499116] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.500467] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> > [105188.500611] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.501879] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.502276] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.502331] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> >
> > I can't tell which stream VIDIOC_STREAMOFF is associated with. Is
> > there a logging option that I'm missing that would help indicate which
> > stream that ioctl is associated with.
>
> The type expresses if it's from an output queue or a capture queue.
>
> type=vid-out-mplane : Output queue
> type=vid-cap-mplane : Capture queue
>
>
> That's not so helpful/useful on the UNSUBSCRIBE_EVENT lines though, but
> your specific request is regarding STREAMOFF.
>
> I hope that helps you read the logs a little.
>
> --
> Kieran
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: V4L2 logging for multiple streams
2021-01-16 4:33 V4L2 logging for multiple streams Fritz Koenig
2021-01-20 10:07 ` Kieran Bingham
@ 2021-01-28 21:44 ` Nicolas Dufresne
2021-02-01 18:53 ` Fritz Koenig
1 sibling, 1 reply; 5+ messages in thread
From: Nicolas Dufresne @ 2021-01-28 21:44 UTC (permalink / raw)
To: Fritz Koenig, Linux Media Mailing List
Le vendredi 15 janvier 2021 à 20:33 -0800, Fritz Koenig a écrit :
> Hi,
>
> I'm trying to sort some issues with regards to decoding multiple
> streams at once. Logging can be helpful with messages like this:
>
> [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
>
> but when I have:
>
> [105188.498697] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> [105188.498715] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> [105188.499116] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> [105188.500467] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> [105188.500611] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> [105188.501879] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> [105188.502276] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> [105188.502331] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
>
> I can't tell which stream VIDIOC_STREAMOFF is associated with. Is
> there a logging option that I'm missing that would help indicate which
> stream that ioctl is associated with.
I suppose this is m2m driver ? I think it would be nice to trace some instance
ID, otherwise indeed, if you have two stream on the same m2m device node, the
traces get confused.
>
> Thanks.
>
> -Fritz
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: V4L2 logging for multiple streams
2021-01-28 21:44 ` Nicolas Dufresne
@ 2021-02-01 18:53 ` Fritz Koenig
0 siblings, 0 replies; 5+ messages in thread
From: Fritz Koenig @ 2021-02-01 18:53 UTC (permalink / raw)
To: Nicolas Dufresne; +Cc: Linux Media Mailing List
On Thu, Jan 28, 2021 at 1:45 PM Nicolas Dufresne <nicolas@ndufresne.ca> wrote:
>
> Le vendredi 15 janvier 2021 à 20:33 -0800, Fritz Koenig a écrit :
> > Hi,
> >
> > I'm trying to sort some issues with regards to decoding multiple
> > streams at once. Logging can be helpful with messages like this:
> >
> > [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> >
> > but when I have:
> >
> > [105188.498697] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.498715] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> > [105188.499116] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.500450] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.500467] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> > [105188.500611] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.501879] video2: VIDIOC_UNSUBSCRIBE_EVENT: type=0x5, id=0x0, flags=0x0
> > [105188.502276] video2: VIDIOC_STREAMOFF: type=vid-out-mplane
> > [105188.502331] video2: VIDIOC_STREAMOFF: type=vid-cap-mplane
> >
> > I can't tell which stream VIDIOC_STREAMOFF is associated with. Is
> > there a logging option that I'm missing that would help indicate which
> > stream that ioctl is associated with.
>
> I suppose this is m2m driver ? I think it would be nice to trace some instance
> ID, otherwise indeed, if you have two stream on the same m2m device node, the
> traces get confused.
>
Yes, m2m. Instance doesn't seem to be a concept at that level. The
driver itself holds an idea of instances (at least on venus). I was
able to add debugging to trace instances in vdec.c, but I don't see a
generic way to add it.
-Fritz
>
> >
> > Thanks.
> >
> > -Fritz
>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-02-06 3:23 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-16 4:33 V4L2 logging for multiple streams Fritz Koenig
2021-01-20 10:07 ` Kieran Bingham
2021-02-06 0:59 ` Fritz Koenig
2021-01-28 21:44 ` Nicolas Dufresne
2021-02-01 18:53 ` Fritz Koenig
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.