decklink plugin

[Mitchell Foley]

I've had problems using xvideosink with decklinksrc, which might be what
autovideosink is loading. For me, this command works fine:

gst-launch-1.0 decklinksrc connection=HDMI mode=11 name=demux demux. !
alsasink sync=false demux. ! queue ! xvimagesink sync=false

-Mitch


On Wed, Mar 26, 2014 at 6:24 AM, Krzysztof Borowczyk <
k.borowczyk at samsung.com> wrote:

>  Update:
>
>
>
> The queue problem was that it connected to the audio output, I fixed it
> by running:
>
> gst-launch-1.0 decklinksrc name=d mode=9 connection=1  d. ! queue  !
>  fakesink d. ! queue ! videoconvert ! autovideosink
>
> unfortunately the problem still persists - I get the playback at 1-2
> frames per second.
>
>
>
> *From:* gstreamer-devel [mailto:
> gstreamer-devel-bounces at lists.freedesktop.org] *On Behalf Of *Krzysztof
> Borowczyk
> *Sent:* Wednesday, March 26, 2014 10:44 AM
> *To:* 'Discussion of the development of and with GStreamer'
> *Subject:* RE: decklink plugin
>
>
>
> [...]
>
>
>
> Try turning on debug for the decklinksrc:
>
>
>
>     GST_DEBUG=decklinksrc:6 gst-launch-1.0 ...
>
>
>
> That will tell you if it is having to drop frames because the pipeline
>
> isn't receiving them fast enough. If that's the case try adding a queue
>
> after decklinksrc (?).
>
>
>
> I tried with these logs, and decklink doesn't say anything about dropping
> frames - quite the opposite, it reports Valid Frame (log.txt):
>
>
> :00:02.684938080  2552  0x8163120 DEBUG            decklinksrc
> capture.cpp:114:VideoInputFrameArrived:<decklinksrc0> Frame received [No
> timecode] - Valid Frame - Size: 4147200 bytes
>
> 0:00:02.688372967  2552  0x815dbb0 DEBUG            decklinksrc
> gstdecklinksrc.cpp:746:gst_decklink_src_task:<decklinksrc0> task
>
> 0:00:02.718353360  2552  0x8163120 DEBUG            decklinksrc
> capture.cpp:114:VideoInputFrameArrived:<decklinksrc0> Frame received [No
> timecode] - Valid Frame - Size: 4147200 bytes
>
> 0:00:02.721746566  2552  0x815dbb0 DEBUG            decklinksrc
> gstdecklinksrc.cpp:746:gst_decklink_src_task:<decklinksrc0> task
>
> although, I'm not sure if the "No timecode" is expected here? Maybe that's
> the reason for drops?
>
>
>
> You could also try "autovideosink sync=false" and see what happens (you
>
> probably don't want to do that in practice, but trying it might give some
>
> insight as to what's causing your low framerate).
>
>
>
> Setting the sync to false helps. The playback is not 100% smooth, but it's
> much better.
>
>
>
> Maybe also try with fakesink, to eliminate videoconvert and your video
>
> sink from the equation: gst-launch-1.0 decklinksrc mode=... ! fakesink
>
>
>
> This also seems to help, there are no messages about dropped buffers.
>
>
>
> I don't know if the queue solution would help, because GStreamer does not
> want to connect it (log2.txt):
>
>
>
> WARNING: erroneous pipeline: could not link queue0 to videoconvert0
>
>
>
> Any idea why it would do so?
>
>
>
> --
>
> Best regards,
> Krzysztof Borowczyk
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20140326/18f9f62e/attachment.html>