Multiple H264 cameras to MKV (GST1.1.2)

[Adam Goodwin]

Ok, thanks for the info. I'll just deal with it for now then I suppose.


On Mon, Sep 9, 2013 at 9:05 AM, Robert Krakora <
rob.krakora at messagenetsystems.com> wrote:

> Hi Adam,
>
> I echo Tim's comments...plus, there are a lot of unneeded memory copies
> occurring in v4l2src which pushes up CPU consumption (30->40% CPU usage per
> C920 v4l2src instance).  I hacked the v4l2src code and was able to get the
> CPU consumption down to the levels of GStreamer 0.10 v4l2src at about
> 8->15% CPU usage.  I think that there is work being done to rectify this.
>
> Best Regards,
>
> Rob Krakora
>
>
>
> On Sun, Sep 8, 2013 at 2:17 PM, Tim-Philipp Müller <t.i.m at zen.co.uk>wrote:
>
>> On Sun, 2013-09-08 at 21:24 +1200, Adam Goodwin wrote:
>>
>> Hi Adam,
>>
>> > I have a pipeline in a C application which I've noticed doesn't work
>> > smoothly with more than one camera.
>> >
>> >
>> > Currently I'm using two Logitech C920 cameras (with hardware H264
>> > encoding) in a pipeline which has these branches from the two cameras:
>> >
>> >
>> > v4l2src--->queue--->capsfilter--->h264parse--->tee--->
>> >
>> >
>> > v4l2src--->queue--->capsfilter--->h264parse--->tee--->
>> >
>> >
>> > After the tees, there are these two branches:
>> >
>> >
>> > --->queue--->rtph264pay--->udpsink
>> >
>> >
>> >
>> > --->matroskamux--->queue--->filesink
>> >
>> >
>> > Each tee feeds into the matroskamux branch, which creates a file with
>> > (in this case) two video streams. Only one of the tees is linked to
>> > the network streaming branch at a time (the user can switch the linked
>> > tee when the application runs).
>> >
>> >
>> > What I notice is that the program runs fine, and terminates fine when
>> > the user forces an EOS, but the received video (from over the network,
>> > currently just to 127.0.0.1) has quite a lot of artifacts.
>> >
>> > When I open the resulting MKV file (with VLC) the two video streams
>> > are displayed. However, there are similar artifacts to those seen when
>> > displaying the video live from UDP/RTP. The video also hangs for a few
>> > frames periodically, maybe once every couple of seconds. Finally, the
>> > timing is also wrong for the MKV.
>> >
>> > For example, in a 47 second video, VLC kept track of the current time
>> > correctly up until 8 seconds in. Then the time displayed by VLC got
>> > stuck at 48 seconds(!) while the progress bar for the video continued
>> > to show the correct stream position right up until the video ended
>> > after 47 seconds.
>> >
>> >
>> > None of these problems happen with either the RTP stream or the MKV
>> > file when only one camera is connected and used. (Well, the MKV
>> > playback getting stuck on the same frame every few seconds still
>> > happens, but that's the least of my problems).
>> >
>> >
>> > Does anyone have any ideas what could be wrong? I thought it could be
>> > something to do with not having enough threads, which I've read can be
>> > a problem with a branching pipeline, but each branch has a queue
>> > element so I don't know what else to do.
>>
>> Maybe it's related to
>>
>> https://bugzilla.gnome.org/show_bug.cgi?id=706083
>>
>> only that running it with two cameras increases the chances of it
>> happening?
>>
>> Cheers
>>  -Tim
>>
>>
>> _______________________________________________
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>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>
>
>
> --
>
> Rob Krakora,
> Senior Software Engineer
>
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