Thanks for your help. I am a bit further along but still cannot control the color space:
gst-launch -v videotestsrc ! ffmpegcolorspace ! 'video/x-raw-yuv,format=(fourcc)YUY2, width=640, height=480' ! v4l2loopback sync=false max-lateness=50000 device=/dev/video2
Opening video decoder: [raw] RAW Uncompressed Video
Movie-Aspect is undefined - no prescaling applied.
VO: [xv] 640x480 => 640x480 Planar I420
Selected video codec: [rawi420] vfm: raw (RAW I420)
----- Original Message -----
From: "Tim-Philipp Müller" <
[hidden email]>
To:
[hidden email]
Sent: Tuesday, September 11, 2012 5:08:34 PM
Subject: Re: New User Format Question
On Tue, 2012-09-11 at 16:51 -0700, Lawrence Anthony wrote:
Hi,
> I have the following pipeline that I want to output I420 (or any format other than YUY2) :
>
> gst-launch -v videotestsrc ! ffmpegcolorspace ! videoscale ! videorate ! 'video/x-raw-yuv,FORMAT=I420, width=640, height=480' ! v4l2loopback sync=false max-lateness=50000 device=/dev/video1
>
> But when I run the stream through mplayer it says it is YU12:
>
> Opening video decoder: [raw] RAW Uncompressed Video
> Movie-Aspect is undefined - no prescaling applied.
> VO: [xv] 640x480 => 640x480 Packed YUY2
> Selected video codec: [rawyuy2] vfm: raw (RAW YUY2)
>
>
> I cant make this value change no matter what colorspace I specify. Am I missing something simple here?
In 0.10 (you are using 0.10), you need to specify the yuv format as
format fourcc. The way you wrote it, the field type will be a string,
but the field names are also case sensitive, so your FORMAT= field will
just be ignored basically.
Try (note the ' '):
.. ! 'video/x-raw-yuv,format=(fourcc)I420,width=640,height=480' ! ...
In 1.0 it would be:
.. ! 'video/x-raw,format=(string)I420,width=640,height=480' ! ...
Cheers
-Tim
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