x264 [error]: baseline profile doesn't support 4:2:2

[Dengke Du]

Hi all

Gstreamer version: 1.14.2

My problem:

test-launch program from gst-rtsp-server-1.14.2

$ GST_DEBUG=2 ./test-launch "( v4l2src ! 
video/x-raw,format=YUY2,width=640,height=480 ! videoconvert ! x264enc ! 
rtph264pay name=pay0 pt=96 )"

stream ready at rtsp://127.0.0.1:8554/test
x264 [error]: baseline profile doesn't support 4:2:2
0:00:04.580719380 782721 0x7f2e3801a0f0 WARN x264enc 
gstx264enc.c:1807:gst_x264_enc_init_encoder:<x264enc0> Bad downstream 
profile name: baseline
0:00:05.359546191 782721 0x7f2e3801a0f0 WARN v4l2src 
gstv4l2src.c:976:gst_v4l2src_create:<v4l2src0> lost frames detected: 
count = 1 - ts: 0:00:00.776213683
0:00:07.479041838 782721       0x6d0590 WARN rtspmedia 
rtsp-media.c:3861:gst_rtsp_media_suspend: media 0x7f2e4003c2d0 was not 
prepared
0:00:20.580574293 782721       0x6d0590 WARN rtspmedia 
rtsp-media.c:4143:gst_rtsp_media_set_state: media 0x7f2e4003c2d0 was not 
prepared

My device:

$ v4l2-ctl --list-formats

ioctl: VIDIOC_ENUM_FMT
     Index       : 0
     Type        : Video Capture
     Pixel Format: 'YUYV'
     Name        : YUYV 4:2:2

     Index       : 1
     Type        : Video Capture
     Pixel Format: 'MJPG' (compressed)
     Name        : Motion-JPEG

-----------------------------------------------------------------------

I searched in gst-plugins-ugly-1.14.2:  ext/x264/gstx264enc.c:

https://cgit.freedesktop.org/gstreamer/gst-plugins-ugly/tree/ext/x264/gstx264enc.c?h=1.14#n2282

The encoder's peer_profile was set as 'baseline' according to |[ 
GstVideoCodecState * state ] from the previous element.|

|and in x264 source code:|

|https://github.com/mirror/x264/blob/master/common/base.c#L721|

|The x264 compare the profile and i_csp, found missing pair, so give the 
"x264 [error]: baseline profile doesn't support 4:2:2"
|

|I was strange if the device give the missing pair from v4l2src element?
|

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