x264enc changing chroma-site from mpeg2 -> jpeg

[vanderhoffer]

Hi All,

I have built a pipeline in C connecting
videoconverter -> capsfilter -> x264enc -> flvmux

according to the DOT file, going into the x264enc I have
format : I420
chroma-site: mpeg2

coming out I have
chroma-site: jpeg

Can anyone tell me what chroma-site does and what is the g_object to change it back to mpeg2?


Thx
Art

[Nicolas Dufresne-5]

Le lundi 16 janvier 2017 à 09:12 -0800, vanderhoffer a écrit :

> Hi All,
>
> I have built a pipeline in C connecting 
> videoconverter -> capsfilter -> x264enc -> flvmux
>
> according to the DOT file, going into the x264enc I have
> format : I420
> croma-site: mpeg2
>
> coming out I have 
> croma-site: jpeg
>
> Can anyone tell me what croma-site does and what is the g_object to
> change
> it back to mpeg2?

What version of GStreamer is this ? The encoder should simply drop the
chroma-site field. This works for me in 1.10.2

gst-launch-1.0 -v videotestsrc ! video/x-raw,chroma-site=mpeg2 ! x264enc ! fakesink
/GstPipeline:pipeline0/GstX264Enc:x264enc0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, level=(string)2, profile=(string)high, width=(int)320, height=(int)240, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1

The chroma-site indicate which method shall be used to calculate the
chroma value of sub-sampled formats (like I420). See Wim's talks for
details:

https://gstconf.ubicast.tv/videos/image-conversion/

>
>
> Thx
> Art
>
>
>
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