<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Noted. Thank you.<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On May 16, 2022, at 1:21 AM, Marianna Smidth Buschle via gstreamer-devel <<a href="mailto:gstreamer-devel_at_lists_freedesktop_org_59mnm7srbr1196_2a6d20b7@icloud.com" class="">gstreamer-devel_at_lists_freedesktop_org_59mnm7srbr1196_2a6d20b7@icloud.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class=""><p class="">I guess the main problem is that YUV generally defines the range
as 16-235.<br class="">
And so most of the available colorspaces have limited range
quantization.</p><p class="">As far as I can see only the JPEG colorspace defines full range
quantization:<br class="">
<a class="moz-txt-link-freetext" href="https://www.kernel.org/doc/html/v4.10/media/uapi/v4l/pixfmt-007.html#colorspace-jpeg-v4l2-colorspace-jpeg">https://www.kernel.org/doc/html/v4.10/media/uapi/v4l/pixfmt-007.html#colorspace-jpeg-v4l2-colorspace-jpeg</a></p><p class="">Perhaps you can see if it could be used.</p><p class=""><br class="">
</p><p class="">Though is not the same issue I have previously run into a related
problem with videoconvert:<br class="">
<a class="moz-txt-link-freetext" href="https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/issues/868">https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/issues/868</a></p><p class="">Which might give some clues.</p><p class=""><br class="">
</p><p class="">Otherwise you could make a simple contrast/intensity stretch
filter to put the range back to 0-255 (and possibly fix the
colorimetry CAPS as well).<br class="">
</p><p class=""><br class="">
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<div class="moz-cite-prefix">On 14.05.2022 14.00,
<a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel-request@lists.freedesktop.org">gstreamer-devel-request@lists.freedesktop.org</a> wrote:<br class="">
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<pre class="moz-quote-pre" wrap="">GStreamer team,
I am capturing video using a BlackMagic Video device, sending out using a VP9
encoder, and then using a payloader for use with webRTC. When I view the
stream, my blacks and whites are mapped 16-235 instead of 0-255. Is there a
way to correct this? WIth ffmpeg, I can use a filter graph and and set the
input and output scale ?scale=in_range=limited:out_range=limited?.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">I don't think our converters current handle this, but the range is part of the
colorimetry= filed in caps. Would be nice to fix this of course, range
conversion seems pretty handy.
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<pre class="moz-quote-pre" wrap="">Thanks,
Patrick
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<pre class="moz-signature" cols="72">--
Best regards / Med venlig hilsen
“Marianna Smidth Buschle”</pre>
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