<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<br>
<div class="moz-cite-prefix">Dňa 11.08.2014 o 14:27 007GK
napísal(a):<br>
</div>
<blockquote
cite="mid:d6c24e74-b26e-4228-b78c-3cb0dcb024f1@googlegroups.com"
type="cite">
<div dir="ltr">
<style type="text/css">P { margin-bottom: 0.08in; }</style>
<p style="margin-bottom: 0in">Hi,</p>
<p style="margin-bottom: 0in"><br>
</p>
<p style="margin-bottom: 0in">I was trying gstreamer with
various plugin/elements and could not understand few basic
terms.</p>
<p style="margin-bottom: 0in">
<style type="text/css">P { margin-bottom: 0.08in; }</style>
</p>
<p style="margin-bottom: 0in">1. When to use sync=false,
sync=true, sync=1 with sink elements?<br>
</p>
<p style="margin-bottom: 0in">
</p>
<p style="margin-bottom: 0in">2. When to use autovideosink?</p>
<p style="margin-bottom: 0in">3. Which is the demuxer to be used
with
decklinksrc?</p>
</div>
</blockquote>
decklinksrc output raw video/audio streams so no demuxes are needed.<br>
<blockquote
cite="mid:d6c24e74-b26e-4228-b78c-3cb0dcb024f1@googlegroups.com"
type="cite">
<div dir="ltr">
<p style="margin-bottom: 0in">4. What is ffmpegcolorspace
element?</p>
</div>
</blockquote>
it convert video frames from one color space or format to another.
in this case from UYVU to I420<br>
<blockquote
cite="mid:d6c24e74-b26e-4228-b78c-3cb0dcb024f1@googlegroups.com"
type="cite">
<div dir="ltr">
<p style="margin-bottom: 0in">5. For below pipeline gst-launch
errors out saying :
WARNING: erroneous pipeline: could not link queue0 to
audioconvert0
</p>
<p style="margin-bottom: 0in">gst-launch \
</p>
<p style="margin-bottom: 0in"> decklinksrc mode=18
connection=composite name=demux \
</p>
<p style="margin-bottom: 0in"> demux. ! queue ! audioconvert !
audiorate ! vorbisenc ! mux. \
</p>
<p style="margin-bottom: 0in"> demux. ! queue ! ffmpegcolorspace
!
'video/x-raw-yuv' ! vp8enc speed=7 ! mux. \
</p>
<p style="margin-bottom: 0in"> webmmux name=mux ! filesink
location=s.webm </p>
<p style="margin-bottom: 0in"><br>
</p>
<p style="margin-bottom: 0in">but below command works:<br>
</p>
<p style="margin-bottom: 0in">gst-launch \
</p>
<p style="margin-bottom: 0in"> decklinksrc mode=18
connection=composite name=demux \
</p>
<p style="margin-bottom: 0in"> demux. ! queue ! ffmpegcolorspace
!
'video/x-raw-yuv' ! vp8enc speed=7 ! mux. \
</p>
<p style="margin-bottom: 0in"> demux. ! queue ! audioconvert !
audiorate ! vorbisenc ! mux. \
</p>
<p style="margin-bottom: 0in"> webmmux name=mux ! filesink
location=newfile.webm </p>
<p style="margin-bottom: 0in">
</p>
<br>
<p style="margin-bottom: 0in">I have just swapped video/audio
components.. <br>
</p>
</div>
</blockquote>
it may be bug in gstreamer. I recomend upgrade to gstreamer 1.4 as
old 0.10 is not maintained.<br>
<blockquote
cite="mid:d6c24e74-b26e-4228-b78c-3cb0dcb024f1@googlegroups.com"
type="cite">
<div dir="ltr">
<p style="margin-bottom: 0in"><br>
</p>
<p style="margin-bottom: 0in">Thanks,</p>
<p style="margin-bottom: 0in">Sneha<br>
</p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
gstreamer-devel mailing list
<a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a>
<a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a>
</pre>
</blockquote>
<br>
</body>
</html>