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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I will be relying on FFMPEG. I usually
write my own packetizers and depacketizers when they are not available. The
whole thing will be in Java (other than the native code calls).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Andrew </span></font><font size=2
color=navy face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings;
color:navy'>J</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
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<p><font size=2 color=navy face="Times New Roman"><span style='font-size:10.0pt;
color:navy'>---------------------------------------------------------<br>
<br>
Andrew G D Rowley<br>
Senior Development Officer<br>
<br>
Research Computing Services<br>
The <st1:place w:st="on"><st1:PlaceType w:st="on">University</st1:PlaceType>
of <st1:PlaceName w:st="on">Manchester</st1:PlaceName></st1:place><br>
<st1:place w:st="on">Devonshire</st1:place> House, <st1:Street
w:st="on"><st1:address w:st="on">Oxford Road</st1:address></st1:Street><br>
<st1:place w:st="on"><st1:City w:st="on">Manchester</st1:City>, <st1:PostalCode
w:st="on">M13 9PL</st1:PostalCode></st1:place><br>
<br>
t : +44 (0) 161 275 0685<br>
e : Andrew.Rowley@manchester.ac.uk<br>
w : www.manchester.ac.uk/researchcomputing<br>
<br>
---------------------------------------------------------</span></font><font
color=navy><span style='color:navy'> </span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
adhesionmusic@gmail.com [mailto:adhesionmusic@gmail.com] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Andrew Ford<br>
<b><span style='font-weight:bold'>Sent:</span></b> 25 November 2009 20:00<br>
<b><span style='font-weight:bold'>To:</span></b> Piers O'Hanlon;
Andrew.Rowley@manchester.ac.uk<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">wg-multicast@internet2.edu</st1:PersonName>;
<st1:PersonName w:st="on">ag-dev@mcs.anl.gov</st1:PersonName>; <st1:PersonName
w:st="on">asaeda@sfc.wide.ad.jp</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [AG-DEV] Transcoding
DVTS streams?</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Hi,<br>
<br>
To clarify, like others said, ffmpeg can decode the DV codec in general (ie,
you can plug a camera in and view it) but it apparently can't depacketize DVTS,
since when you try to receive a DVTS stream it just looks like noise. VLC can
do neither as far as I can tell.<br>
<br>
Piers - thanks for the info, I'll give gstreamer a try.<br>
<br>
Andrew - what are you using as the backend for this transcoding tool? Is it all
custom-written or do you rely on libraries like ffmpeg?<br>
<br>
--Andrew<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2009/11/25 Piers O'Hanlon <<a href="mailto:p.ohanlon@cs.ucl.ac.uk">p.ohanlon@cs.ucl.ac.uk</a>><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi Andrew,<br>
<br>
Another way you could probably knock something up quickly is using<br>
gstreamer - v0.10 contains a DV de/payloader:<br>
<br>
%gst-inspect-0.10 | grep "dv:"<br>
typefindfunctions: video/x-dv: dif, dv<br>
dv: dvdemux: DV system stream demuxer<br>
dv: dvdec: DV video decoder<br>
ffmpeg: ffdemux_dv: FFmpeg DV video format demuxer<br>
ffmpeg: ffmux_dv: FFmpeg DV video format muxer<br>
<br>
You could play with creating a pipeline using gst-launch-0.10 to do<br>
what you want or you can write a small app in Python or C++ using the<br>
gstreamer libraries.<br>
<br>
Piers<br>
<br>
2009/11/24 Andrew Ford <<a href="mailto:andrew.ford@rit.edu">andrew.ford@rit.edu</a>>:<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>> Hi,<br>
><br>
> Has anyone attempted or found a way to transcode a DVTS stream directly
off<br>
> of receiving it via multicast? My goal is to be able to transcode DVTS<br>
> streams to different formats and resend them as Access Grid-based or<br>
> web-based streams. So far, it looks like the only way to do it would be to<br>
> modify xdvshow or one of the other DVTS apps to hook together with ffmpeg<br>
> for transcoding & ffserver for streaming, since as far as I can tell,
apps<br>
> like ffmpeg or VLC can't receive DVTS by themselves. Before I go spending
a<br>
> bunch of time on that I want to make sure this hasn't already been done
some<br>
> other way.<br>
><br>
> Thanks,<br>
> --Andrew<br>
><o:p></o:p></span></font></p>
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