Transcoding Results in Blocky Output

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weatherman
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Transcoding Results in Blocky Output

Postby weatherman » 10 Jan 2009 16:53

Greetings!

I've been using VLC for about a year now and it has been very useful. I stream video from an HDHomerun box using the following parameters:

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vlc -I http --http-host xxx.xxx.xxx.xxx:8071 udp://\@:1231 --sout '#transcode{vcodec=mp4v,vb=2048,scale=0.50}:es{dst-audio=hwtvideoserver:8081,mux-audio=es,access-audio=http,dst-video=hwtvideoserver:8091,mux-video=ts,access-video=http}'
My first attempt at recording the stream was using the GUI and simply dumping the raw input (by clicking on the "Dump raw input" checkbox). I assume that the video container is TS and the codec is MPEG4. The video playback of the raw file in VLC is great.

It turns out that we would really like to use this video, but want to have it in a common format (wmv, mov, etc.) for editing. However, when I try to transcode it the output is blocky (large pixelization). (also, it can look "smeared")

I've tried wrapping it in ASF, and MOV while keeping the MPEG4 codec. I've tried tried changing the codec. I've used bitrates as high as 8192, and as low as 256 kb/s.

I recorded the stream with version 0.8.6d (the most up-to-date RedHat Enterprise Linux version available [unfortunately]) on a quadcore machine with 8 Gb RAM and an nVidia 8800GTX card. I've tried transcoding the video using a myriad of machines (windoze core2 duo with 2 Gb RAM and nVidia 7900 GS card; dual quad-core linux with 8 32 Gb RAM and 9800 GTX card; and variations in between) and both the VLC 0.8.6d version for linux as well as the 0.9.4 version for windoze.

I've been looking through this forum for several months and haven't seemed to find a fix that helps. If anyone can provide some insight, I'd be very grateful!

Many thanks!

-kevin.

weatherman
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Re: Transcoding Results in Blocky Output

Postby weatherman » 14 Jan 2009 16:12

Ahhhh - looks like I finally :banghead: found the answer to my question:

viewtopic.php?f=2&t=39292&p=122755&hili ... ty#p122755

mencode did the trick for me.

-kevin.


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