High quality video becomes pixelated?

keeves wrote on 4/2/2014, 1:17 AM
I enjoy editing TV show clips and putting them on youtube. I own a Sony Vaio laptop from 2011 that came with Vegas Movie Studio HD Platinum 10 and up till now it has served me well. After converting a clip from .mkv to .mp4 using the MKVtoMP4 program, the quality is fantastic in the video player on my computer. However, when I import it into Sony Vegas (though overall the quality is still fairly decent), little parts will become pixel-y for a short period of time. This happens repeatedly throughout the clip and is rather annoying. It also isn't just a display issue as it remains pixelated after I rendered it. Has anyone else encountered this problem? Also, if you have suggestions for how to solve it or need more information you'll probably have to explain in detail what I should do as I am not technologically savvy with computer terms :)

Comments

Steve Grisetti wrote on 4/2/2014, 7:34 AM
A lot depends on the specs of the MP4 you created. Converting one file format to another is always risky. There is more than one type of MP4, and you sometimes end up converting your video to a format that is less rather than more compatible with a video editor.

How are you getting .mkv video? What device is recording your TV shows, and at what resolution?

When you open one of the .mkv files in G Spot or Media Info, what specs show for the video resolution and video codec?
http://www.headbands.com/gspot/
musicvid10 wrote on 4/2/2014, 11:25 AM
"the quality is fantastic in the video player on my computer. However, when I import it into Sony Vegas (though overall the quality is still fairly decent), little parts will become pixel-y for a short period of time."

You are likely seeing transport stream errors that while usually corrected in a player, cannot be corrected when unpacking for editing or encoding.

To fix this, first run your broadcast streams through the Quickstream Fix utility in VideoRedo trial (version depends on your source, which you told us nothing about).

-- All transport streams contain errors.
-- Broadcast streams contain many errors.
-- Converting your video alone does nothing to the errors.
-- Decoders that unpack the streams for editing do not correct the errors.
-- Some decoders drop the bad frames, others just choke (you're lucky Vegas did not do the latter.