3 improving your video, Video is blocky or appears to break up, Cause: dvd media reading problem – Grass Valley ProCoder 3 User Manual
Page 110: Cause: use of seek or trick-play in the player, Improving your video
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ProCoder 3
3
Improving your Video
Even when using an intelligent tool like ProCoder, sometimes things just don’t seem quite
right. This section illustrates some common video encoding problems and how you can fix
or avoid them.
Video is blocky or appears to break up
> Result
> Original image
The video image appears to break up into different moving blocks. Parts of previous video
may appear in different locations. Notice in the example that elements of the correct video
seem to be mixed with the older video. After some time, the image may recompose itself,
producing a correct image.
Cause: DVD media reading problem
If you are seeing this type of problem after authoring a DVD and playing it back on a
set-top DVD player, it could simply be a difficulty reading the DVD-recordable media.
Try the same disc in a computer-based DVD player. If it plays in the computer without
problems, try a different set-top player or a different brand or type of DVD-recordable
disc. Many set-top players cannot reliably play all DVD-recordable discs.
Cause: Use of seek or trick-play in the player
If you were playing the file and playback was okay until you used the player’s fast-
forward, rewind or scrubber to reposition the playback location, then it’s probably not
a problem at all. Depending on the format and player, the video may take until the
next keyframe to start displaying properly. Try letting the file play through from start
to end without interrupting it to verify. If the video displays correctly in a straight-
through playback, then the output file is fine.