Grass Valley ProCoder 3 - Manual (Page 117)

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ProCoder 3
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Using ProCoder
Helpful Hints
ProCoder Reference
Glossary
Index
117
Improving your Video
Video appears stretched or squashed
> Result > Original image
The video appears to be stretched in one direction. Circles now appear as ovals and people
are taller or wider than they should be.
Cause: Widescreen MPEG-2 output
If your output is widescreen MPEG-2, then this is not a problem. Some MPEG-2
playback software does not properly size the video playback according to the aspect
ratio set in the MPEG-2 file. Thus, widescreen MPEG-2 files play back squashed.
Authoring a widescreen DVD using this file and playing that DVD on a DVD player will
produce a correct widescreen result.
Cause: Player does not compensate for pixel and frame aspect ratio
Some media players do not compensate for video with non-square pixels and thus do
not display video in the proper aspect ratio. This is not a problem with the encoding
or ProCoder, it is a problem with the player. Try to find a player that properly
compensates for non-square pixel playback.
Cause: Incorrect source aspect ratio setting
Check the aspect ratio setting in your source file. If it is set incorrectly, ProCoder will
interpret the shape of the video image incorrectly and therefore process it incorrectly.
ProCoder never does anything to stretch or squash the image – widescreen sources
converted to standard screen size will be scaled to fit into the standard width, a
process known as letterboxing, as shown in the image below.
> 4:3 Letterboxed video
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