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A little guidance regarding scale down resolutions
Hello
Just curious if what I’m doing is a good general workflow or…are there alternatives?
When I encode standard definition clips for computer playback, web or CDROM, I usually do a proportional scale down, depending on the job specifications. For example: Master video is PAL 720 x 576 with a proportional scale down to the following resolutions:
75% of source 540 x 432
50% of source 360 x 288
25% of source 180 x 144I guess it’s the same workflow for HD clips. So
1280 x 720
75% of source 960 x 540
50% of source 640 x 360
25% of source 320 x 180I guess I can also calculate based off aspect ratio –
Multiply the desired height or width by 1.778 or .5625 (for 16:9 material)What’s the question???
Hmmm…Does the above sound logical? Can I be doing something wrong?
Daniel
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1 Reply
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Your standard def aspect ratios are wrong. Remember that 720×576 is 4:3 (1.333) using non-square pixels. Web CDROM etc all use square pixels.
Although the following link relates to flash video, the frame size tables are relevant for all square pixel delivery formats:
https://blog.influxis.com/influxis/?p=14
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Please post back saying what solved your problem. It could help others, and saying ‘thanks’ is free!
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