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Thursday 30.1.2025 / 13:12
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afterdawn.com > forums > archived forums > divx / xvid > mpeg-4 - how much compression.
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MPEG-4 - How much compression.
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gmannel
Newbie
_ 		3. November 2005 @ 16:20 _ Link to this message    Send private message to this user   
What is the sweet spot for MPEG-4 compression? For example, in the case of having ripped a full length modern movie feature to your HD w/ DVD Decrypter in file mode, and then using say Nero Recode 2(or XviD) to convert to MPEG-4, you are given a choice of final target size anywhere from 1 CD at "video quality" level of 568 Kbps to 867 Kbps for a 1 Gb file to a max of 4 Mbps for say a DVD-5. Playing back on an Oppo DVD player to a standard def 60 inch RPTV, at what "video qulality" point would the difference between the original DVD and the MPEG-4 backup become apparent? If I burn to a single layer DVD-5 then the max quality is no problem but if I want to save many movies to a HD array then it would be advantageous to keep the file size to say 1 or 2 Gb if I don't degrade the image(much). Thanks
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celtic_d
AfterDawn Addict
_ 		3. November 2005 @ 17:40 _ Link to this message    Send private message to this user   
If you aren't targeting a specific filesize then encode using constant quant mode. The lower the average quant, the higher the quality and the higher the bitrate used. Otherwise 2 pass encoding with the bitrate based on the size of the first pass. Say 60-80% of the first pass (which is Q2 for XviD).
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gmannel
Newbie
_ 		4. November 2005 @ 16:27 _ Link to this message    Send private message to this user   
Does Nero Recode 2 allow constant quant mode? I guess my question would be more clearly stated as "what is the minimum bitrate I should use for quality playback?"
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