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30th July 2012, 04:34 | #3 | Link |
The speed of stupid
Join Date: Sep 2011
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You could also think in another way, in SD - there are less pixels for the same amount of "space" compared to HD, so the artifacts at SD take up more of the actual space compared to HD.
Though I haven't experienced terrible results at --crf 20. |
30th July 2012, 07:47 | #5 | Link |
Registered User
Join Date: Dec 2002
Posts: 5,565
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As the others said: because of the resolution. x264 will use a much higher bitrate for the HD version at the same CRF and also artefacts would be less visible because of the smaller blocks (when displayed on the same screen).
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6th August 2012, 10:06 | #7 | Link |
Testeur de codecs
Join Date: May 2003
Location: France
Posts: 2,484
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It's Simple:
- Pixel number for HD is 5X higher - Size file for HD is 3-4X higher If you want compare HD and SD advantage, don't make encoding at same quality/pixel level (aka quantizer aka crf mode) but at same size level.
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Le Sagittaire ... ;-) 1- Ateme AVC or x264 2- VP7 or RV10 only for anime 3- XviD, DivX or WMV9 |
7th August 2012, 17:53 | #8 | Link | |
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Quote:
If you mean encoding HD at the same bitrate as SD, that would lower the quality of HD videos way too much. |
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7th August 2012, 22:39 | #9 | Link | |
Testeur de codecs
Join Date: May 2003
Location: France
Posts: 2,484
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Quote:
With good filtering, with good source, with H264, you can make high quality encoding at 720p and 1 Mbps with really better visual quality than 480p at 1 Mbps.
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Le Sagittaire ... ;-) 1- Ateme AVC or x264 2- VP7 or RV10 only for anime 3- XviD, DivX or WMV9 |
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