Ola Christoffersson
November 22nd, 2007, 06:40 AM
I have been thinking about something that I do not think has been up for discussion. Maybe because it is obvious for everybody but I would be interested to hear your thoughts on this:
As the HQ mode seems to use approximately the same bandwith regardless of recording mode (judging from the "tennis files" and the "street files" posted) should this not mean that some modes will suffer much less from compression artifacts than other?
For example wouldn't 720P50 be twice as hard compression per frame compared to 720P25? This would probably be visible if this is indeed how it works. Maybe someone would care to make a test? This could tell us a lot about how good the codec really is. If 50P is very similar to 25P that would tell us that there is quite a lot of headroom for fast movements etc in 25P-mode.
Also 1080P25 contains 2,25 times as much raw data as 720P25. This should effect compression results, right? So - does this mean that it is better to record 720P if the end result is going to be 720P or is scaling down 1080P equally good?
I'd be interested to hear your thoughts on this and also see some tests if someone feels up for it. I am afraid that I don't have a camera (yet) to do this.
/ola
As the HQ mode seems to use approximately the same bandwith regardless of recording mode (judging from the "tennis files" and the "street files" posted) should this not mean that some modes will suffer much less from compression artifacts than other?
For example wouldn't 720P50 be twice as hard compression per frame compared to 720P25? This would probably be visible if this is indeed how it works. Maybe someone would care to make a test? This could tell us a lot about how good the codec really is. If 50P is very similar to 25P that would tell us that there is quite a lot of headroom for fast movements etc in 25P-mode.
Also 1080P25 contains 2,25 times as much raw data as 720P25. This should effect compression results, right? So - does this mean that it is better to record 720P if the end result is going to be 720P or is scaling down 1080P equally good?
I'd be interested to hear your thoughts on this and also see some tests if someone feels up for it. I am afraid that I don't have a camera (yet) to do this.
/ola