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6th January 2013, 07:45 | #1 |
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Video Quality - Resolution Vs. Bitrate
I used to look at a video's resolution - i.e. 480, 720, 1080p etc. when trying to get a feel for a clips quality, but recently I've started to appreciate that the bitrate is an extremely important element. I've seen some clips with a resolution of 480p that have excellent quality but they have a high bitrate, and I also have some 1080p clips that are extremely poor but they have quite a low bitrate.
I understand resolution reasonably well, but I really don't understand how bitrate works - i.e. how a higher bitrate improves quality. I've tried to read up online, but most of the stuff I've read is so technical I can't really understand it. Can anyone explain for me how bitrate works in language suitable for a relatively intelligent chimpanzee. For example I have the same video clip encoded at different resolutions. Herre are the specs: Version A. 1.62Gb, 720p, 7189kbps total bitrate. Version B. 2.11Gb, 1080p, 5179kbps total bitrate. From a purely technical view point which one would have the best quality? TIA |
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6th January 2013, 08:46 | #2 |
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OK, sorry but I'm going to make this more complicated.
What file type and codec? i.e. avi with xvid, wmv with WMV3, mkv with AVC. What fps (frames per second)? i.e. 23.97, 25, 29.97, 30, 60. How was it and how many times was it transcoded (converted from one type or resolution to another)? I guess what I'm saying is, especially downloading from a forum, you never can really tell until you see it.
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6th January 2013, 09:30 | #3 | |
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Version A. .wmv, 1.62Gb, 720p, 7189kbps total bitrate, 29fps, Audio Bit rate 189kbps. Version B. .wmv, 2.11Gb, 1080p, 5179kbps total bitrate, 29fps, Audio Bit rate 256kbps. Don't know if WMV3 was used. I can't be certain, but I think both versions were unDRMed from download versions. By that I mean that the DRM was stripped, rather than recording and reencoding the output of a DRM original. |
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6th January 2013, 10:06 | #4 |
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OK, I'd take Version B. although Version A. is also very good quality. I would take B over A because my monitor and my television are both 1080p. Most if not all computer video players use bicubic or bilinear scaling. The resizing of the 720p up to 1080p will cause the most degradation to the quality. If your monitor / television is 720p, take version A. The bitrates in both these are both so high that the resizing will be more of a factor than the bitrate. All that said, I can't guarantee I know what I'm talking about. This is just a guess from past experience.
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23rd January 2013, 05:52 | #5 |
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Removed at request of claimed rights holder.
Last edited by BigJake; 29th March 2013 at 11:46.
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23rd January 2013, 10:11 | #6 |
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As a professional videographer, the best way to describe birate or mbps (mega bit per second) is birate is to video as megapixel is to still photography. You can blow the picture up as big as you want, just like video from 480-1080, but if you still camera can only shoot 12 megapixel vs 22 megapixel, all you doing is blowing up a bunch of imperfection and noise. Broadcast approved television shows/news are a minimum of 50mbps, shows like CSI, Fringe, Person of Interest, etc... are shot at above 50mbps in 1080 and file sizes are extremely HUGE, of course codec plays an important role in compression rate. When you are talking about 480,720,1080, you are talking about resolution and NOT quality of the picture because most of the porn on the internet are compressed due to servers and bandwith, most "HD" porn are at or below 5mbps, that's why they are measured in KBPS as some don't even reach 1mb so it can't be referred to as mbps. There are so true HD videos out there and when you play them, the first thing you will hear is your CPU fan coming on because your graphic card is trying to trying to interpret the details in EACH FRAME as opposed to the details in the whole movie/content. The answer to your question is Video A will have a better quality, BUT since the kbps isn't that much different, you may not see the difference but if you look at Video A carefully, I bet you will see a cleaner image.
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23rd January 2013, 12:40 | #7 | |
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