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13th October 2009, 12:09 | #1 | Link |
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What data rate for blu-rays to MP4 with ripbot264?
I've been using ripbot264 constant rate of 15000 2 Pass on blu-rays and orginal rez and i can see no differance in it from the orginal blu-rays.
It makes the file size half of what it was. I was wondering what you guys use? Im playing them on a 40" and 52" 1080p LCDs off my HTPC. |
13th October 2009, 12:12 | #2 | Link |
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Normal guys would use CRF@22. Period. Normal guys do not use 2-pass because you cannot predict how much data each movie requires. 2-pass use ONLY if you want exact size!!! Also I would use MKV instead of MP4! (MP4 does not support FLAC compression for instance)
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13th October 2009, 12:28 | #3 | Link | |
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Why CRF22? What data rate does that end up being or is it differant for every movie? I don't want to lose any quality of the blu-ray it defeats the whole purpose if you do. I used MP4 since most anything will play it by default. I tired MKV seen know differance, i think file size was alittle smaller in MP4. |
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13th October 2009, 12:36 | #4 | Link | ||
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Quote:
Quote:
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13th October 2009, 12:40 | #5 | Link |
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You will always lose quality when you reencode (with a lossy codec). The question is if the loss is noticable and CRF encoding is a good way to ensure the movie gets enough bitrate and you are not wasting space. Encode a couple of short samples and find a CRF that looks good to you. Personally I use 22 for 1080p, 21 for 720p and 20 for SD, but it comes down to personal preference. 22 is a good starting value. The resulting bitrate will be different for every movie depending on resolution, the complexity of the source material and the encoding options you use. CRF tries to provide an easy way to make encodes with constant quality (for fixed encoding options) without you having to worry about bitrate.
The container (MP4/MKV) doesn't make much difference other than slightly different overhead and what kind of tracks you can stick into it. MKV offers more choice for audio and subtitles, but MP4 has better compatibility with standalone players, mostly handhelds and consoles. I use the latter for that reason. edit: Also double posting is against the forum rules and you already got the same answer in your other thread. Last edited by nurbs; 13th October 2009 at 12:45. |
13th October 2009, 13:49 | #6 | Link | |
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Also you should treat CRF=22 as a starting point to find your own CRF. After all you must find the highest possible CRF value that still gives accaptble quality for your eyes! I personally tend to use CRF=20 now with MB-Tree enabled...
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14th October 2009, 00:21 | #8 | Link | |
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If you want to hit a certain level of quality without a size/bitrate restriction, then you should use Single-Pass CRF mode...
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14th October 2009, 00:27 | #9 | Link | |
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One clip was 18mbps used CRF 19 it came out at 15mbps that was fine and looked great. Another clip was 18mbps as well i used CRF 19 and it came out at 10mbps and did not look very good. I guess ripbot figured 10 was anough? How does it come to that conclusion? I would like to go know lower than 15mbps on every movie. |
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14th October 2009, 00:34 | #10 | Link | ||
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However if one movie looks good at a specific CRF value, all other movies (of similar nature) will give similar quality at that CRF value - given you also use identical settings. Any movie will use the bitrate it requires to get the desired quality. That's the "magic" of CRF (If you don't want quality-based encoding, as CRF mode does, you will have to use 2-Pass mode and set the desire target average bitrate) Quote:
All the rate control happens inside x264
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