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  1. Member
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    Anyone? I lost a lot of my blurays rips because I didn't have a backup. Going to rerip but to mkv this time in order to keep the size as minimal as possible while still maintaining most of the video fidelity

    Recommendations?
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  2. Mod Neophyte Super Moderator redwudz's Avatar
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    I do all my RipBot BD backups to MKV with two pass, 1920 X 1080, AC3 6 channel, target size about 8GB to fit on a DVD DL disc for backup if I have hard drive storage failure. I have a video projector and large screen for playback. No complaints about quality. Takes about 4 hours with my setup.
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  3. Yeah 10 GB is plenty.

    On a related note, the more experience I gain, the more I'm inclined to think that many Blu-Ray transfers look just as good when re-encoded at 720P. Like one Doom9 regular says in regard to high-definition, pixel count isn't everything.

    Maybe the source wasn't so great. Maybe a lot of filtering was applied. I think the "Predator" Blu-Ray is a prime example of this. I won't venture to estimate what proportion of Blu-Ray releases fall into this category, but it's not insignificant.
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  4. @AnyD
    Don't aim for size. Use Constant Quality Mode (CQ) instead of 2-pass. Remember lower value means higher quality and bigger bitrate/size. 18 should give you excellent quality.
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    Atak - the file size can be pretty big though?

    Fritzi / Redwudz - would you change the file size accordingly depending on the movie size? What I mean is Goodfellas is a 20gb m2ts file but Godfather 1 is 49gb - still use the same size?
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  6. Atak - the file size can be pretty big though?
    Fritzi / Redwudz - would you change the file size accordingly depending on the movie size? What I mean is Goodfellas is a 20gb m2ts file but Godfather 1 is 49gb - still use the same size?

    In Constant Quality mode encoder decides automatically how much bitrate is required in order to reach specific quality level. With CRF@18 you should get sizes below 10 GB. Sometimes it can be ~5 GB and sometimes ~10GB. Remember movies with wider aspect ratio (letterboxed) and less dynamic will require less data than full 16:9 frame with lot of action. 2-pass should be ONLY used if you put your movies on CD,DVD,BD. Also Constant Quality mode does not need second pass. You save a lot of time!
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    I'm not putting it on dvds. It will be streamed from a server. I just want to convert to something that will not be as big as a straight rip of the blu-ray but at the same time maintain as much video / audio quality as possible.

    How good will CRF@18 be?
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  8. Mod Neophyte Super Moderator redwudz's Avatar
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    I mostly size for backup to DVD DL media. I've lost server drives and hours of encoding, so the ~8GB size works for me for server backups.

    If you just need the video for quick access on a server, then CQ would be a lot faster encode. (And the quality level you pick should be consistent with all your videos, even the longer ones, though they may be larger sized.)
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    Ok thanks. If I get another failure again where I lose two of my drives then I will no longer continue backing up my blurays. I rather have the best quality than a 2nd backup as I spent a bit getting a WHS set up.

    Ok I'll keep the CQ consistent. I'll try out CQ18 to see how it fares vs source material

    EDIT - you mentioned AC3 6 channel - is that 5.1? Also what do you normally go for kbps?
    Last edited by AndyD; 8th Aug 2010 at 21:52.
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  10. Mod Neophyte Super Moderator redwudz's Avatar
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    640Kb/s AC3, usually 5.1 (6 channel) as that's all my surround sound is set up for.
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    I just got around to trying this out - got a 3gb file for Bourne Identity using CRF 22 - seems pretty low no? For 1080p?
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    Originally Posted by AndyD View Post
    I just got around to trying this out - got a 3gb file for Bourne Identity using CRF 22 - seems pretty low no? For 1080p?
    I obviously have a tough time with reading comprehension - I went the opposite direction with the CRF thinking higher was better. Doh. Rerunning now for 18
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  13. 18-19 is pretty transparent to the actual source.
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  14. Member edDV's Avatar
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    Originally Posted by patmann03 View Post
    18-19 is pretty transparent to the actual source.
    But the stock Blu-Ray disc has already been compressed 15-30 times. They stopped there because it was "good enough". You should see a comparison to the original.
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    How long should these conversions last? The eta usually starts at around 4 hours but it ends up taking 8. Seems a bit long and I think I have pretty decent hardware
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  16. Mod Neophyte Super Moderator redwudz's Avatar
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    With RipBot, it takes me about six hours to convert a BD main movie to a two pass MKV 8Gb file. That with a overclocked 3.6Ghz six core CPU. It does take some time. But the quality is excellent.
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    K. I'm not sure what is slowing it down. It starts with high fps but then slows down to half of that. For Godfather, it's going to take 15 hours

    I don't have a 6 core cpu - I have the Intel quad core but I would think it's decent enough. Oh well. I guess this will be a much longer project than I originally anticipated



    EDIT - I see now why Godfather may be taking that much more time. It's actually quite larger than some of the other movies that I've been converting
    Last edited by AndyD; 26th Aug 2010 at 08:58.
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  18. Mod Neophyte Super Moderator redwudz's Avatar
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    If you were using the two pass option in RipBot, the first pass is much faster than the second pass, IE, more frames per second.

    With a stock Intel Q9550, it took me about 8 hours for the average BD>MKV conversion. A longer movie would add more time to that. I rip the BD to my hard drive and convert from that, so I don't factor in the ripping time. Converting directly from the BD disc may take a bit longer.

    You can check 'Task Manager>Performance' and see if you are getting 90%+ utilization with all cores of your CPU. If so, that's about as fast as it can run.
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    Yeah, it's going the fastest it can. It took 17 hours to finish. CRF settings means just one pass though right? Or is it 2?

    Godfather ended up at 25gbs. Seems a bit big. For now I'll leave as is - I think I need to do a lot more conversions to get a sense of what to expect etc
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  20. Mod Neophyte Super Moderator redwudz's Avatar
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    CRF is one pass. 25GB does seem a bit on the large side as the main movie on the BD probably isn't much larger.
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    The ones I'm converting now are around 20-30gbs but the Godfather trilogy seems to be 46gb for each movie
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