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13th May 2011, 09:16 | #182 | Link |
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No, beacause :
- My encodes are running most of the time while i'm not at home, and, i prefer to have optimal result, that target bitrate is exactly the same during 1st and 2nd pass. - I've noticed, in practical use, "huge" differences between final bitrate of 1st and 2nd pass, most of the time bitrate of 1st pass is lower, wich make size of 1st pass unrealiable to adjust accordingly, when you want to fit at around 10MB for BR25 and 20MB for BD50. |
13th May 2011, 10:19 | #183 | Link | |||
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Quote:
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But worrying about a 0.1 % undershoot is pretty insane anyway, IMO. |
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13th May 2011, 13:21 | #184 | Link |
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Not at home, means : If i'm not home during 8h, and encoding take : 1h for 1st pass and 6h for 2nd pass, it will not change anything to stop after 1h or do the encode totaly, in both case, it will finish before my return.
But i'm insane, and using insane setting for encoding also. |
13th May 2011, 17:31 | #185 | Link |
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Ok, getting a dual-layer dvd movie that only uses 5gb is pretty crap. But seriously, .05%.
Encode something at 10000kbit/s, then the same material at 9950kbit/s. See is you can spot the difference. And that is .5%. 10x greater than what you are shooting for.
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13th May 2011, 21:57 | #186 | Link |
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Well, I'm more curious to know what sort of PC he has that he can encode a full movie at "insane" settings two passes in 8 hours. My i7-2600k at 4.2gHz with a full x64 flow takes about 12 hours for 2 passes at very slow.
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14th May 2011, 03:20 | #187 | Link | |
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Also, I don't encode 2 pass. But it is my understanding that there isn't a 6:1 ratio between passes either.
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14th May 2011, 04:32 | #188 | Link | |
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I guess we'll have to wait to see the command line he's using... |
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16th May 2011, 08:47 | #190 | Link |
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I have an i7@980.
Don't have here my commande line, but i use placebo, and ajust a little the 1rst pass. Take me several tries to be sure to have the exact same numbers of I,B and P frame between passes and the overall parameters having globaly the same value. Speed ratio is around 4 between passes, and take around 24h for a 2h 1080p video, and 8h for a 720p video. You can find my 1080p commande line here. For 480p upscaled to 720p, it's the same but with level 4.0, 6 ref frames, 48 keyint, no slices and bitrate/buffer max at 15000. All my workflow is also x64 (lossless codec x64 (UT Video) + Avisynth x64 + x264 x64). Last edited by jpsdr; 16th May 2011 at 08:59. |
17th June 2011, 08:04 | #195 | Link |
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As i've said, i've put a rough estimation in post #156 here.
The few datas i've got give me the feeling that it may be impossible to have an very accurate estimation, because final size may be related too much to actual data. But it's only a guess. Last edited by jpsdr; 17th June 2011 at 08:06. |
18th July 2011, 05:50 | #197 | Link |
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In general? With what content (steam types) ?
at the moment I roughly approximate the tsMuxeR Overhead by int(lengthInSeconds + 1) * 20.9 * 192 (byte) there might be a similar way to approximate the overhead Scenarist uses. |
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