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17th November 2013, 20:50 | #181 | Link | ||
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18th November 2013, 19:25 | #182 | Link | |
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videofan3d, this is my second time and I noticed VBR algorithm undersize files as much as 40 % and I am using pacific rim as a example. While I expected file size to be 18GB+, it was around 10 GB or so for both stream. I have provided command line and specify bitrate in Kbit/s
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I decided redo and change bitrate to 28000, after about 55% done (calculate from number of frames done, from total frames) total size is 7.10 GB for both stream.
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If you fail to plan; you plan to fail, would you not agree? Think about it. Last edited by HWK; 18th November 2013 at 19:31. |
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18th November 2013, 19:34 | #183 | Link | |
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Can I have your calcul for Bitrate ? |
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18th November 2013, 20:05 | #184 | Link | |||
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Spoke to soon, error is still there, but I think I have manged to get bottom of this and that is encoder help fine need some work, instead kilobits unit it expect bit-rate to be in Kilobytes. When I enter 60000 KBps (kilobytes per second) media info report correctly about max bitrate for combine avc and mvc to be 60 MBps (megabytes per second) which can be confirmed by reading values from original and another mvc encoder. Quote:
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If you fail to plan; you plan to fail, would you not agree? Think about it. Last edited by HWK; 18th November 2013 at 20:45. |
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18th November 2013, 20:43 | #186 | Link | |
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Still resize is an issue for me, I am still trying to figure out why.
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If you fail to plan; you plan to fail, would you not agree? Think about it. Last edited by HWK; 18th November 2013 at 20:47. |
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18th November 2013, 21:11 | #189 | Link | |
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After all it's doing in VBR so may be that is expected from encoder
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If you fail to plan; you plan to fail, would you not agree? Think about it. Last edited by HWK; 18th November 2013 at 21:13. |
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18th November 2013, 22:30 | #190 | Link | |
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Also you do know you can go up to 60000 max rate combined, I use all the time and encoder is smart enough to split bitrate correctly. For example base view bitrate never go above 40Mbps, peaks not included.
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If you fail to plan; you plan to fail, would you not agree? Think about it. Last edited by HWK; 18th November 2013 at 22:37. |
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19th November 2013, 02:16 | #192 | Link |
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It failed for me as well, I also tried with avisynth with 2.6.0 Alpha 5. I just use pipe and for me it works very well.
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If you fail to plan; you plan to fail, would you not agree? Think about it. Last edited by HWK; 19th November 2013 at 02:56. |
19th November 2013, 03:25 | #193 | Link | |
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I encoded with bitrate 30298Kbps, with max at 60000Kbps. However bitrate scanner tell different story altogether. Source: Pacific Rim Currently, I am re-doing the test with average bitrate and max bitrate at same value and it is set to 60000Kbps. It would be interested to see what happens with output.
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If you fail to plan; you plan to fail, would you not agree? Think about it. Last edited by HWK; 19th November 2013 at 03:28. |
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19th November 2013, 06:47 | #195 | Link |
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Thanks, for the result. Good to know I am not the only one. My guess VBR need some work and in my case difference is huge though.
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If you fail to plan; you plan to fail, would you not agree? Think about it. |
19th November 2013, 14:08 | #196 | Link |
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Bitrate
Regarding bitrate:
parameters for -vbr and -cbr are passed to Intel Media libmfxsw32.dll library, which controls the whole encoding. Intel documentation specifies that it is in Kbit/s, defined as unsigned 16-bit number, where 1 kbit means 1000 bits. Regarding "underbitrating" for VBR: I can imagine why it happens. Intel Media is single pass encoder. When you specify -vbr 16000 24000, it means that maximum bitrate is 24000 Kbit/s which can be easily controlled. But average 16000 Kbits/s is a bit complicated issue for encoder, because single pass encoder cannot predict complexity of the videoscene, it can only evaluate current frame or maybe current GOP. So to achieve overall VBR on given value 16000 Kbits/s is only best guess for it. Therefore encoder uses rather lower bitrate whenever possible in order to prevent potential excess in future more complex scenes. As result it may happen that overall average bitrate is lower than specified. Last edited by videofan3d; 19th November 2013 at 14:27. |
19th November 2013, 18:01 | #197 | Link | |
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[update1] I just finished encoding on 60000 bitrate and so far my findings are file size is half of projected. For example I expected to be around 56GB, but final turn out to be around 27 GB. Solution for me double the bitrate for example if I want 1000, write 2000 in encoder file and my final output would be of 1000 Kbps. In the meantime I would also try few more disc as well and see if it is some kind of pattern which I can repeat.
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If you fail to plan; you plan to fail, would you not agree? Think about it. Last edited by HWK; 19th November 2013 at 22:59. |
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20th November 2013, 00:54 | #199 | Link |
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Input resolution -sbs or -tab
@videofan3d
In your documentation for the Encoder (which is very helpful and clear, thanks!) you write: Please note, side‐by‐side Full HD 3D avi‐input has to have size 3840(!)x1080, however output MVC‐encoded elementary streams will have standard size 1920x1080. I just like to comment that input resolution of 2560x720 (-sbs 2) or 1280x1440 (tab 2) are accepted as well. MVC encoded elementary streams will then be 1280x720. |
20th November 2013, 01:03 | #200 | Link |
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Yes, it does. If it is open gop it will increase compression efficiency and less bitrate is need to achieve same quality.
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If you fail to plan; you plan to fail, would you not agree? Think about it. |
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