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15th September 2008, 17:40 | #1 | Link |
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HCEnc overcompensating on bitrate?
I've had this issue on several encodes. HCEnc keeps saying "adjusting average bitrate," at a percentage that gets higher and higher as the encode goes on. On my latest, by the end it reported bitrate adjustments of 55%! The input AVS takes a 720p file, IVTC's and resizes to 720x480. Are these adjustments because I specify a max GOP of 14 with no B frames? Does anyone else do that?
I figured you'd want the log file so here's the whole whopping thing: Code:
| HCenc - MPEG2 encoder - rel. 0.22.0.0 | MPEG profile@level: MP@ML input: c:\tv\fringe dvd\fringe.avs output: C:\TV\Fringe DVD\fringeDVD.m2v -------------------- | encoder settings | -------------------- profile: BEST frames: 0 136750 framerate: 23.976 aspect ratio: 16:9 bitrate Kb/s: 6600 max. bitrate Kb/s: 6600 pulldown: no closed gops: no VBV check: yes scene change det.: yes interlaced: no, BFF goplen,B-pic: 14 0 dc_precision: 10 scan method: zigzag bias: 0 chapter frames: 9 time code: 0 0 0 0 CPU: SSE3 priority: idle SMP active: yes matrix: MPEG luminance gain: no ------------------ | source stats | ------------------ nr. of frames in source: 136751 width*height: 720x480 fps: 23.976 nr. of frames to encode: 136751 frames to encode: 0 - 136750 --------------------- | encoding - pass 1 | --------------------- pass 1 encoding time: 1:27:59 (5278.80 s) fps: 25.9 -------------------------------- | encoding - intermediate pass | -------------------------------- bitrate set to: 6589 kb/s est. outfile length: 4587895 kB intermediate encoding time: 42.3 s --------------------- | encoding - pass 2 | --------------------- *** INFO, adjusting average bitrate: -0.36 % *** INFO, adjusting average bitrate: -0.74 % *** INFO, adjusting average bitrate: -0.89 % *** INFO, adjusting average bitrate: -1.09 % *** INFO, adjusting average bitrate: -1.70 % *** INFO, adjusting average bitrate: -2.18 % *** INFO, adjusting average bitrate: -2.52 % *** INFO, adjusting average bitrate: -3.09 % *** INFO, adjusting average bitrate: -3.50 % *** INFO, adjusting average bitrate: -3.91 % *** INFO, adjusting average bitrate: -4.39 % *** INFO, adjusting average bitrate: -4.94 % *** INFO, adjusting average bitrate: -5.41 % *** INFO, adjusting average bitrate: -5.73 % *** INFO, adjusting average bitrate: -6.22 % *** INFO, adjusting average bitrate: -6.49 % *** INFO, adjusting average bitrate: -6.91 % *** INFO, adjusting average bitrate: -7.49 % *** INFO, adjusting average bitrate: -8.06 % *** INFO, adjusting average bitrate: -8.63 % *** INFO, adjusting average bitrate: -9.24 % *** INFO, adjusting average bitrate: -9.87 % *** INFO, adjusting average bitrate: -10.67 % *** INFO, adjusting average bitrate: -11.28 % *** INFO, adjusting average bitrate: -11.80 % *** INFO, adjusting average bitrate: -12.47 % *** INFO, adjusting average bitrate: -13.16 % *** INFO, adjusting average bitrate: -13.74 % *** INFO, adjusting average bitrate: -14.30 % *** INFO, adjusting average bitrate: -14.64 % *** INFO, adjusting average bitrate: -14.80 % *** INFO, adjusting average bitrate: -15.41 % *** INFO, adjusting average bitrate: -16.10 % *** INFO, adjusting average bitrate: -16.68 % *** INFO, adjusting average bitrate: -17.29 % *** INFO, adjusting average bitrate: -18.01 % *** INFO, adjusting average bitrate: -18.49 % *** INFO, adjusting average bitrate: -18.68 % *** INFO, adjusting average bitrate: -19.23 % *** INFO, adjusting average bitrate: -19.91 % *** INFO, adjusting average bitrate: -20.78 % *** INFO, adjusting average bitrate: -21.58 % *** INFO, adjusting average bitrate: -22.51 % *** INFO, adjusting average bitrate: -23.38 % *** INFO, adjusting average bitrate: -24.05 % *** INFO, adjusting average bitrate: -24.96 % *** INFO, adjusting average bitrate: -25.62 % *** INFO, adjusting average bitrate: -26.37 % *** INFO, adjusting average bitrate: -26.80 % *** INFO, adjusting average bitrate: -27.16 % *** INFO, adjusting average bitrate: -27.75 % *** INFO, adjusting average bitrate: -28.46 % *** INFO, adjusting average bitrate: -28.98 % *** INFO, adjusting average bitrate: -29.61 % *** INFO, adjusting average bitrate: -30.48 % *** INFO, adjusting average bitrate: -30.97 % *** INFO, adjusting average bitrate: -31.39 % *** INFO, adjusting average bitrate: -32.14 % *** INFO, adjusting average bitrate: -33.10 % *** INFO, adjusting average bitrate: -34.01 % *** INFO, adjusting average bitrate: -34.60 % *** INFO, adjusting average bitrate: -35.05 % *** INFO, adjusting average bitrate: -35.67 % *** INFO, adjusting average bitrate: -36.67 % *** INFO, adjusting average bitrate: -37.11 % *** INFO, adjusting average bitrate: -37.88 % *** INFO, adjusting average bitrate: -38.79 % *** INFO, adjusting average bitrate: -39.51 % *** INFO, adjusting average bitrate: -40.65 % *** INFO, adjusting average bitrate: -41.72 % *** INFO, adjusting average bitrate: -42.45 % *** INFO, adjusting average bitrate: -43.21 % *** INFO, adjusting average bitrate: -44.31 % *** INFO, adjusting average bitrate: -45.23 % *** INFO, adjusting average bitrate: -46.16 % *** INFO, adjusting average bitrate: -46.82 % *** INFO, adjusting average bitrate: -47.22 % *** INFO, adjusting average bitrate: -47.93 % *** INFO, adjusting average bitrate: -48.58 % *** INFO, adjusting average bitrate: -49.62 % *** INFO, adjusting average bitrate: -50.83 % *** INFO, adjusting average bitrate: -51.75 % *** INFO, adjusting average bitrate: -53.19 % *** INFO, adjusting average bitrate: -54.37 % *** INFO, adjusting average bitrate: -55.01 % pass 2 encoding time: 2:13:39 (8019.12 s) fps: 17.1 ------------------ | encoding stats | ------------------ intra matrix used 8 16 19 22 26 27 29 34 16 16 22 24 27 29 34 37 19 22 26 27 29 34 34 38 22 22 26 27 29 34 37 40 22 26 27 29 32 35 40 48 26 27 29 32 35 40 48 58 26 27 29 34 38 46 56 69 27 29 35 38 46 56 69 83 non-intra matrix used 16 17 18 19 20 21 22 23 17 18 19 20 21 22 23 24 18 19 20 21 22 23 24 25 19 20 21 22 23 24 26 27 20 21 22 23 25 26 27 28 21 22 23 24 26 27 28 30 22 23 24 26 27 28 30 31 23 24 25 27 28 30 31 33 nr. of gops: 10823 nr. of frames: 136751 nr. of I-frames: 10823 nr. of P-frames: 125928 nr. of B-frames: 0 average bitrate: 4234 minimum bitrate: 123 maximum bitrate: 6599 bytes in bitstream: 3019697148 bits in bitstream: 24157577184 average Quantizer: 3.351 total CPU time: 5:44:02 (20641.75 s) total elapsed time: 3:42:21 (13341.08 s)
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16th September 2008, 05:33 | #3 | Link |
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What 45tripp is trying to say in a very shorthand manner is to increase your max bitrate. 8500 should give the encoder room to move on high BR scenes.
Also, read this post and the one following. Regards
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Les Only use genuine Verbatim or Taiyo Yuden media. Last edited by blutach; 16th September 2008 at 05:38. |
16th September 2008, 19:43 | #4 | Link |
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When I set the max bitrate to 8000, it caused a buffer underflow according to Muxman. I've had spikes up near 11000 at a max bitrate of 8000! The audio is 448k BTW.
In this particular video, bitrate viewer reports a peak of 7308 and an average of 3967. I suppose I'll have to settle for b-frames if the encoder can't handle it.
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16th September 2008, 23:43 | #5 | Link |
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A buffer underflow reported by Muxman means a VBV issue.
Reading your log it shows you're using HC022, this version sometimes had VBV problems, this was fixed in HC023, please update... With 448k audio, a maxbitrate of 8500 should be OK. Is there a specific reason you don't want to use B-frames?
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17th September 2008, 21:55 | #7 | Link |
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Excellent - it's great to see the VBV issue addressed in the new version.
Regarding b-frames, when I first began the quest to learn more about compression, I associated them with low bitrate video. The way I saw it, I could go with a low bitrate and use b-frames to salvage a little quality, or skip b-frames all together and use a higher bitrate for higher quality. B-frames are sort of a yoyo between reference frames that could be 2 or more frames apart, whereas p-frames just work from the frame immediately before, right? But perhaps b-frames are nothing to fear - and judging by my bitrate issue it's not working to do without them. You sure know more about this than I do, Hank.
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