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avis [info]: 1280x544 @ 23.98 fps (239470 frames)
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Information about the input file (resolution, framerate, number of frames).
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x264 [info]: using cpu capabilities: MMX MMXEXT SSE SSE2 3DNow!
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Your processor is an Athlon 64 and it supports the aforementioned processor extensions used by x264.
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x264 [warning]: VBV maxrate specified, but no bufsize.
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You're specifying a maximum bitrate but no buffer size. If you're encoding for a specific hardware device, you should specify the appropriate buffer size along with the max rate.
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mp4 [info]: initial delay 834166 (scale 10000000)
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Some sort of delay value relating to the mp4 muxing.
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x264 [info]: slice I:2323 Avg QP:19.01 size: 78885a 0:00:00
x264 [info]: slice P:101512 Avg QP:21.38 size: 28261
x264 [info]: slice B:135635 Avg QP:22.36 size: 9179
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The number of each
frame type. Also the average quantizer value for each of the frame types. Lower QP generally means better quality at the cost of more bitrate.
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x264 [info]: mb I I16..4: 19.1% 75.0% 5.9%
x264 [info]: mb P I16..4: 6.8% 17.0% 1.1% P16..4: 36.9% 6.0% 7.8% 0.0% 0.0% skip:14.4%
x264 [info]: mb B I16..4: 0.3% 1.0% 0.2% B16..8: 26.6% 2.0% 4.4% direct: 4.5% skip:61.0%
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This shows you the various types of partitions used for each of the different block types. For example, 5.9% of the I-frame partitions are 4x4 blocks. This is controlled by the --partitions commandline.
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x264 [info]: 8x8 transform intra:68.8% inter:73.5%
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Since you used the -8x8dct commandline, this section documents how often the 8x8 transform was actually used.
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x264 [info]: direct mvs spatial:96.3% temporal:3.7%
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Since you used --direct auto, the default, this states how often either --direct spatial or --direct temporal were used as chosen by the encoder.
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x264 [info]: ref P 68.0% 17.8% 6.6% 4.6% 2.9%
x264 [info]: ref B 83.3% 10.7% 2.9% 1.9% 1.2%
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You used 5 reference frames in your encoding, and this shows how often they were used for P-frames and B-frames. This is good for seeing how useful each extra reference frame is.
The bitrate of the raw H.264 stream.
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encoded 239470 frames, 3.55 fps, 3441.84 kb/s
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The framerate that the video was encoded at (i.e. how fast x264 encoded the video) and the final bitrate including the MP4 muxing overhead.