What filtering are you referring to? I mean, the code is the same, there must be some randomized calculations inside those functions which sometimes do a better job and sometimes worse, but in average they do a good job.
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If some randomized algorithms are in the background, it usually happens that the output is not the same. If there are no randomized calculations inside these functions, then it can be only different versions of filters (more likely) or different settings (I doubt this is the case). Anyway, it can be confirmed by trying the same encoding process two/more times under the same installation and checking the file size.
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Randomized ? I don't think so. When using CRF the size you get is highly depended on the source. How much detail, how much noise, etc,etc.
For example, using a soft resizer such as bilinear will give a smaller file than a resizer that accentuates detail and sharpness such as lanczos -
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Some filters use random dither/noise patterns. But the nature of the variations make the difference in compression very small from run to run.
Also, x264 isn't deterministic by default. There will be small differences each time you encode. The number of threads used makes a difference too. But those differences are very small until you get up to several dozen of threads.Last edited by jagabo; 24th May 2019 at 23:10.
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@Santuzzu
You seem to compare jagabo's 41MB file from post #12 which includes the audio with your encoded file which is video only, right? -
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You need to compare the entire "encoding settings" string. You can mark the text then copy/paste into Notepad.
The version of x264.exe I used is older than yours. That may be the source of the difference.Last edited by jagabo; 25th May 2019 at 18:26.
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Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=50 / keyint_min=5 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=22.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=30000 / vbv_bufsize=30000 / crf_max=0.0 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
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Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=500 / keyint_min=50 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=22.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 -
I had keyint set to 50 and keyin_min set to 5. That would make my file bigger.
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