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Old 28th August 2017, 15:11   #1  |  Link
TEB
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Join Date: Feb 2003
Location: Palmcoast of Norway
Posts: 363
CRF using to little bits..

hi. Im trying to do some test encodes for our streaming solution and i have some problems getting x264 to use enough bits in CRF mode..

Any comments?

ffmpeg -i source.mp4 -pix_fmt yuv420p -codec:v libx264 -x264opts rc-lookahead=50:keyint=100:min-keyint=50:crf=24 -profile high -level 4.1 -preset slow -maxrate 7M -bufsize 14M -force_key_frames "expr:eq(mod(n,50),0)" -c:a copy -y AiB_HQ_3.mp4

Goal, ca. 7mbps avg bitrate
2 sec gop
forced idr at each gop start, and i-frames on each scene change
ive tried crf20-26.. im getting 3-4mbps on avg...

Any comments?
Or should i use 2 pass ABR instead?
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