Hello.
Convert video to flv using ffmpeg.
Trying to pick the options closest to those that are used by Vkontakte(already partly purely sporting and educational process).
Now click through settings
ffmpeg.exe -i input.avi -threads 24 -vcodec libx264 -b 450k -bt 450k -ab 128k -ar 44100 -ac 2 -vol 256-skip_frame none-coder 0 -async 1 -flags +loop+mv4 -maxrate 10000-bufsize 10000-me_method tesa-nr 0-wpredp 0 -g 250-qcomp 0.60-qmin 10 -qmax 50 -bf 16-sc_threshold 40 -qdiff 4-keyint_min 25 -deblockalpha 0-deblockbeta 0-b_strategy 2-coder 1 -cmp chroma-me_range 24 -flags2 +wpred+dct8x8+mixed_refs+mbtree -trellis 0-partitions +parti8x8+parti4x4+partp8x8+partb8x8 -i_qfactor 1.41-psnr -y output.mp4
Mediainfo for my file displays the following results:
Encoding settings : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=tesa / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=24 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=24 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=16 / b_pyramid=0 / b_adapt=2 / b_bias=0 / direct=2 / weightb=1 / open_gop=0 / weightp=0 / keyint=250 / keyint_min=25 / of scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=cbr / mbtree=1 / bitrate=450 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=50 / qpstep=4 / vbv_maxrate=450 / vbv_bufsize=18 / ip_ratio=0.71 / aq=1:1.00 / nal_hrd=none
But when you start to compare the data of the video file obtained using the program mediainfo can not understand:
1. For audio gives bit rate Bit rate: 153 Kbps, but I clearly ordered-ab 128k
2. How to change the settings:
— cabac
— bframes
— ratetol
— ip_ratio (despite the fact that ffmpeg prescribed ip_ratio=0.71 in the file all the same it turns out
— i_qfactor 1.41)
Interested in how these parameters can affect the final quality/size of the file?
Thank you
