Hello,
I use ffmpeg 8.0, lib x265 to compress videos.
The coomand :
#!/bin/sh
for f in *.ts; do ffmpeg -y -i "$f" -vcodec libx265 -crf 19 -preset slow
-vf yadif,nlmeans="1.4:7:5:3:3" -c:a copy "$(basename "$f" .ts).mkv";done
It is an interlaced video, therefore yadif, nlmeans to reduce filesize.
But the result is all ways not as expected. I did check it with vivictpp
(subective tool to compare two videos (same source) at a screen and
libvmaf to get the respective score :
Different crf values used, but without an significant improvement.
source file target file vmaf crf vivictpp (checked source against target
size (MB) size (MB) at one screen)
251,6 121,6 VMAF score: 93.913822 19 visible less unsharp
251,6 135,2 VMAF score: 94.189536 18 visible less unsharp
251,6 150,6 VMAF score: 94.433205 17 visible less unsharp
251,6 167,7 VMAF score: 94.648169 16 visible less unsharp
251,6 208,6 VMAF score: 95.011963 14 visible less unsharp
251,6 259,6 VMAF score: 95.011963 12 visible less unsharp
the movie
source :
Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr,
90k tbn, start 0.044000
Side data:
cpb: bitrate max/min/avg: 15000000/0/0 buffer size: 1835008
vbv_delay: N/A
target :
Stream #0:0: Video: hevc (Main), yuv420p(tv, progressive), 720x576 [SAR
64:45 DAR 16:9], 25 fps, 25 tbr, 1k tbn
Metadata:
ENCODER : Lavc62.11.100 libx265
Any idea how to improve the results ?
Richard
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