Den 25.12.2021 17:35, skrev Andrew Randrianasulu via Cin:
seems to miss level=3 setting
$ cat bin/ffmpeg/video/ffv1.avi
avi ffv1
$ cat bin/ffmpeg/video/ffv1.mkv
matroska ffv1
threads=8
context=1
slices=30
$ cat bin/ffmpeg/video/ffv1.mov
mov ffv1
#coder=0
context=1
g=1
level=3
threads=16
slices=16
slicecrc=1
#pass=2
$
not sure if we should modify our avi/mkv profikes or add new (may be
with _v3 name) ones?
Without own experience yet, I would ask if there any reason to not use
the latest and more feature rich FFV1 level=version 3? Backward
compitibility, typical can v. 3 uncompress v. 1 compressed archives?
I conclude that a couple of referense papers on the web say and use
level 3 in their profile/presets:
1) Video into Matroska/FFV1
https://avpres.net/FFmpeg/im_FFV1.html
We advise to use only the version 3 of FFV1 in production, because the
version 1 is deprecated, the version 2 has never really existed, and the
version 4 is currently under development.
Transcode a video file using the FFV1 codec into the Matroska container
for preservation purposes.
Solution
ffmpeg \
-i input_file \
-c:v ffv1 \
-level 3 \
-coder 1 \
-context 1 \
-g 1 \
-slices 24 \
-slicecrc 1 \
-c:a copy \
output_file.mkv
2) Presets for FFV1 and MKV: Choosing the right parameters for the job
(ffv1_params.pdf)
https://docs.google.com/viewer?url=https%3A%2F%2Fmediaarea.net%2FEvents%2F2019-12-05_NoTimeToWait4%2F03.%2520Peter%2520B.%2520-%2520Presets%2520for%2520FFV1%2520and%2520MKV%2C%2520Choosing%2520the%2520right%2520parameters%2520for%2520the%2520job%2Fffv1_params.pdf&pdf=true
Level = FFV1 version
page 9 (of 30)
0
1 (Default)
3 (Recommended)
FFmpeg recipe (PAL)
page 27 (of 30)
ffmpeg -i VIDEO_IN \
-c:v ffv1 -level 3 -coder 1 -context 0 -slices 24 -slicecrc 1 \
-color_primaries bt470bg \
-color_trc bt709 \
-colorspace bt470bg \
-color_range mpeg \
-map 0 \
-top 1 \
-c:a copy \
-g 1 -pix_fmt + \
VIDEO_OUT.mkv
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