On Sunday, December 26, 2021, Phyllis Smith via Cin <cin@lists.cinelerra-gg.org> wrote:
for now it seems only ffv1.avi defaults to v.0 and mkv defaults to 3.4
For now, how about if I just add a comment to ffv1.mkv about level numbers?   That way the user will see this if they look and can decide for themselves.  Otherwise if we make every possible setting available we will end up with millions of choices and then if we have new ones labeled _3, when level 4 comes along we would need even more as _4.

ok, add comment please} 



On Sat, Dec 25, 2021 at 9:29 PM Andrew Randrianasulu via Cin <cin@lists.cinelerra-gg.org> wrote:


On Sunday, December 26, 2021, Terje J. Hanssen via Cin <cin@lists.cinelerra-gg.org> wrote:


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?
 
good question... I have older avplay (~2012)  here and will test. 

for now it seems only ffv1.avi defaults to v.0 and mkv defaults to 3.4 due to crc protection per slice, i think (looked into ffmpeg encoder source) 

{filenames were just that I had in inputbox, not indicative of content} 


$ mediainfo ~/h265-p2.avi
General
Complete name : /data/data/com.termux/files/home/h265-p2.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 8.82 MiB
Duration : 3 s 720 ms
Overall bit rate mode : Variable
Overall bit rate : 19.9 Mb/s
Writing application : Lavf58.76.100

Video
ID : 0
Format : FFV1
Format version : Version 0
Codec ID : FFV1
Duration : 3 s 720 ms
Bit rate mode : Variable
Bit rate : 19.9 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Compression mode : Lossless
Bits/(Pixel*Frame) : 1.916
Stream size : 8.81 MiB (100%)
coder_type : Golomb Rice


$ mediainfo ~/h265-p2.mkv
General
Unique ID : 3614689160526176147752985704114819283 (0x2B829EF6988D4EEDCB446A8612210D3)
Complete name : /data/data/com.termux/files/home/h265-p2.mkv
Format : Matroska
Format version : Version 4
File size : 7.48 MiB
Duration : 3 s 80 ms
Overall bit rate mode : Variable
Overall bit rate : 20.4 Mb/s
Writing application : Lavf58.76.100
Writing library : Lavf58.76.100
ErrorDetectionType : Per level 1

Video
ID : 1
Format : FFV1
Format version : Version 3.4
Codec ID : V_MS/VFW/FOURCC / FFV1
Duration : 3 s 80 ms
Bit rate mode : Variable
Bit rate : 20.0 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate mode : Constant
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossless
Bits/(Pixel*Frame) : 1.927
Stream size : 7.34 MiB (98%)
Default : Yes
Forced : No
Color range : Full
Matrix coefficients : BT.470 System B/G
coder_type : Golomb Rice
MaxSlicesCount : 30
ErrorDetectionType : Per slice



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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