On Sunday, December 26, 2021, Terje J. Hanssen via Cin < [email protected]> 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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