<div dir="ltr"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="gmail_default" style="font-size:small">for now it seems only ffv1.avi defaults to v.0 and mkv defaults to 3.4 <br></div></blockquote><div class="gmail_default" style="font-size:small">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.<br></div><div class="gmail_default" style="font-size:small"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Dec 25, 2021 at 9:29 PM Andrew Randrianasulu via Cin <<a href="mailto:cin@lists.cinelerra-gg.org">cin@lists.cinelerra-gg.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br><br>On Sunday, December 26, 2021, Terje J. Hanssen via Cin <<a href="mailto:cin@lists.cinelerra-gg.org" target="_blank">cin@lists.cinelerra-gg.org</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>
Den 25.12.2021 17:35, skrev Andrew Randrianasulu via Cin:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
seems to miss level=3 setting<br>
<br>
$ cat bin/ffmpeg/video/ffv1.avi<br>
avi ffv1<br>
$ cat bin/ffmpeg/video/ffv1.mkv<br>
matroska ffv1<br>
threads=8<br>
context=1<br>
slices=30<br>
$ cat bin/ffmpeg/video/ffv1.mov<br>
mov ffv1<br>
#coder=0<br>
context=1<br>
g=1<br>
level=3<br>
threads=16<br>
slices=16<br>
slicecrc=1<br>
#pass=2<br>
$<br>
<br>
not sure if we should modify our avi/mkv profikes or add new (may be with _v3 name) ones?<br>
<br>
</blockquote>
<br>
Without own experience yet, I would ask if there any reason to not use the latest and more feature rich FFV1 level=version 3? Backward compitibility, typical can v. 3 uncompress v. 1 compressed archives?</blockquote><div> </div><div>good question... I have older avplay (~2012) here and will test. </div><div><br></div><div>for now it seems only ffv1.avi defaults to v.0 and mkv defaults to 3.4 due to crc protection per slice, i think (looked into ffmpeg encoder source) </div><div><br></div><div>{filenames were just that I had in inputbox, not indicative of content} </div><div><br></div><div><br></div><div>$ mediainfo ~/h265-p2.avi</div><div>General</div><div>Complete name : /data/data/com.termux/files/home/h265-p2.avi</div><div>Format : AVI</div><div>Format/Info : Audio Video Interleave</div><div>File size : 8.82 MiB</div><div>Duration : 3 s 720 ms</div><div>Overall bit rate mode : Variable</div><div>Overall bit rate : 19.9 Mb/s</div><div>Writing application : Lavf58.76.100</div><div><br></div><div>Video</div><div>ID : 0</div><div>Format : FFV1</div><div>Format version : Version 0</div><div>Codec ID : FFV1</div><div>Duration : 3 s 720 ms</div><div>Bit rate mode : Variable</div><div>Bit rate : 19.9 Mb/s</div><div>Width : 720 pixels</div><div>Height : 576 pixels</div><div>Display aspect ratio : 5:4</div><div>Frame rate : 25.000 FPS</div><div>Standard : PAL</div><div>Color space : YUV</div><div>Chroma subsampling : 4:2:0</div><div>Bit depth : 8 bits</div><div>Compression mode : Lossless</div><div>Bits/(Pixel*Frame) : 1.916</div><div>Stream size : 8.81 MiB (100%)</div><div>coder_type : Golomb Rice</div><div><br></div><div><br></div><div>$ mediainfo ~/h265-p2.mkv</div><div>General</div><div>Unique ID : 3614689160526176147752985704114819283 (0x2B829EF6988D4EEDCB446A8612210D3)</div><div>Complete name : /data/data/com.termux/files/home/h265-p2.mkv</div><div>Format : Matroska</div><div>Format version : Version 4</div><div>File size : 7.48 MiB</div><div>Duration : 3 s 80 ms</div><div>Overall bit rate mode : Variable</div><div>Overall bit rate : 20.4 Mb/s</div><div>Writing application : Lavf58.76.100</div><div>Writing library : Lavf58.76.100</div><div>ErrorDetectionType : Per level 1</div><div><br></div><div>Video</div><div>ID : 1</div><div>Format : FFV1</div><div>Format version : Version 3.4</div><div>Codec ID : V_MS/VFW/FOURCC / FFV1</div><div>Duration : 3 s 80 ms</div><div>Bit rate mode : Variable</div><div>Bit rate : 20.0 Mb/s</div><div>Width : 720 pixels</div><div>Height : 576 pixels</div><div>Display aspect ratio : 5:4</div><div>Frame rate mode : Constant</div><div>Frame rate : 25.000 FPS</div><div>Standard : PAL</div><div>Color space : YUV</div><div>Chroma subsampling : 4:2:0</div><div>Bit depth : 8 bits</div><div>Scan type : Progressive</div><div>Compression mode : Lossless</div><div>Bits/(Pixel*Frame) : 1.927</div><div>Stream size : 7.34 MiB (98%)</div><div>Default : Yes</div><div>Forced : No</div><div>Color range : Full</div><div>Matrix coefficients : BT.470 System B/G</div><div>coder_type : Golomb Rice</div><div>MaxSlicesCount : 30</div><div>ErrorDetectionType : Per slice</div><div><br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
I conclude that a couple of referense papers on the web say and use level 3 in their profile/presets:<br>
<br>
1) Video into Matroska/FFV1<br>
<a href="https://avpres.net/FFmpeg/im_FFV1.html" target="_blank">https://avpres.net/FFmpeg/im_FFV1.html</a><br>
<br>
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.<br>
<br>
<br>
Transcode a video file using the FFV1 codec into the Matroska container for preservation purposes.<br>
Solution<br>
<br>
ffmpeg \<br>
-i input_file \<br>
-c:v ffv1 \<br>
-level 3 \<br>
-coder 1 \<br>
-context 1 \<br>
-g 1 \<br>
-slices 24 \<br>
-slicecrc 1 \<br>
-c:a copy \<br>
output_file.mkv<br>
<br>
2) Presets for FFV1 and MKV: Choosing the right parameters for the job (ffv1_params.pdf)<br>
<a href="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" target="_blank">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</a><br>
<br>
Level = FFV1 version<br>
page 9 (of 30)<br>
<br>
0<br>
1 (Default)<br>
3 (Recommended)<br>
<br>
<br>
FFmpeg recipe (PAL)<br>
page 27 (of 30)<br>
<br>
ffmpeg -i VIDEO_IN \<br>
-c:v ffv1 -level 3 -coder 1 -context 0 -slices 24 -slicecrc 1 \<br>
-color_primaries bt470bg \<br>
-color_trc bt709 \<br>
-colorspace bt470bg \<br>
-color_range mpeg \<br>
-map 0 \<br>
-top 1 \<br>
-c:a copy \<br>
-g 1 -pix_fmt + \<br>
VIDEO_OUT.mkv<br>
<br>
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</blockquote>
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</blockquote></div>