most recent 30 from video.stackexchange.com 2025-08-05T11:26:36Z https://video.stackexchange.com/feeds/question/37761 https://creativecommons.org/licenses/by-sa/4.0/rdf https://video.stackexchange.com/q/37761 0 EllipticalInitial https://video.stackexchange.com/users/25617 2025-08-05T14:39:54Z 2025-08-05T16:34:56Z

<p>I produce 3D animations and I keep an archive of the final rendered animation (lossless 16 bpc RGB tif sequences) in case I need to re-upload it somewhere else in the future. It is much faster to just transcode the archival file again than re-rendering it.</p> <p>However, I have a lot of them, and I need to keep the file sizes down while maximizing quality.</p> <p>Of all the codecs I tested, VVC (libvvenc) and HEVC (libx265) seem the most promising. In terms of the encoding parameters, I narrowed it down between these:</p> <p>VVC:</p> <p><code>ffmpeg -i &quot;16bpc_rgb_input_%04d.tif&quot; -y -c:v libvvenc -preset slow -tier high -qpa 0 -period 1 -vvenc-params bitrate=700M out.266</code></p> <p>HEVC:</p> <p><code>ffmpeg -i &quot;16bpc_rgb_input_%04d.tif&quot; -y -c:v libx265 -preset slower -crf 9 -pix_fmt yuv444p12le out.mp4</code></p> <p>Both of these produce files that are a very similar file size and are about the size I'd like to keep them at.</p> <p>My intuition would tell me the HEVC should be better quality because of the pixel format used; <code>yuv444p12le</code> should preserve much more information than the <code>yuv420p10le</code> used in VVC (this is the only pixel format it supports right now), yet despite this, some of the metrics tell a different story:</p> <p><a href="https://i.sstatic.net/XNC9GRcg.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/XNC9GRcg.png" alt="enter image description here" /></a></p> <p>(The PSNR metric in this table is a straight average over all frames, and the final average is an average over all input videos. The PSNR was computed using the 16bpc RGB .tif sequence as the reference.)</p> <p>Basically, the PSNR metric was generally still substantially lower for HEVC than VVC across an average of 6 input videos I tested, despite the fact that the source was 16bpc and HEVC was using a better pixel format (12 bit versus 10, and 444 versus 420).</p> <p>I can get a slightly better PSNR if I use <code>-crf 1</code> with HEVC rather than <code>-crf 9</code>; the issue is that this explodes the file size way beyond what is acceptable.</p> <p>I realize that one metric (PSNR) isn't everything, and I can't visually see a difference when extracting frames from both and comparing side by size. Ultimately, though, I still have to make a decision, and <strong>I don't have a sense for what's more important to prioritize; is it the pixel format or should it be the PSNR? Why?</strong> I'm just wanting a general understanding.</p>

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