3 ms·

Can you really save much space by re-encoding an already encoded video in AV1? Wouldn’t the efficiency improvement be offset by the doubling up of compression a

• layer8 4y ago
  I just googled a bit to see how much space could be saved by converting Blu-ray AVC content (1080p non-HDR) to AV1 with subjectively same-ish quality, and from what I gathered one can expect to save 40-50% storage space on average (with a spread of maybe more like 20-80% depending on the video). So it’s substantial, but maybe not substantial enough to run and reencode all your movies, unless moving to a free codec is the important motivation.
  • zanny 4y ago
    That seems like a cq based encode. Try av1an in its target quality mode - I've gotten some movies to a tenth the Blu-ray size with 98 vmafs and with only smudged detail at pixel level scrutiny. The trick is if your encoder can adapt the quantizer based off a metric to compare the encode quality you can save a ton more space without visual degradation.
• windowsrookie 4y ago
  You wouldn't save much going from h.265 -> AV1 but h.264 -> AV1 should be a significant savings. AV1 is ~30% more efficient than h.265. And h.265 is ~40% more efficient than h.264. The lower the resolution of the video, the less savings you will get. I personally will wait until more devices support hardware AV1 decoding. I believe only Intel 12th gen, and Nvidia 3000 support AV1 currently. I don't plan on purchasing a new laptop or smartphone for 3-4 years, at that point I may start encoding in AV1.
  • tim-- 4y ago
    AMD 6000 series cards also support hardware decoding of AV1.
    • post-factum 4y ago
      Except those based on Navi 24 (6400/6500) IIRC.