3 ms·

> it's about not eating through all of your battery before you're done watching the video we're talking about hours of playtime before you run out of power, yo

by iopq 3y ago

> it's about not eating through all of your battery before you're done watching the video we're talking about hours of playtime before you run out of power, you can verify this on your own phone on youtube right now, go enable av1 and marvel at how YOUR phone can play these videos at 1080p > Overall AV1 real-time playback of 720p 30fps @ 2Mbps is feasible for low-end devices with 4 threads and 1080p 30fps @ 4Mbps is feasible for high-end and mid-range devices with 4 threads using Dav1d decoder Why only 4 threads? My phone from 2020 has 8 cores/8 threads and a 720p screen https://www.gsmarena.com/oppo_a32-10454.php https://www.gsmarena.com/oppo_a32-10454.php So even if it doesn't handle some 1080p videos that I haven't tested, I should probably be watching them at 720p since that's all my phone can do.

Sesse__ 3y ago
> Why only 4 threads? My phone from 2020 has 8 cores/8 threads and a 720p screen Of which half of them are small cores (Cortex-A53), which is pretty likely to throw a spanner in the works of the threading model. But hey, feel free to inform the dav1d authors that their dav1d paper benchmarked dav1d wrong.
- iopq 3y ago
  I didn't say they did it wrong, I asked a question. It wasn't a rhetorical question. Anyway, this point might be moot because dav1d has released several versions with further NEON optimizations after the paper https://code.videolan.org/videolan/dav1d/-/tags/1.1.0 https://code.videolan.org/videolan/dav1d/-/tags/1.1.0 https://code.videolan.org/videolan/dav1d/-/releases/1.2.1 https://code.videolan.org/videolan/dav1d/-/releases/1.2.1 https://code.videolan.org/videolan/dav1d/-/releases/1.3.0 https://code.videolan.org/videolan/dav1d/-/releases/1.3.0
  - Sesse__ 3y ago
    Yes, and there's _still_ not 1080p everywhere! There was a talk on Demuxed 2023 _yesterday_, where the last sentence in the abstract is: “720p real-time AV1 software playback on the large majority of Android devices out in the wild is now a reality.”
    - iopq 3y ago
      Maybe some difficult 1080p videos, but my phone can handle 30 FPS ones from what I've tested. It depends of course if you require NO dropped frames, or simply not noticeable performance degradation. I can't tell when it drops one frame out of a thousand

by iopq 3y ago

Sesse__ 3y ago

> Why only 4 threads? My phone from 2020 has 8 cores/8 threads and a 720p screen Of which half of them are small cores (Cortex-A53), which is pretty likely to throw a spanner in the works of the threading model. But hey, feel free to inform the dav1d authors that their dav1d paper benchmarked dav1d wrong.

iopq 3y ago
I didn't say they did it wrong, I asked a question. It wasn't a rhetorical question. Anyway, this point might be moot because dav1d has released several versions with further NEON optimizations after the paper https://code.videolan.org/videolan/dav1d/-/tags/1.1.0 https://code.videolan.org/videolan/dav1d/-/tags/1.1.0 https://code.videolan.org/videolan/dav1d/-/releases/1.2.1 https://code.videolan.org/videolan/dav1d/-/releases/1.2.1 https://code.videolan.org/videolan/dav1d/-/releases/1.3.0 https://code.videolan.org/videolan/dav1d/-/releases/1.3.0
- Sesse__ 3y ago
  Yes, and there's _still_ not 1080p everywhere! There was a talk on Demuxed 2023 _yesterday_, where the last sentence in the abstract is: “720p real-time AV1 software playback on the large majority of Android devices out in the wild is now a reality.”
  - iopq 3y ago
    Maybe some difficult 1080p videos, but my phone can handle 30 FPS ones from what I've tested. It depends of course if you require NO dropped frames, or simply not noticeable performance degradation. I can't tell when it drops one frame out of a thousand