Renpy 8.0.2 VP9 framerate issues

[lsf22]

Renpy version: 8.0.2.22081402

VP9 encoded webm animations are not playing correctly in Renpy. It is not the webm vp9 encoded animations fault as it has been tested with another program and it plays fine. A same animation but encoded with VP8 works correctly. Why does VP9 a more recent and supposed improvement not work correctly with Renpy?

[PyTom]

Do you have a small game that demonstrates the problem?

[lsf22]

The game is not small. I noticed because I have made 2 versions of the same animation. One was made with VP8 encoding and the other with a VP9 encoding. The VP8 encoded version plays seemingly plays fine unlike the VP9 version which has a very noticeable frame rate lag.

[ReAnimator]

Maybe you can try to reduce the file size with VP9. It seems that is the only big difference.

[PyTom]

I mean, I'd like you to produce a game that has only the files in question, to make sure it's not some other portion of the game that's causing the problem. Assuming it's video playback that's doing it,

[Imperf3kt]

The vp9 file appears to use a far higher quantizizer, resulting in much higher bit rate and thus higher quality footage, but also severely more demanding on system resources.
Try reducing the quality of the file, or the bit rate, or increase the compression, both spacial and temporal, depending on what settings you used when encoding the file.

[lsf22]

I mean, I'd like you to produce a game that has only the files in question, to make sure it's not some other portion of the game that's causing the problem. Assuming it's video playback that's doing it,

I have created a short Renpy game build of it with some animations. Hopefully I don't need to create much longer animations because they are taxing on my system. The drop in frame rates for VP9 might be more noticeable in some faster and longer animations. Also apologies for the awkward animations. Most of the animations from the software I use are mostly meant for hentai stuff.

The links are provided with MediaFire as the host to these test game builds.

Windows/Linux:
https://www.mediafire.com/file/9ibhl5pv ... c.zip/file

Mac:
https://www.mediafire.com/file/fjysuy4w ... c.zip/file


The files of the game are open so you can inspect the video animations yourself and of course the code.

[ReAnimator]

Mmm, I don't see the difference. Both versions play well on my computer.
Though I think FPS should be 24 or 30 at most as it's just video?

[Imperf3kt]

Taking a look your video files, the vp8 file is encoded with 0.045 bits of data per pixel resulting in a bitrate data stream of 9 976 kb/s

Whereas you vp9 encoded file is using a whopping 0.273 bits per pixel resulting in a bitrate of 62.8 Mb/s


Thats a 506.6% increase in system resource use, which on my computer, caused no lag or other issues, but my PC is fairly high spec.

I suggest compressing the file further.

[lsf22]

I made 2 more webm animations to test out and it's looks like it's something to do with VP9 playback. The VP8 animation is appears to play smoother and loop smoother than the VP9 animation with a lower bitrate.

I attached 2 images of the media info.
1 is a VP8 with a quality setting of 0 (Lower number = higher quality, from when it was encoded)
The other is a VP9 with a quality setting of 35 (Lower number = higher quality, from when it was encoded)

[Imperf3kt]

Very odd then.
As I noted before, the game worked fine for me, no lagging or odd behaviour even with the larger file.

[lsf22]

Very odd then.
As I noted before, the game worked fine for me, no lagging or odd behavior even with the larger file.

I have more animations you can test out with it so you can see the difference in how it plays. There are 4 animations, that are paired up with each other. x

"vp8_q0_a1" and "vp9_q0_a1" are one pair. The quality is on 0 (lower is higher, with 0 being highest quality).
"vp8_q35_a2" and "vp9_q35_a2" are another pair of animations that can be tested. (Quality of 35 for these pairs)

Since there is faster movement in the animations it helps being able to see the difference.

Link to animations for testing: https://www.mediafire.com/file/n5di04vr ... 1.zip/file