1536449 - 8k videos are not played properly

Status: NEW

(Core :: Audio/Video: Playback, defect, P3)

Description

[Rares Doghi, Desktop QA]

Attachment: 2019-03-19_16h35_19.mp4

[Affected versions]:
Nightly 68.0a1

[Affected platforms]:
Platforms: all

Steps :

1. Launch the Firefox Browser and reach https://www.youtube.com/watch?v=ChOhcHD8fBA
2. Set the video resolution to 8k(4320p).

Expected Results :

The Videos should load and play properly with 8k resolution.
This issue was tested on Windows 10 with Nvidia Gt730 and 16GB of RAM

Actual Results :

As soon as the user sets the 8k resolution the video will keep freezing.

Comment 1

[Adam Stevenson [:adamopenweb]]

I noticed the video is choppy in Firefox and Chrome but not seeing the same level of freezing as your screen recording.

Testing on MBP 2017, i7 with Radeon Pro 560 4096 MB.

Comment 2

[Jean-Yves Avenard [:jya]]

What CPU do you have? Your graphic card doesn't support vp9 decoding. It's very unlikely this machine would be fast enough to do 8k vp9. How are other browsers behaving?

Comment 3

[Jean-Yves Avenard [:jya]]

Also note, you are manually setting 8k,does YouTube select this resolution automatically if you don't force it?

It is unreasonable to expect a machine could do 8k in software unless a very recent machine.

Comment 4

[Rares Doghi, Desktop QA]

It's an AMD Fx(tm)-8320 Eight-Core Processor 3.5Ghz - 16GB Ram

ON Chrome even though its interrupting it still shows the video running.
ON Firefox the video will only show something when You click somewhere on the seek bar after which only the sound continues.
ON Edge the 8k option is not even displayed, it just shows 1080p.

Youtube selects 4k automatically which works fine.

Comment 5

[Michael Froman [:mjf]]

Jean-Yves, are you looking into this further, or should someone else take it?

Comment 6

[Jean-Yves Avenard [:jya]]

Nothing we can do for now. Bug 1539735 would likely resolve this issue, or at least makes it better.

Comment 7

[Liviu Seplecan]

Reproducible on the latest Nighlty 69.0a1 on Windows 7x64

Comment 9

[Asif Youssuff]

Two new profiles from: https://www.reddit.com/r/firefox/comments/gtczou/any_updates_on_video_decoding_performance/

Linux: https://share.firefox.dev/3eyVMdh

Windows 10: https://share.firefox.dev/3diKn19

So I started the profiler, then navigated to the video url, then I had to wait a few seconds to skip a video ad, then the video started playing on 8K for a few seconds, then I skipped to a different part of the video and let it play for a few seconds again before stopping the capture.

Jean-Yves is there anything interesting in these new profiles?

Comment 10

[Jean-Yves Avenard [:jya]]

This only shows me your system is too slow to play that video.

I won't expect a 8K videos, particularly a VP9 one to perform well with no HW decoding.

Chrome and Firefox have different strategies when it comes to playing videos when the system is too slow to do so.

Chrome will constantly pause both the audio and video; they won't drop frames much.

Firefox on the other hand, plays the audio without interruption; it will drop frames but comes a time where it's no longer sufficient and it will skip from keyframe to the next.

this is what you are seeing.

I would mark this bug as won't fix or works for me.

Comment 11

[Asif Youssuff]

Jean-Yves, the user says that these are their specs on their PC:

Ryzen 3700X 8 core/16 thread 4.4 GHz
32 GB DDR4 3733 MHz Cl16 ram
Radeon 5700XT 8 GB
Samsung 970 Evo 500GB NVMe SSD
Windows 10 1909 (latest public build)

and that the playback works fine in Edge for them.