1756914 - Backward seeking freezes the video

Status: RESOLVED DUPLICATE of bug 1757971

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

Description

[Outvi V]

Currently I experienced such a problem that backward seeking will freeze the video with the following characteristics:

• The video freezes, but the audio works as is.
• The video will freeze at a bit later than the backward seeking starting point.
• When the backward seeking target is the beginning of the video, the video will stop freezing and continue playing when the playback progress reach the freezing time point.

It is reproducible at least on multiple videos over multiple sites with an Arch Linux device. For example:

• https://www.youtube.com/watch?v=fRed0Xmc2Wg
• https://www.bilibili.com/video/av809353785

Comment 1

[Outvi V]

Mozregression gives:

Bug 1754070: Update libdav1d to b562b7f648e26e64fae892495527b5b275d53183 r=jbauman
https://hg.mozilla.org/integration/autoland/rev/65e07dc89d820de46bbdcdc769fa517a66803f10

(I was submitting the bug through "Create a bug that is regressed by this bug", but it seems that Bugzilla did not mark it for me.)

Comment 2

[gwarser]

I can confirm. Regression info is correct.

Comment 3

[Jim Blandy :jimb]

I can reproduce this too, if it helps. It makes watching videos on Nightly pretty annoying.

Comment 4

[Jim Blandy :jimb]

Specifically, I can reproduce in current nightly as well as 65e07dc8 (the regression point mentioned above) in Fedora 35 in the following video:

https://www.youtube.com/watch?v=h7apO7q16V0

If I seek to the middle and let it play for a few seconds, and then click on the timeline to an earlier point in the video, the audio seeks correctly, but the video freezes, sometimes until it catches up to the place that it was last playing.

Comment 5

[Jim Blandy :jimb]

Attachment: about:support output

Comment 6

[Jim Blandy :jimb]

It seems like this is being tracked in bug 1757971.

Comment 7

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1754070

Comment 8

[gwarser]

If you use dot on your keyboard to step frame by frame it seems to jump back and forth. For example for frames abcd1234 it jumps a1b2c3d4 (sort of).