Poor playback performance for AV1 videos encoded with Aviator

[kdwk]

1. Encode a video using Aviator
2. Try to play it back
3. Plays like a slideshow

The video is played with nvav1dec on an Nvidia RTX 4070.
Transferred from gianni-rosato/aviator#82

Linked are the following videos:

1. Source video
2. Video compressed into H.264 with Handbrake
3. Video transcoded into AV1/opus with Aviator
4. Screen recording showing playback performance of 1-3

https://kdwk.tplinkdns.com/s/8PaZeYpe9eBSETt

Attached is the following picture:

1. Screenshot showing Aviator options used to encode video 3

Debugging Information:

GLib 2.78.6
GTK 4.12.5
Adwaita 1.4.8
GStreamer 1.22.8

[Rafostar]

Transferred from gianni-rosato/aviator#82

According to discussion in issue you linked, you also reproduce the same problem in all other GStreamer based GTK apps. In such case, I advise you to open this issue in GStreamer repo instead as this does not appear to be a Clapper specific problem.