Bug 254417 – [GStreamer] Dash video freezes after swapping between manifest variants

• Status: RESOLVED
• Resolution: FIXED
• Component: WPE WebKit

Created attachment 465569 [details]
Shaka swapping video variants fail

On wpewebkit 2.28 (also seen on 2.22), video playing on latest Shaka player freezes while audio continues playing.
The issue is caused by changing between multiple video variants from the source manifest - which have different (increasing) bandwidths.

Source manifest: https://aaaaaaaaaaaaaaaaaaaaaackipjeaaaaaaaayaaaa.pop-iad-2.cf.dash.row.aiv-cdn.net/dm/2$_xhtKlkIw1Zs1P__FsEORQ39Gxw~/88db/bfd7/f899/478e-b7a9-a58bda78b775/f50d20d5-bdb5-4c9e-a4f6-c45e3c7d7e03_corrected.mpd?encoding=segmentBase&amznDtid=A2YACIV26UKFI2

I have attached a shaka demo html that manually switches between 3 video variants with selectVariantTrack() and the issue can be observed.
In the network tab you should see initial video_X.mp4 being used, then after some time it will move to use video_11.mp4 and then video_12.mp4. Shortly after change to video_12.mp4 the freezing video will be observed.
This demo does not fail on Chrome or Firefox.
Also the issue can be seen with the source url in Shaka player's own demo site: https://shaka-player-demo.appspot.com/demo/

[Michael Catanzaro]

(In reply to laurence.ejraee from comment #0)
> On wpewebkit 2.28 (also seen on 2.22),

Hi, this version is much too old to be reporting bugs upstream. Feel free to reopen if you can reproduce with 2.40.

[Przemyslaw Gorszkowski]

Hi,

You should rather report it here: https://github.com/WebPlatformForEmbedded/WPEWebKit/issues

Thanks I'll report there.