Dash.js: RepSwitchList.mt metric reports incorrect time

[davemevans]

When adding a new representation switch metric, the value used for the mt attribute is video.currenttime, but this is incorrect as it returns the media time now, rather than of the first access unit at the new quality.

The spec calls for "the media presentation time of the earliest access unit (out of all media content components) played out from the “to” Representation."

I've been staring at this for ages and I've tried a number of hacks but have so far not managed to get this time reliably. Has anyone solved this problem already, or have any ideas on how?

[dsparacio]

@bbcrddave I assume this is still the case but wanted to check if this was resolved?

[davemevans]

No change unfortunately. :confused:

[davemevans]

This would probably be unblocked by #1365.

[davemevans]

This should be a quick fix once Dan's FastSwitchABR has been merged.

[dsparacio]

Fast switch is merged with PR #1434

[davemevans]

My preferred solution to this is blocked on #1439. Of course, there may be other solutions ...

[dsparacio]

My preferred solution to this is blocked on #1439.

@bbcrddave Meaning a fix for this issue is blocked until #1439 is resolved?

[davemevans]

I think so, yes - you need to know both the start and end of each transition and that's not currently possible 100% of the time (though it's arguably a corner case reported in #1439).

I think it's low priority as I doubt anyone is using this metric anyway. Be nice to get it right at some point though.

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