Hi Folks,
I'm implementing a Playback engine , and i'm required to implement :
interface VideoPlaybackQuality {
readonly attribute DOMHighResTimeStamp creationTime;
readonly attribute unsigned long droppedVideoFrames;
readonly attribute unsigned long totalVideoFrames;
The Documentation mentions :
The droppedVideoFrames attribute MUST return the total number of frames
dropped predecode or dropped because the frame missed its display deadline.
My Concern and clarification is that :
- When starting playback and while repositioning we Syncronize Audio /
Video . During this time the audio / Vide playlists are not syncronized (
The Audio is generally ahead of Video ) and starting Video frames have to
be dropped to sync it with Audio track.
Should these dropped frames be accounted in render/ dropped statistics?
Secondly, While doing Trick playback , should dropped / rendered frames be
added to the Stats?
As an example consider this use case:
1. Playback Starts
2. The IDR frame of the Video playlist is at Presentation timestamp , say
"35.23"
3. The Audio Playlist is at presenation timestamp : "37.56"
4. Video frames from 35.23 to 37.56 will need to be dropped to syncronize
with audio track.
Question: Should these frames be accounted in playback statistics? As this
is just initial AV Syncronization , and is not reflective of playback
quality. I would expect frames dropped after playback starts to be
reflective of playback quality.
Regards
Nimesh
--
You received this message because you are subscribed to the Google Groups
"[email protected]" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/a/mozilla.org/d/msgid/dev-platform/315f3df5-b096-4c26-91e8-b111b66dfbcen%40mozilla.org.
