Unexpected VTT drift -> subtitle overlayed and audio/video mismatch may even reach a few seconds

Support
1

Dear all

The VTT has been checked on-prem with the original source and is sync, but when overlay-ed by bitmovin rendering the trans-coded proxy, there’s a drift. Have you heard of a similar issue before?

Thanks in advance.

Hugo

PS: note → at the beginning of the file, the VTT texts and audio/video frames seem to be aligned. But, progressively, they are less and less synch’ed, due to that discrete-but-increasing drift (that may even reach about 6 seconds at the end)

2

Hi Hugo,
Thanks for reaching out to us.
Please could you specify :

  • impacted platforms
  • player version / does it work with the latest player version
  • does reloading the stream solves the issue ?
  • if the issue happens after eg. 120s of playback, does seeking right away to 120s and hit play reproduces the issue ?
  • Test stream

Thanks in advance for your feedback. We’ll investigate accordingly

3

Hi Ludovic

sincere apologies, it was our fault.
Something wrong on our side.
Thank you anyway
Kind Regards

Hugo

4

Thanks for your feedback. I’ll close the case then. Please feel free to reach out to us again if needed