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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(124.80000000000001, 28.000000000000004%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EXL%3C/text%3E%3C/svg%3E)
Since a few weeks we have closed captions 608 & 708 on our master manifest HLS (we use dynamic packaging).
We haven't made any changes on our side.
This lines are added:
#EXT-X-MEDIA:TYPE=CLOSED-CAPTIONS,GROUP-ID="cc",NAME="CEA708_CC",DEFAULT=YES,INSTREAM-ID="SERVICE1"
#EXT-X-MEDIA:TYPE=CLOSED-CAPTIONS,GROUP-ID="cc",NAME="CEA608_CC",INSTREAM-ID="CC1"
Did you make an update that adds these lines?
Media Services can detect if there is an embedded 608 or 708 stream in the source H264 elementary stream.
Is your source encoder embedding 608 or 708 into the source stream or not? If we detect it, we will output those lines into the HLS manifest.
Yes but since when do you detect it?
Seems recent as our media had 608/708 for 2 years, and we didn't have those lines for a few weeks
Looks like the code for this feature was completed in April of 2022, and reached production in May of 2022. It's possible you just noticed it.
I'll see if there is a missing release note on the feature and have that back dated to April 2022.
Thanks! I miss this : https://learn.microsoft.com/en-us/azure/media-services/latest/release-notes#may-2022
It's possible to disable this behavior, for example in the smil? @John Deutscher (MSFT)
Unfortunately no, you can't currently disable the feature. Only way would be to strip the 608/708 from the original source video stream.