Azure Media Services clip live archive

Question

I have a live stream on Azure Media Service that I want to create a dynamic filter on to only show a small section of that stream. Imagine that we have a stream going on for 24 hours and but the content that current user cares about is only 1 minute long. So we want to create a dynamic filter on this stream that only shows this specific minute.

When I read this document https://learn.microsoft.com/en-us/azure/media-services/previous/media-services-dynamic-manifest-overview#creating-subclips-views-from-a-live-archive

It says: "With Dynamic Manifest, you can create filters using start/end times and create virtual views over the top of your live archive.".

However, when I check another page for the filters https://learn.microsoft.com/en-us/rest/api/media/operations/presentationtimerange

It says: "EndTimestamp: Applies to VoD. For the Live presentation, it is silently ignored and applied when the presentation ends and the stream becomes VoD."

Is it not possible to use dynamic filters (presentationeTimeRange) to create a small video clip for a live stream? Do the live stream needs to end before it's possible?

What am I missing?

Answer 1

Here is what you can do to get manifest containing specific 1 minute of presentation,

1. A LiveEvent has been going on for, say, 48 hours
2. The LiveOutput has a 24 hour DVR window
3. So if current time is 10AM Tuesday, the DVR window contains video+audio data in the range (10:00:01 AM Monday - 10:00AM Tuesday)
4. There is a segment of interest that is one minute in duration, say 6:00PM – 6:01 PM on Monday a. Content is still in the DVR window
5. You want to create a dynamic filter to return just the (6:00PM Monday – 6:01PM Monday) portion a. If so, then set StartTimestamp and Endtimestamp to correct timestamp on video timeline along with flag forceEnd=true

Note: Assuming live ingest keeps going, this filtered manifest request will return,

a. Empty manifest, if requested before 6:00PM Monday

b. Live manifest, if requested between 6:00PM Monday – 6:01PM Monday

c. VOD manifest, if requested after 6:01PM Monday till all the fragments in that 1 minute are still in DVRWindow

d. http Error, if any one of the fragments present in the filtered manifest (6:00PM – 6:01PM on Monday) goes out of DVR window.

Answer 2

It was possible with V3 of the api. I had previously only used V2.