#### Description:
I want to merge 2 (or more) dash manifests into 1, each in a different period.

I understand this can be done using a playlist `gpac -i playlist.m3u -o manifest.mpd:sigfrag` and `sigfrag` for manifest generation only.
```
##begin pl.m3u
#props=#Period=1
asset1/manifest.mpd
#props=#Period=2
asset2/manifest.mpd
##end playlist
```
#### Expected:
All AdaptationSets & all Representations are in the new manifest.

#### Actual:
Only 1 video and 1 audio AdaptationSet/Representation is taken from the original manifests.

#### Environment:
 - macOS Monterey 12.0.1 (Apple M1)
 - GPAC version 1.1.0-DEV-rev1491-g5bed60917-master and 1.0.1 (released in September 2020) from the Downloads page
How to merge 2 (or more) existing DASH manifests
This is a GitHub Issue
repo:gpac
owner:gpac
Title : How to merge 2 (or more) existing DASH manifests
Issue date:

--- start body ---
#### Description:
I want to merge 2 (or more) dash manifests into 1, each in a different period.

I understand this can be done using a playlist `gpac -i playlist.m3u -o manifest.mpd:sigfrag` and `sigfrag` for manifest generation only.
```
##begin pl.m3u
#props=#Period=1
asset1/manifest.mpd
#props=#Period=2
asset2/manifest.mpd
##end playlist
```
#### Expected:
All AdaptationSets & all Representations are in the new manifest.

#### Actual:
Only 1 video and 1 audio AdaptationSet/Representation is taken from the original manifests.

#### Environment:
 - macOS Monterey 12.0.1 (Apple M1)
 - GPAC version 1.1.0-DEV-rev1491-g5bed60917-master and 1.0.1 (released in September 2020) from the Downloads page
--- end body ---
