Direct download in mapped-mode with multi-sequence playlists

[benweidig]

Hi,
we're using the module in mapped mode for HLS streaming, and it's great.
But we also need to support legacy clients with direct MP4 delivery.

Our setup:

• another location with "vod none;"
• Requesting playlist with "http://.../direct/playlist.json"

If the playlist contains only one sequence it works, but we have multiple sequences...
How can we select the correct sequence of the playlist? We tried to give the sequences the property id, but how do we supply it with the URL?

Is it even possible to download a single playlist sequence from a multi-sequence playlist?

We're getting "ngx_http_vod_map_media_set_apply: unsupported - non-trivial mapping in progressive download", which is understandable, the module just don't know how to select the correct sequence.

If not possible we think about generating additional single-sequence-playlists for direct delivery.

Thx!

[erankor]

There are URL parameters for selecting a sequence (by index - -f1, or by id -s<id>), but unfortunately, it won't work for progressive download, since the file name part of the URL isn't parsed in this case.
In HLS, for example, you could pass index-f1.m3u8 to get the index playlist of the first sequence.
In progressive, the file name can be whatever you want, so nginx-vod-module doesn't parse it.
The only way to do it is to return a JSON with a single sequence.
In our setup, other than complex cases (e.g. playlist) we always return a single MP4 in the JSON, and we combine several of these JSON using urlset to achieve adaptive streaming.

[benweidig]

Thx for the explanation.

Too bad the URL parameters aren't supported in progressive downloads.

We''ll give the "many many playlists" route a try, that looks easier in our case compared to URL-sets.