A couple of examples that may or may not be similar to your context.

In order to develop that angle, a target audience must be discerned. There are countless numbers of publications; each with a clearly defined audience. Virtually every news item has its own media receptacle. While many public relations firms will pitch “the development of target audiences,” most simply gather large lists of virtually all media outlets that are at least marginally relevant to an organization’s business.
http://asternglance.com/2010/05/13/serving-the-reporters-age...

Further leveraging its core technology, PixFusion now presents the only patented platform that offers advertisers and marketers the ability to deliver personalized video such as movie trailers and music videos to desktops, cell phones and other rich media receptacles as promotional and marketing toolsets.
http://www.tmcnet.com/usubmit/2005/jul/1166149.htm

Also, another example in German which seems to use the term in the same way:
Die Journalisten sind Produzenten von Inhalten, die rund um die Uhr in die verschiedenen medialen Gefäße abgefüllt werden...
http://www.eurotopics.net/de/dienste/autorenindex/autor_seif...
The site offers an English version:
Journalists produce content that is distributed into different media containers around the clock...
... which clearly won't do, but perhaps "outlets", or "channels" as suggested by Jennifer?
A French version is also offered:
Les journalistes sont désormais des producteurs de contenus qu'ils injectent 24 heures sur 24 dans les différents supports...