When doing my design project review, we talked to someone from a company that makes all sorts of hardware for digital broadcast (for compression, adding logos, multiplexing, etc...) He said that broadcast video starts off with some sort of queue signal that tell the downstream companies where to place adds. I guess there was some abuse of this data, so everyone removes the queues before they get to the consumer. We asked if there was anything similar in the vertical blank, but he said no. Here is a fun commercial removing project if anyone wants to start it. You could setup a system to record a show from two different locations (east / west coast or something). The result will be two video files with the same content but different commercials. Then all you need to do is identify what parts differ and remove them. Kinda like diff but for video. --Tom ----- Original Message ----- From: "Alan Cox" <alan@xxxxxxxxxx> To: <video4linux-list@xxxxxxxxxx> Sent: Tuesday, April 03, 2001 2:59 PM Subject: Re: Automatically cutting commercials > > I saw once a live show with a normal broadcast TV and a satelite TV. > > While in the ads, the normal TV show then. > > But the TV through satelite shows a blank screen , maybe because the ads are > > localized and not shown to all country. > > Correct. > > > So ,this is a evidence that they broadcast some info in vertical retrace to > > keep the regional repeaters in sync with the ads. > > In the UK the analogue channels use a small rectangle of black/white diagonal > stripe to key the advertising drop in, and now days use teletext. The digital > channels appear to use something buried in the digital data streams > > PDC can also indicate adverts but the standard is deliberately misimplemented > by TV companies so it cannot be used to filter adverts > > > > _______________________________________________ > Video4linux-list mailing list > Video4linux-list@xxxxxxxxxx > https://listman.redhat.com/mailman/listinfo/video4linux-list >
