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OTA Transport Stream Capture

post #1 of 4
Thread Starter 
Anyone know of any tuner/capture cards that allow you to record over-the-air transport streams directly to disk?

The majority of the cards I see decode then re-encode to MPEG2. I'd like to bypass the extra loss and record the .ts directly.
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post #2 of 4
Correct me if I'm wrong, but I don't recall there being a need for decoding and re-encoding of OTA signals. ATSC recievers "Basically" decompress and then tune a frequency out of the mpegTS for the specific channel that is being requested. Then that audio/video for that channel can be recorded to the HDD. If you wanted to record a TS directly you would then need something to pull it appart to play the content of all the different channels it carries. But maybe that's your goal, I don't know. Then again maybe Canada doesn't transport multiple channels on one TS. Still I don't believe you need to worry about quality loss other than the lossy compression used when the TS is decompressed by the reciever.

There is a PVR app that uses (or at least tried to use-I've never tried it) an ATSC tuner to capture a TS and allow you to record multiple channels off that TS at once. It's called GBPVR (or NPVR is its new temporary name). I don't know much about it other than I read somewhere it can do it. Probably not exactly what you were looking for, but I thought I'd mention it.
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post #3 of 4
Media portal records as ts.
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post #4 of 4
Thread Starter 
Quote:
Originally Posted by craigap;12504546 
Correct me if I'm wrong, but I don't recall there being a need for decoding and re-encoding of OTA signals. ATSC recievers "Basically" decompress and then tune a frequency out of the mpegTS for the specific channel that is being requested. Then that audio/video for that channel can be recorded to the HDD. If you wanted to record a TS directly you would then need something to pull it appart to play the content of all the different channels it carries. But maybe that's your goal, I don't know. Then again maybe Canada doesn't transport multiple channels on one TS. Still I don't believe you need to worry about quality loss other than the lossy compression used when the TS is decompressed by the reciever.

There is a PVR app that uses (or at least tried to use-I've never tried it) an ATSC tuner to capture a TS and allow you to record multiple channels off that TS at once. It's called GBPVR (or NPVR is its new temporary name). I don't know much about it other than I read somewhere it can do it. Probably not exactly what you were looking for, but I thought I'd mention it.
Quote:
Originally Posted by hick;12506290 
Media portal records as ts.

That's more or less how it works. The TS isn't actually compressed, it's a packetized stream where multiple elementary streams are muxed and distinguished by a packet ID. FYI, Canada does broadcast multiple elementary streams in a single transport stream.

Turns out my inquiry was more about the tuners. I was under the impression they funneled all incoming data through the hardware-based encoders, hence my concern and desire to go up to the TS level.

From the looks of things, they only send the analog signals through the encoders. The ATSC programs can be captured directly as you guys pointed out with GBPVR and MediaPortal. Time to start capturing!
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