HDTV: Difference between revisions
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High-Definition Television. Means Broadcasts with higher resolutions than [[PAL]] or [[NTSC]]. |
High-Definition Television. Means Broadcasts with higher resolutions than [[PAL]] or [[NTSC]]. For standards and backgrounds, see the Wikipedia article [http://en.wikipedia.org/wiki/HDTV]. |
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== Getting some HDTV with Linux == |
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== A note on "HDTV ready" computer-hardware == |
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Nowadays, many DVB-cards (whether USB or PCI, whether DVB-T or DVB-C) are advertised with "HD-ready" or "HDTV" (for example, the newest [[TwinhanDTV Digital Terrestrial TV Card Ter|Twinhan DVB-T card]]. But then, what does this really mean? An MPEG2 [[TS]] in principle can always have high-definition contents, the TS container doesn't bother. It might mean, the card won't freak out if a TS/PS is not MPEG2, but MPEG4 (as this encoder is often used for HDTV). If might also mean, the card can handle high bandwidth TS (e.g. about 15 Mbit/s for HD-BBC in the DVB-T testrun in London, as opposed to 4 Mbit/s for the regular SDTV). But this is all not well defined, and therefore, this "HDTV ready" sticker might be more of a PR-thing... |
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However, '''in no case''' does it mean, the hardware has a hardware-decoder for HDTV-resolutions ([[full-featured cards]]). Such PCI-cards don't exist yet (end of 2006). (This makes it difficult to use them with the software [[VDR]], as that one mostly relies on hardware-decoding.) |
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This note is complicated by the fact that many broadcaster will not send HDTV free to air, but either encrypt it (making additional hardware necessary: [[CI]], [[CAM]], which is not always possible for a given DVB-card) or turn a No-Copy-Flag on, which (at least currently) means it can't be handled by Linux. |
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''' ''more details?'' ''' |
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[[Category:Technology]] |
[[Category:Technology]] |
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Revision as of 15:56, 25 December 2006
High-Definition Television. Means Broadcasts with higher resolutions than PAL or NTSC. For standards and backgrounds, see the Wikipedia article [1].
Getting some HDTV with Linux
A note on "HDTV ready" computer-hardware
Nowadays, many DVB-cards (whether USB or PCI, whether DVB-T or DVB-C) are advertised with "HD-ready" or "HDTV" (for example, the newest Twinhan DVB-T card. But then, what does this really mean? An MPEG2 TS in principle can always have high-definition contents, the TS container doesn't bother. It might mean, the card won't freak out if a TS/PS is not MPEG2, but MPEG4 (as this encoder is often used for HDTV). If might also mean, the card can handle high bandwidth TS (e.g. about 15 Mbit/s for HD-BBC in the DVB-T testrun in London, as opposed to 4 Mbit/s for the regular SDTV). But this is all not well defined, and therefore, this "HDTV ready" sticker might be more of a PR-thing...
However, in no case does it mean, the hardware has a hardware-decoder for HDTV-resolutions (full-featured cards). Such PCI-cards don't exist yet (end of 2006). (This makes it difficult to use them with the software VDR, as that one mostly relies on hardware-decoding.)
This note is complicated by the fact that many broadcaster will not send HDTV free to air, but either encrypt it (making additional hardware necessary: CI, CAM, which is not always possible for a given DVB-card) or turn a No-Copy-Flag on, which (at least currently) means it can't be handled by Linux.