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MediaPortal 1
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Watch / Listen Media
Television (MyTV frontend and TV-Server)
PMT Pid wasn't found on the PAT.
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<blockquote data-quote="mm1352000" data-source="post: 1136011" data-attributes="member: 82144"><p>It is only an indication. The actual values reported and their "accuracy" depend entirely on the tuner driver.</p><p></p><p>About the value range: there is no guarantee that the range is 0..100 (ie. a percentage). Many drivers - I think including DD - do report that way, but some definitely do not.</p><p></p><p>About "accuracy": the values are likely to be averages, and as such they probably won't show very short glitches. Also, they'll often be "quantised" (...which means the driver may only report 0, 10, 30, 50, 80, 100, and no in-between values).</p><p></p><p>So in short: don't rely on the readings too much.</p><p></p><p></p><p>I think you're right. The suggested tests should confirm.</p><p></p><p>Note that the signal division is almost certainly equal between tuners 1 and 2, and 3 and 4. However, depending on the implementation, the splitters may be bypassed when only 1 tuner on the card is in use. Also note that cross-tuner interference can be an issue for such splitter + multi tuner designs. That's why I suggested to test each tuner on each card individually, and then also together. Testing properly is important... but quite complex to do correctly. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p></p><p>Due to the laws of physics, it's impossible to not lose signal strength when you introduce a splitter. Splitting signal is just like splitting a water hose. The pressure at the end of each split is a proportion of the incoming pressure, and depends on which splits are in use.</p><p></p><p></p><p>In the tests you may find that tuner 2 works okay when the second card is disconnected... and that may mean that your incoming signal strength/quality is sufficient for 2 tuners... but not 4.</p><p>...and yes, you <em>can </em>fix such an issue with hardware: an amplifier. In my water hose analogy, if you want to get the same water pressure at each output after a split then you need to increase the pressure at/before the input to the splitter with a valve or pump. An amplifier is the equivalent of a valve/pump for signal.</p><p></p><p></p><p>The TV service, TsWriter and TsReader show various PID details if you're interested, but it's a bit complicated. TV channels have at least 2 PIDs - one for video and one for the main audio. Each additional audio language/stream is [usually] an additional PID. DVB subtitles and teletext is another 2 PIDs.</p><p></p><p>My understanding is that CAM limits may be defined by a channel count, or a PID count, or a bit-rate. If your CAM can do 14 PIDs then it may be able to decrypt up to 7 TV channels [each with 1 video stream and 1 audio stream]... or 4 TV channels [each with 1 video stream and 2 audio streams].</p></blockquote><p></p>
[QUOTE="mm1352000, post: 1136011, member: 82144"] It is only an indication. The actual values reported and their "accuracy" depend entirely on the tuner driver. About the value range: there is no guarantee that the range is 0..100 (ie. a percentage). Many drivers - I think including DD - do report that way, but some definitely do not. About "accuracy": the values are likely to be averages, and as such they probably won't show very short glitches. Also, they'll often be "quantised" (...which means the driver may only report 0, 10, 30, 50, 80, 100, and no in-between values). So in short: don't rely on the readings too much. I think you're right. The suggested tests should confirm. Note that the signal division is almost certainly equal between tuners 1 and 2, and 3 and 4. However, depending on the implementation, the splitters may be bypassed when only 1 tuner on the card is in use. Also note that cross-tuner interference can be an issue for such splitter + multi tuner designs. That's why I suggested to test each tuner on each card individually, and then also together. Testing properly is important... but quite complex to do correctly. ;) Due to the laws of physics, it's impossible to not lose signal strength when you introduce a splitter. Splitting signal is just like splitting a water hose. The pressure at the end of each split is a proportion of the incoming pressure, and depends on which splits are in use. In the tests you may find that tuner 2 works okay when the second card is disconnected... and that may mean that your incoming signal strength/quality is sufficient for 2 tuners... but not 4. ...and yes, you [I]can [/I]fix such an issue with hardware: an amplifier. In my water hose analogy, if you want to get the same water pressure at each output after a split then you need to increase the pressure at/before the input to the splitter with a valve or pump. An amplifier is the equivalent of a valve/pump for signal. The TV service, TsWriter and TsReader show various PID details if you're interested, but it's a bit complicated. TV channels have at least 2 PIDs - one for video and one for the main audio. Each additional audio language/stream is [usually] an additional PID. DVB subtitles and teletext is another 2 PIDs. My understanding is that CAM limits may be defined by a channel count, or a PID count, or a bit-rate. If your CAM can do 14 PIDs then it may be able to decrypt up to 7 TV channels [each with 1 video stream and 1 audio stream]... or 4 TV channels [each with 1 video stream and 2 audio streams]. [/QUOTE]
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