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Dual tuner dvb-s2 on single CI slot?
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<blockquote data-quote="mm1352000" data-source="post: 805662" data-attributes="member: 82144"><p>Hi again babelfish</p><p></p><p></p><p>No. "Decoding" in that context is synonymous for decrypting. "Multichannel decoding" is the ability to decrypt more than one encrypted channel from the same transponder using a single tuner and CAM.</p><p></p><p></p><p>No I did not mean decode in the way that you use it. Each DD tuner can only "decrypt" one channel. There can be multiple tuners on a card and those tuners can share the CAM (so the CAM can decrypt multiple channels for multiple tuners). However, each tuner can only ask the CAM to decrypt one channel. With one card like a Cine S2 that has one CAM connected you can decrypt 2 channels because each tuner can decrypt one channel. However as I said earlier, the wiki is written from the perpective of a tuner, not a card or CAM.</p><p></p><p>Without blaming or mentioning anyone in particular, the team has traditionally used "card" instead of "tuner". I don't know whether that is a German -> English translation thing but I certainly found it very confusing and I do my best to clarify when I see it.</p><p></p><p></p><p>Of course this is true. However not all cards have multiple tuners. Therefore my opinion is that we should use the lowest unit - the tuner rather than the card - for comparison.</p><p></p><p></p><p>Please be reasonable. The DD cards are very good, but you have to use fair measures to compare them with other cards. In my opinion it is fairer to compare tuner vs tuner not card vs card.</p><p></p><p></p><p>I'm not trying to moan and I'm not barely able to admit that the description was wrong. I'm *very* sorry if I came across as rude. Honestly though, you and I seem to have a different perspective. I understand where you're coming from but I don't think you had understood my point: DD multidecrypt is not the same as the MediaPortal multichannel decoding (or "decryption" if you prefer that term) feature.</p><p></p><p></p><p>Up at the top of the wiki is a place to log in. I link it --><a href="http://wiki.team-mediaportal.com/Special:UserLogin" target="_blank">here</a><--. Are you sure you're not able to create an account?</p><p></p><p></p><p>Fair enough. In fact I had already done a very big overhaul on the page when I posted. I hope you like it. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p></p><p>That was not my intension so I'm sorry if I came across that way. My actual intension was to raise this in a place where it won't be "lost". Typically issues with the wiki are raised --><a href="https://forum.team-mediaportal.com/website-forum-wiki-feedback-58/" target="_blank">here</a><-- and comments about specific pages are made at the bottom those pages "inside" the wiki.</p><p></p><p></p><p>For me decrypt == decode. Maybe that is where we have the misunderstanding?</p><p>I'd like to further clarify that the ability to view/record multiple free channels from a single transponder with a single tuner is a similar concept to "multichannel decoding", but it is not the same. I would not call viewing/recording of free (non-encrypted) channels decoding or decrypting. I guess you could say that the signal is simply "processed" by TsWriter/TsReader and then passed on to codecs etc. Again, maybe this is where there is a misunderstanding.</p><p></p><p></p><p>The page describes hardware features. However MP/TV Server must include code that enables those features. Example: DiSEqC switching would not work at all without specific code for each manufacturer (like DD or Hauppauge).</p><p></p><p>The same is true for "multichannel decoding" - we have to add specific code for tuners that support it to get single tuners to decrypt multiple channels. Other software might not do that, but it could if they added similar code.</p><p></p><p>The same is *not* true for DD's MTD. There is no special code for MTD in TV Server. We tell the tuner driver to decrypt channels, but we don't have direct control over the CAM to manage the decrypt requests for all the tuners on the card (and connected via extensions). There is no way that we could add support for MTD to any other card/tuner unless we had the driver code for that card/tuner.</p><p></p><p>In other words, MTD is a DD feature and multichannel decoding is a TV Server feature.</p><p></p><p></p><p>And quite rightly so! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p>It is a truly *great* feature... but it is not a TV Server feature, which is why it is not listed in the wiki.</p><p></p><p></p><p>No of course not. It was one of the first DVB-S2 tuners and has proved to be reasonably stable and reliable.</p><p></p><p></p><p>Definitely - I choose things that I buy in the same way. However I think multichannel decoding was very attractive when MTD was not available. It is still valued highly by some people.</p><p></p><p></p><p>I think it is all about your expectations and perspective. Until the DD cards came along it was literally not possible to get anything better than decrypting multiple channels on a single transponder. Surely that is better than only being able to decrypt one channel per CAM?</p><p></p><p></p><p>One transponder = one frequency.</p><p>Each transponder has a "bouquet" of channels.</p><p>Each LNB "receives" signal from a subset of the transponders available from a single satellite. Usually only one polarity + band is received at a time.</p><p></p><p></p><p>I guess it depends who you ask. As I said earlier, I treat "decode" the same as "decrypt". Also, I think of the ability to record/view multiple channels from a single transponder as different to "multichannel decoding". TV Server can use *any* DVB/ATSC tuner with a BDA driver to enable viewing/recording of multiple free channels. The same is not true for "multichannel decoding" - that is only supported by certain hardware... which is why it is specified on the supported cards page.</p><p></p><p></p><p>I don't know much about tuner circuits and drivers - only the basics. First you have a tuner that tunes the frequency. Then you have a demodulator that takes the QPSK or 8PSK input signal (assuming a satellite tuner) and converts it to a digital MPEG 2 transport stream of 1's and 0's (binary). If a CAM is present, sometime after that the tuner driver or firmware will make all or part of the stream available to the CAM for decrypting... I think. There would certainly be dedicated circuits and driver code for that. The decrypting itself is done in the CAM - the CAM has specific-purpose software (firmware) for decrypting.</p><p></p><p></p><p>I think there has been a bit of a misunderstanding between you and I. It is completely unintentional from my side. Hopefully you have a better understanding of what I mean now. Yes the *CAM* can decrypt more than one channel, but each *tuner* can only decrypt one. TV Server is more focussed on tuners than CAMs or cards, which is why the wiki is written in the way that it is.</p><p></p><p></p><p>Again I'm very sorry if you feel that I was being rude. My intention was:</p><p>1. To make sure that you are aware that there are better places to raise issues about the wiki content.</p><p>2. To let you know that there are ways to contribute to the wiki.</p><p></p><p>:sorry:</p><p></p><p></p><p>Hopefully you can now sign up for an account with the link I gave earlier.</p><p></p><p></p><p>I fully accepted that the comment in the row was misleading, however I stand by my opinion that the description of the feature was accurate. Further, I spent 2-3 hours updating the page and I added a specific comment about MTD to the description of the multichannel decoding feature.</p><p></p><p></p><p>I really take exception to this comment. I hope you can see from this post that I have made a big effort to be polite, explain myself in full, answer your questions... I don't know what more I could do given the circumstances.</p><p></p><p></p><p>The misunderstanding is unfortunate but surely you can accept that it was not intentional? I have moved as quickly as I could to clarify...</p><p></p><p></p><p>I think part of the problem is actually DD's documentation. I find their website *extremely* confusing. I don't say that our wiki is or was perfect and blameless - the comment *was* confusing - but I do say that it is DD's responsibility to explain *their* feature in a way that as many people as possible can understand.</p><p></p><p></p><p>We do the best we can. We're not actively trying to spread misinformation in any way - I hope you understand that. At the end of the day though, it is not our responsibility to explain a feature of somebody else's product. It is the responsibility of the manufacturer. If you have any suggestions about how I can improve the wording of the feature description then I'm very open to it. One thing I am not going to do though is make our wiki a place that advertises certain cards.</p><p></p><p></p><p>Again, it is not our job to inform about the DD card abilities. *Any* software that supports decrypting with a DD card also supports MTD with DD cards.</p><p></p><p>mm</p></blockquote><p></p>
[QUOTE="mm1352000, post: 805662, member: 82144"] Hi again babelfish No. "Decoding" in that context is synonymous for decrypting. "Multichannel decoding" is the ability to decrypt more than one encrypted channel from the same transponder using a single tuner and CAM. No I did not mean decode in the way that you use it. Each DD tuner can only "decrypt" one channel. There can be multiple tuners on a card and those tuners can share the CAM (so the CAM can decrypt multiple channels for multiple tuners). However, each tuner can only ask the CAM to decrypt one channel. With one card like a Cine S2 that has one CAM connected you can decrypt 2 channels because each tuner can decrypt one channel. However as I said earlier, the wiki is written from the perpective of a tuner, not a card or CAM. Without blaming or mentioning anyone in particular, the team has traditionally used "card" instead of "tuner". I don't know whether that is a German -> English translation thing but I certainly found it very confusing and I do my best to clarify when I see it. Of course this is true. However not all cards have multiple tuners. Therefore my opinion is that we should use the lowest unit - the tuner rather than the card - for comparison. Please be reasonable. The DD cards are very good, but you have to use fair measures to compare them with other cards. In my opinion it is fairer to compare tuner vs tuner not card vs card. I'm not trying to moan and I'm not barely able to admit that the description was wrong. I'm *very* sorry if I came across as rude. Honestly though, you and I seem to have a different perspective. I understand where you're coming from but I don't think you had understood my point: DD multidecrypt is not the same as the MediaPortal multichannel decoding (or "decryption" if you prefer that term) feature. Up at the top of the wiki is a place to log in. I link it -->[URL="http://wiki.team-mediaportal.com/Special:UserLogin"]here[/URL]<--. Are you sure you're not able to create an account? Fair enough. In fact I had already done a very big overhaul on the page when I posted. I hope you like it. :) That was not my intension so I'm sorry if I came across that way. My actual intension was to raise this in a place where it won't be "lost". Typically issues with the wiki are raised -->[URL="https://forum.team-mediaportal.com/website-forum-wiki-feedback-58/"]here[/URL]<-- and comments about specific pages are made at the bottom those pages "inside" the wiki. For me decrypt == decode. Maybe that is where we have the misunderstanding? I'd like to further clarify that the ability to view/record multiple free channels from a single transponder with a single tuner is a similar concept to "multichannel decoding", but it is not the same. I would not call viewing/recording of free (non-encrypted) channels decoding or decrypting. I guess you could say that the signal is simply "processed" by TsWriter/TsReader and then passed on to codecs etc. Again, maybe this is where there is a misunderstanding. The page describes hardware features. However MP/TV Server must include code that enables those features. Example: DiSEqC switching would not work at all without specific code for each manufacturer (like DD or Hauppauge). The same is true for "multichannel decoding" - we have to add specific code for tuners that support it to get single tuners to decrypt multiple channels. Other software might not do that, but it could if they added similar code. The same is *not* true for DD's MTD. There is no special code for MTD in TV Server. We tell the tuner driver to decrypt channels, but we don't have direct control over the CAM to manage the decrypt requests for all the tuners on the card (and connected via extensions). There is no way that we could add support for MTD to any other card/tuner unless we had the driver code for that card/tuner. In other words, MTD is a DD feature and multichannel decoding is a TV Server feature. And quite rightly so! :D It is a truly *great* feature... but it is not a TV Server feature, which is why it is not listed in the wiki. No of course not. It was one of the first DVB-S2 tuners and has proved to be reasonably stable and reliable. Definitely - I choose things that I buy in the same way. However I think multichannel decoding was very attractive when MTD was not available. It is still valued highly by some people. I think it is all about your expectations and perspective. Until the DD cards came along it was literally not possible to get anything better than decrypting multiple channels on a single transponder. Surely that is better than only being able to decrypt one channel per CAM? One transponder = one frequency. Each transponder has a "bouquet" of channels. Each LNB "receives" signal from a subset of the transponders available from a single satellite. Usually only one polarity + band is received at a time. I guess it depends who you ask. As I said earlier, I treat "decode" the same as "decrypt". Also, I think of the ability to record/view multiple channels from a single transponder as different to "multichannel decoding". TV Server can use *any* DVB/ATSC tuner with a BDA driver to enable viewing/recording of multiple free channels. The same is not true for "multichannel decoding" - that is only supported by certain hardware... which is why it is specified on the supported cards page. I don't know much about tuner circuits and drivers - only the basics. First you have a tuner that tunes the frequency. Then you have a demodulator that takes the QPSK or 8PSK input signal (assuming a satellite tuner) and converts it to a digital MPEG 2 transport stream of 1's and 0's (binary). If a CAM is present, sometime after that the tuner driver or firmware will make all or part of the stream available to the CAM for decrypting... I think. There would certainly be dedicated circuits and driver code for that. The decrypting itself is done in the CAM - the CAM has specific-purpose software (firmware) for decrypting. I think there has been a bit of a misunderstanding between you and I. It is completely unintentional from my side. Hopefully you have a better understanding of what I mean now. Yes the *CAM* can decrypt more than one channel, but each *tuner* can only decrypt one. TV Server is more focussed on tuners than CAMs or cards, which is why the wiki is written in the way that it is. Again I'm very sorry if you feel that I was being rude. My intention was: 1. To make sure that you are aware that there are better places to raise issues about the wiki content. 2. To let you know that there are ways to contribute to the wiki. :sorry: Hopefully you can now sign up for an account with the link I gave earlier. I fully accepted that the comment in the row was misleading, however I stand by my opinion that the description of the feature was accurate. Further, I spent 2-3 hours updating the page and I added a specific comment about MTD to the description of the multichannel decoding feature. I really take exception to this comment. I hope you can see from this post that I have made a big effort to be polite, explain myself in full, answer your questions... I don't know what more I could do given the circumstances. The misunderstanding is unfortunate but surely you can accept that it was not intentional? I have moved as quickly as I could to clarify... I think part of the problem is actually DD's documentation. I find their website *extremely* confusing. I don't say that our wiki is or was perfect and blameless - the comment *was* confusing - but I do say that it is DD's responsibility to explain *their* feature in a way that as many people as possible can understand. We do the best we can. We're not actively trying to spread misinformation in any way - I hope you understand that. At the end of the day though, it is not our responsibility to explain a feature of somebody else's product. It is the responsibility of the manufacturer. If you have any suggestions about how I can improve the wording of the feature description then I'm very open to it. One thing I am not going to do though is make our wiki a place that advertises certain cards. Again, it is not our job to inform about the DD card abilities. *Any* software that supports decrypting with a DD card also supports MTD with DD cards. mm [/QUOTE]
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