This is known as 5C encryption, and channels encrypted with it cannot be accessed via FireWire. At the very least it is much more common to have non 5C-encrypted channels than unencrypted QAM channels, so it is often the best way to record digital cable. The downside is that using this method you must rely upon a rented piece of hardware from your cable company that may be subject to change. And because of the variety of cable boxes on the market, it is impossible to support all of them, and at this point Myth's FireWire support should be considered young.
It works rock solid for some, but for many it is less then percent reliable and can require considerable tweaking to get working in such a manner. This support is improving considerably with each release, however. Also, as cable companies are only required by law to provide cable boxes with FireWire output for high definition subscriptions, you may have to pay extra to get such a box as most companies charge extra for high definition enabled cable service.
To check if your channels are provided in the clear via FireWire, you must attempt to tune them via the FireWire interface or use a cable box that has a diagnostic menu that is capable such as many Motorola set top boxes of giving the 5C status of individual channels.
Alternatively you can contact your local cable company, but as mentioned earlier, that may prove to be a frustrating experience. You can ask others who may live in the same area as you what they have found with their FireWire setup, but as individual franchises can have different 5C setups, this should not be taken to be infallible. Compatible devices use a CableCARD rented from a cable company—usually for much less than for a cable box, and sometimes for free—and will allow encrypted channels to be decrypted and recorded by MythTV.
As with FireWire capture, for non-Windows users this method is restricted to those channels marked "copy freely". There are exceptions with all of these companies, so it bears some research into the topic before investing in hardware. With this method, a set top box rented from the cable company is used access your digital cable channels via its analog outputs, which is then recorded with an analog, non high-definition tuner card such as the PVR Channels are changed via an IR blaster while the analog tuner card records the output of the box either through a coax, composite, or s-video input.
This is no longer required and will likely be phased out. You need a FireWire card in your backend and an appropriate cable to connect the set top box. Low cost FireWire cards are available. Each device can hold one cablecard from the cable company. Each device can receive up to 6 channels simultaneously, depending on the model. The Ethernet devices require no Linux driver.
This is of interest in countries that have not switched to Digital transmission. It may be difficult to obtain these tuners since most countries have switched to digital broadcast. To determine if your device will be supported, visit the Wiki. There are articles about each type of tuner supported. These are TV tuners that capture analog TV. They may also support capture of composite output from a converter box Standard Definition only.
If you need to test the backend but do not have a tuner, you can use this. It creates a dummy tuner that simply copies from a file you supply when making a "recording". You can also use this to import files with an event. This recorder requires an MPEG file and it will copy slowly as if recording, i.
Jump to: navigation , search. Category : Configuring MythTV. Navigation menu Personal tools Log in. You will probably have to leave your STB box on as well. Similar to number 3 above. In addition, you will need an audio in jack on your capture card as well as an Svideo in or composite in. In this setup, you will also need a channel changer IR blaster or possibly a serial cable and channel change script so that Myth can change the channel on the STB. The Input connections choices in mythtv-setup are shown below.
In the MythTv setup program mythtv-setup you define Tuner cards and Input connections. The inputs are the different ways you can connect to your card, such as the coax port tuner , the composite or svideo port combined with audio in.
On a single card such as the Happpauge PVR , you can use both cable in and svideo in, not at the same time though. You can connect each Input source to a different channel lineup. Below is the configuration page for an input source. After you choose an input connection to define, you can specify the channels associated with the input source and you can optionally tell Myth how to change channels. The exernal command is required when you have a set top box and an IR blaster and you need to call lirc to change the channel on your STB.
FireWire is the often the first choice for HD. This is because programs captured over Firewire won't incur a quality loss from having been decoded and reencoded. Cable providers vary in the number of channels that you can receive over the firewire port, normally you can get the local HD broadcast channels and some SD broadcast channels.
Channel changing works. Records Fedora HD channels 2. Channels above 13 record fine via STB. Using Mythbuntu Same process as theirs. Using gentoo. Works in Broadcast Mode at megabits. Channel change works great with ch script no modifications required except to specify the node id in ch source before compile. I have seen stability differences between external FW card and internal FW.
Ptp does not work. Firewire on STB seems to not want to "come on" right away. Play around with different methods of booting the box with FW attached. P2P mode is a dud on this model's firmware. Subscribed movie channels with Pacific offset capture as expected. Capture of these channels die with the PAT too large error. Strangely, this appears to be mostly SD channels and possibly east coast originating channels speculation.
Mythbackend will not get a lock and capture without modifying firewiresignalmonitor. Even then some channels are not usable because mythfrontend may get confused when trying to playback the non-compliant transport stream. Research on the mailing list confirms that there are several other users with similar problems with the RNG, whether they know it or not.
Works perfectly, and even seems to be stable with live TV. Firewire chipset seems to be very important. Your mileage may vary, but if you're having trouble, definitely try a different Firewire controller. Fedora 14 x Point-to-point at Mbps is very stable broadcast works also. Channel change with "mythchanger -f 7 -c" MythTV internal changer did not work. Before getting DCX I had DCH - which worked only in in broadcast mode, and would refuse changing channels after every few days required power reset and re-priming to fix, very annoying.
DCX works much better! Using Point-to-Point everything works perfectly. I originally tried broadcast, but kept getting errors.
0コメント