Can I make a little suggestion. Please could you bare in mind that DVB cards could use this to record several channels on the same multiplex like this not just the one channel, I believe it is one the todo list, but I don't think it has been started excpet for the database changes.
John
Glenn Moloney wrote:
Hi All,
Thanks for comments from everyone. Sorry to be absent for the last few days - I've been slowed down by a nasty cold.
I will proceed with option 2 (or something like it) - though I didn't get far over the weekend.
And thanks for the inducement David :-).
cheers, glenn.
On Thu, 2005-03-31 at 21:49 +1000, David Whyte wrote:
I really like the idea of one and two.
I like the idea of one, just as I hope that soon LiveTV will be implemented like this so that it is a little more stable than the current ring buffer implementation. This will also allow you to change channels and be able to rewind to where you were watching a previous channel.
I think two is the best way of attacking this little problem though, even if feature one did get implemented. I think this would provide a much more stable way of being sure that you only delete the correct bits of recording when that time comes. Also, you are actually recording *two* shows so you should get two copies ;)
I tell you what though, being a fellow Aussie (from BNE), if you get this implemented, let me know and I for one will buy you a carton of XXXX (as in Castelmeine (sp?) for the non-Aussies) or two or whatever your poison may be. I am tired of only being able to record one channel even though I have two tuners.
Thanks mate, Dave
On Thu, 31 Mar 2005 20:09:05 +1000, Glenn Moloney
<[EMAIL PROTECTED]> wrote:
Hi All,
I have a "feature" (well - I call it a feature) I want to implement:
Allow overlapping recordings on one tuner.
I am interested in feedback on how best to implement this feacture - in a manner acceptable to the mythtv powers that be.
I find that I need to allow at least 5 minutes (up to 15 for some networks in Australia) of "overrecording" on each program. If I want to record programs following each other on the same channel - I need to use two tuners. I would rather not use two tuners for this job - at least for the case where the same recording profile is used for both recordings.
As I see it, there are two approaches:
1: The "high-level" approach: A "recording" may be fragmented across several fragments of files on disk. This means little change to the low-level recording code mythtv. Also permits constructing "virtual" recordings from existing recordings (eg. highlights), etc...
2: The "low-level" approach: Allow the output from one tuner to be fed into two files during the overlap period. One approach would be to extend the RingBuffer class to allow two (or more) output files to be attached to each ringbuffer. There will also be some fiddling in tv_rec.h to "do the right thing" during the overlapping recordings, and some changes to how we test if a channel is available for recording, transferring ownership of the ringbuffer, etc...
3: Copy data from the end of the previous recording into the next recording. In this case, we delay the start of the second recording, and copy the data from end of the previous recording file into the new recording file. Needs to happen seamlessly.
I am favouring Option 2 - and have started planning for it.
Obviously there is more to it than I describe here - but you get the idea. The scheduler will need to recognise that these recordings are NOT a conflict (given the first feature is working correctly).
Any suggestions or comments welcome.
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