Opened 13 years ago
Closed 13 years ago
#4471 closed patch (fixed)
Glitches in multirec using DVB-S
Reported by: | Owned by: | Janne Grunau | |
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Priority: | minor | Milestone: | 0.21 |
Component: | dvb | Version: | head |
Severity: | medium | Keywords: | |
Cc: | Ticket locked: | no |
Description
I get glitches on a recording/LiveTV when switching channels (on the same transponder) using multirec. I traced the problem to this in dvbchannel.cpp:
if (is_dvbs) { // make sure we tune to frequency, no matter what happens.. reset = first_tune = true;
Which causes FE_SET_FRONTEND to be called even when not switching transponders. This causes a momentary glitch in the stream using my card. What is the reason for this code, and can we change/remove it?
Attachments (3)
Change History (13)
comment:1 Changed 13 years ago by
Component: | mythtv → dvb |
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Milestone: | unknown → 0.21 |
Owner: | changed from Isaac Richards to danielk |
Version: | unknown → head |
Changed 13 years ago by
Attachment: | t4473.diff added |
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comment:2 Changed 13 years ago by
t4473.diff should work too. It is forcing only a reset if the card is not locked.
comment:3 Changed 13 years ago by
If someone on irc remembered correctly the forced retune is needed for
Two satellites with the same transponder frequencies. Dish rotates, but no lock, ISTR.
in that case the patch won't help.
comment:4 Changed 13 years ago by
the fix that was committed in #15441 works fine for me so far. If the problem is with rotors or switches and retuning to the same transponder, the fix would be to force a reset whenever a switch/rotor command is issued. I'll try out t4473 in the meantime.
Changed 13 years ago by
Attachment: | t4473_v2.diff added |
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comment:5 Changed 13 years ago by
Type: | defect → patch |
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yes, I was working on that. please try t4473_v2.diff
comment:6 Changed 13 years ago by
The reason for the re-tune is because we temporarily raise the voltage to 17V when rotating a rotor with DiSEqC. Janne's second patch should be the fix the glitches without causing the H/V setting to be incorrect after a rotation of the dish.
comment:7 Changed 13 years ago by
no, as Shane pointed out on irc it won't work since the slave calling the master Tune() with same_input == false.
Changed 13 years ago by
Attachment: | t4473_v3.diff added |
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comment:8 Changed 13 years ago by
Owner: | changed from danielk to Janne Grunau |
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Status: | new → accepted |
t4473_v3.diff caches the lnb device id and enforces retuning only if it changed.
comment:10 Changed 13 years ago by
Resolution: | → fixed |
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Status: | accepted → closed |
code was added in [10493] to make retuning work
I'll comment it until we find a proper solution.