Opened 13 years ago

Closed 10 years ago

Last modified 10 years ago

#3086 closed patch (invalid)

unmute capture card's analog audio out when recording

Reported by: tomfelker@… Owned by: Isaac Richards
Priority: minor Milestone: unknown
Component: mythtv Version: head
Severity: medium Keywords:
Cc: Ticket locked: no

Description

I have an saa7134-based capture card which I'm connecting to my sound card with an analog audio cable. While I'm running tvtime, I can hear the audio through my sound card's aux in. However, in mythtv, this never happens, and so of course no sound is recorded. I finally found a fix here

http://lists-archives.org/video4linux/11319-problem-with-sound-and-mythtv.html

and I've put it into a patch. This fixes the problem for me.

One concern is that nothing in that patch re-mutes the capture card, so if it remains unmuted (haven't tested), that may be bad (though I personally wouldn't care). In the thread I linked to, they were unsure where to put code to re-mute, so I'll leave it to someone who knows their way around the code better than I.

Attachments (1)

mythtv_unmute.patch (781 bytes) - added by tomfelker 13 years ago.
patch to unmute capture card's analog audio out

Download all attachments as: .zip

Change History (3)

Changed 13 years ago by tomfelker

Attachment: mythtv_unmute.patch added

patch to unmute capture card's analog audio out

comment:1 Changed 10 years ago by robertm

Resolution: invalid
Status: newclosed

This appears to be a config/driver issue. Please reopen against trunk (or .22 when released) if it's still an issue.

comment:2 Changed 10 years ago by sphery

Note, also, that there's a setting, "Do not adjust volume" in the V4L card configuration screen, to tell Myth not to adjust the audio (including unmuting it) on frame grabber cards.

Also, Janne just committed support for ALSA audio input for framegrabbers in trunk [21448].

One or both of these will likely fix the issue for you.

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