[mythtv-users] How to issue command when starting a new recording?

[Jack Wrobbel]

On Wed, 2005-10-05 at 03:16, kanetse at gmail.com wrote:
> I have this problem where (for some unknown reason), MythTV will mute
> my TV card's audio out periodically.  This results in recordings with
> no audio.  It's not a frontend or sound card issue.  I have found it
> can be re-enabled by issuing a command to the v4l driver, namely,
> "v4lctl volume mute off".
>  

I saw this with my BT card quite a while ago.  The following patch
seemed to fix it for me. It unmutes the card whenever a recording
starts.  YMMV

  Jack

Index: libs/libmythtv/NuppelVideoRecorder.cpp
===================================================================
--- libs/libmythtv/NuppelVideoRecorder.cpp      (revision 7195)
+++ libs/libmythtv/NuppelVideoRecorder.cpp      (working copy)
@@ -1033,16 +1043,32 @@
         perror("VIDIOCGCHAN");

     // if channel has a audio then activate it
+/* jmw start */
+#if 0
     if (!skip_btaudio && (vchan.flags & VIDEO_VC_AUDIO) ==
VIDEO_VC_AUDIO) {
+#else
+    if ((vchan.flags & VIDEO_VC_AUDIO) == VIDEO_VC_AUDIO) {
+#endif
+/* jmw end */
         if (ioctl(fd, VIDIOCGAUDIO, &va)<0)
             perror("VIDIOCGAUDIO");

+
+/* jmw start */
+        VERBOSE(VB_GENERAL, "-----------Unmuting BTTV
card----------------");
         va.flags &= ~VIDEO_AUDIO_MUTE; // now this really has to work

-        va.volume = volume * 65535 / 100;

+        if (!skip_btaudio ) {
+            va.volume = volume * 65535 / 100;
+        } else {
+            VERBOSE(VB_GENERAL, "Would have skipped Unmute.");
+        }
         if (ioctl(fd, VIDIOCSAUDIO, &va) < 0)
             perror("VIDIOCSAUDIO");
+
+        
+/* jmw end */
         //if (ioctl(fd, VIDIOCSCHAN, &vchan) < 0)
         //    perror("VIDIOCSCHAN");
     }