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The following page has been changed by 161.142.8.74: http://freevo.sourceforge.net/cgi-bin/moin.cgi/FrequentlyAskedQuestions The comment on the change is: Updated tv audio recording FAQ ------------------------------------------------------------------------------ @@ -212,6 +212,48 @@ xset s off xset -dpms }}} + += Why can't I get any sound when I'm watching TV? = + +For watching tv in linux using a tv-tuner card the most common way of getting +the tv sound input is by using a short audio cable that connects on one end +to the tv card and the other end to the line-in jack on a sound card. This +way there is always audio data being pumped to the sound card's line-in. +The most common problem is that the tv-tuner audio output is not connected +correctly to the sound card input (usually line-in). +Alternatively, the line-in has been muted, or the volume turned all the way down. + +Note that freevo upon startup will mute the line-in and set the volume to zero. +You should make sure that TV audio is indeed working properly outside of freevo before +attempting to debug it within freevo. + +In order to verify that tv audio is indeed being received by your sound card, +use a mixer program (e.g., aumix, alsactl) and manually unmute and set the volume for +the line-in. Then try viewing the TV channel from outside of freevo using either mplayer +(you'll need to figure out the command line parameters), tvtime or xawtv / fbtv (for framebuffer mode) +and determine if the sound works correctly. Alternatively, connect the tv audio output from +the tv-card directly to the speakers (be careful about the volume!) if nothing else +seems to be working. + += Why are the TV programs I've recorded totally silent? = + +Now that you've managed to view TV programs correctly from within freevo, the next step is to try and +record it. However, a common problem with recordings is that there's video, but the audio is silent. +The line-in levels are set to a high value, and everything seems fine, right? + +Unfortunately, in order for the recording program to actually record the sound you're hearing so well +via the speakers, you also need to set another parameter: +the "Capture Input". This is toggled using the space-bar from within the mixer program. +In alsamixer, it appears in Red as "CAPTUR" above the audio input that you want to capture +(------ otherwise). In aumix, it toggles between a Red "R" (capturing) and a green "P" (not capturing). + +You MUST enable the capture input even though you can hear the audio clearly through your speakers. + +As an aside, Capture and Muting are two separate things. Mute refers to output to the speakers, +while Capture refers to input that's sent to /dev/dsp (or whichever device is used in your system) +in order for the audio recording to work. The Level determine the loudness of the audio that's +captured or sent to the speakers. + = How do I use the btaudio kernel module to play or capture sound? = For watching tv in linux using a tv-tuner card the most common way of getting @@ -219,9 +261,16 @@ to the tv card and the other end to the line-in jack on a sound card. This way there is always audio data being pumped to the sound card's line-in. Any programs used to play or record this audio must be configured to get the stream -from the line-in channel of the sound card's DSP resource (ie: /dev/dsp0). The -btaudio kernel module provides an alternate method of recording or playing -sound from bt878 tv-tuner cards. +from the line-in channel of the sound card's DSP resource (ie: /dev/dsp0). + +The btaudio kernel module provides an alternate method of recording or playing +sound from bt878 tv-tuner cards directly via the PCI bus, bypassing the sound card input +and potentially result in better A/V sync. + +For tv-tuner cards using other chipsets (e.g., Phillips SAA7134, Conextant cx88) +there are equivalent capabilities available. Go to http://bytesex.org for more information. +Note that SAA7130-based cards do not have this capability and can only capture +audio via the sound-card. From the linux kernel documentation: {{{ ------------------------------------------------------- This SF.Net email is sponsored by The 2004 JavaOne(SM) Conference Learn from the experts at JavaOne(SM), Sun's Worldwide Java Developer Conference, June 28 - July 1 at the Moscone Center in San Francisco, CA REGISTER AND SAVE! http://java.sun.com/javaone/sf Priority Code NWMGYKND _______________________________________________ Freevo-wikilog mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freevo-wikilog
