Church sound
Bill Davidsen
davidsen at tmr.com
Fri Mar 13 21:07:19 UTC 2009
Sam Varshavchik wrote:
> David Miller writes:
>
>> My church has decided that they would like to do digital recording
>> using a computer in place using tape. I have setup a FC10 machine
>> that I plan on using for this. I see several packages that will record
>> but I don't want to have a 700M file. Is there a package that will
>> break the recording into, lets say, 10min files and then be able to
>> burn those to CD as audio tracks with zero time between tracks.
>> At some point later I would like to get a camera and start doing video
>> recording of the service and place of DVD.
>
> mplayer's mencoder should be able to do it. Use it as a no-op filter,
> but specify the -ss and -endpos options to extract a chunk from the
> source video.
>
> mencoder should work for both audio and video files. There's probably an
> mplayer option that dumps the chronological size of the audio/video
> file. Have a script use that to figure out how to chop up the file, then
> invoke mencoder repeatedly to carve out each chunk.
>
Warning, having tried to do that using ffmpeg, if you break at the wrong point
you will lose sync between sound and video. There is a granularity issue which I
don't remember, other than having to play with audio to video offset later to
get it right.
Hint: that same audio time shift can be a life saver if you are recording from a
distance using a zoom lens and a shotgun mic or parabolic audio mic, since the
sound will be delayed. You can shift it back "in sync" with ffmpeg.
--
Bill Davidsen <davidsen at tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot
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