file size after stripping audio from DV

[dADDo]

I have been stripping audio tracks from some early mmv videos I made ages ago because I want to remake them but the video is not so good as I would like, as you can imagine.

I'm using Premiere Pro to isolate audio, sending to Soundbooth and chopping around etc and saving as .wav file etc.

Not a problem once I learned the ropes but what I cannot get my head around is why the resultant .wav file is multiples larger than the original vid+aud file (for example orig. movie 2.7MB > stripped .wav file 7MB!!!)

Surely the new file cannot be of higher quality than the original and is there a better way to do it?

cheers....

[JohnnyMalaria]

According to your post's title, you have DV files, correct?

2.7MB of PAL DV is about 3/4 second.

7MB of 16-bit 44.1kHz stereo audio is about 83 seconds.

So I think your numbers are inconsistent.

Can you confirm the DV file size?

Each second of PAL DV is (144000 * 25 = 3,600,000 ) bytes of which 88,200 is audio. Most of the remainder is compressed video. 7MB of audio would come from slightly less than 28MB DV.

[dADDo]

JohnnyMalaria...hmmmm?

the 2 movies I have experimented on may NOT be in fact DV movies as they are Windows Movie Maker .wmv productions of 320 x 240/364kbs/2.64MB and 320 x 240/618kbs/3.3MB

the resultant audio only .wav files are 7.67MB and 9.33MB respectively.

Whereas I'm creating audio files from these files at a much higher rate??

Is it possible to chose some lower conversion rate so I don't waste my time and disc space?

Need to look into it.......or perhaps you know?

[manono]

Standard PCM WAV audio (48 kHz, 16 bit, Stereo) has a bitrate of 1536 kbps. It's understandable that the WAV files are much larger than your WMVs. As you were wrong about the kind of video you have, so you are wrong about what you're doing with the audio. You're not just stripping it, but converting it to WAV audio from whatever's in the videos to begin with, WMA audio most likely.

[guns1inger]

Your video certainly isn't DV anymore. The bitrate for a standard uncompressed wav file is a lot higher than the heavily compressed video/audio you have in your original files. You could look at using MP3 at 128 kbps instead of WAV.

[Midzuki]

dADDo, I do not understand why you feel surprised.
WAV files mean uncompressed audio, whereas the .wma tracks in the ASF
container mean lossy compression. 7MB of 16-bit stereo PCM last around 40
seconds, whereas the equivalent wma stream (typically @ 64kbps) should occupy
around 350kB of disk space.

P.S.: Yes, I do need to learn how to type faster! =^.^=

[dADDo]

Thx guys (& gals?)...there is no question as a noob I need to study this audio stuff more- the more you learn the more you realise you don't know!!!

The MP3 tip seems the way to go with these "low rent" vids.

I'm a geezer promoting old time skills via my web site and doing/learning on the job - it's fun and wish I were 30 again so I can only thank you all for your input.