resample/render quality -Sound Forge - PC - MAGIX Community Forums Archive

Subject:resample/render quality Posted by: joejon Date:7/27/2004 6:37:20 PM I had completed a fairly big project; at least big for what I do. I had to do a lot of editing because I recorded the music live (a lot of noise). I video taped the concerts and captured on my computer with Vegas. I then saved as a .wav file to cut the video and just work with the sound in Sound Forge. Up until now I've always used the default settings. I noticed that Vegas and CD Architect have the defaults set at Good for resample/render quality. Is this usually what it should be set at or should it be set to Best? Is there that big of difference? I hate to think of starting all over and re-editing everything, but if there is a huge difference I may do that. If there are any other settings I should take a look at, let me know. Thanks for any suggestions.
Subject:RE: resample/render quality Reply by: Chienworks Date:7/28/2004 4:38:36 AM If there is no resampling going on then it doesn't make any difference. The only time this should matter is if you change the sample rate or bit depth. You probably aren't doing that, so don't worry about it.
Subject:RE: resample/render quality Reply by: joejon Date:7/28/2004 8:43:57 AM My video camera records at 48 KHz, so I do have to resample to 44 KHz sometime before I burn to a CD.
Subject:RE: resample/render quality Reply by: Rednroll Date:7/28/2004 11:32:53 AM I wouldn't worry about it, I haven't heard any bad audio with the "good" setting. More pertaining to your scenario, you should be fine because you are down sampling going from 48Khz to 44.1khz. This setting would become more important when you are upsampling. When you are upsampling (ie increasing the sampling rate from the original sampling rate), then samples must be "interpolated". That is a best guess must be taken into account. Therefore, when upsampling it will look at the value of sample "1", and sample "2", and then it must add a sample inbetween them, by taking a good educated guess of what the value should be, between the 2 original samples. My guess is for the highest setting rather than just looking at the 2 samples, it looks at a few samples and comes up with a better educated guess for the interpolated samples, thus more overhead processing power. The end answer, may still be the same, for "good" vs "excellent", it's just using more samples to make a better guess of the interpolated samples. For future projects if you have Sound Forge, I recommend resampling your files to your Vegas project sample rate, and use the best setting in Sound Forge. Also, when downsampling in your scenario, be sure to check the "anti-aliasing" filter. I have never been a fan of realtime resampling, and that's what Vegas has to do, to allow multiple sample rate files in the same project. If you resample all your 48Khz files to 44.1Khz in Sound Forge first, then Vegas will not have to do any realtime sampling during playback. This ensures you get the best resampling quality, and it also cuts down on the resources that Vegas has to run in the background, thus giving you more processing power for your mixing and editing.
Subject:RE: resample/render quality Reply by: joejon Date:7/28/2004 12:39:21 PM Thanks for your input and advice. I guess it probably wouldn't be worth redoing my projects if it won't make much of a difference. I posted some time ago about Sound Forge giving me an error message occassionally when I try to save my files. They are origingally at 48 khz. When I change the sample rate to anything else, SF then lets me save. Then I change the sample rate back to the original 48 khz and it lets me save. This is done before I resample the file. Is this just a weird fluke in the program or is there a reason that it does this?

Subject:resample/render quality

Posted by: joejon

Date:7/27/2004 6:37:20 PM

I had completed a fairly big project; at least big for what I do. I had to do a lot of editing because I recorded the music live (a lot of noise). I video taped the concerts and captured on my computer with Vegas. I then saved as a .wav file to cut the video and just work with the sound in Sound Forge. Up until now I've always used the default settings. I noticed that Vegas and CD Architect have the defaults set at Good for resample/render quality. Is this usually what it should be set at or should it be set to Best? Is there that big of difference? I hate to think of starting all over and re-editing everything, but if there is a huge difference I may do that. If there are any other settings I should take a look at, let me know.
Thanks for any suggestions.

Subject:RE: resample/render quality

Reply by: Chienworks

Date:7/28/2004 4:38:36 AM

If there is no resampling going on then it doesn't make any difference. The only time this should matter is if you change the sample rate or bit depth. You probably aren't doing that, so don't worry about it.

Subject:RE: resample/render quality

Reply by: joejon

Date:7/28/2004 8:43:57 AM

My video camera records at 48 KHz, so I do have to resample to 44 KHz sometime before I burn to a CD.

Subject:RE: resample/render quality

Reply by: Rednroll

Date:7/28/2004 11:32:53 AM

I wouldn't worry about it, I haven't heard any bad audio with the "good" setting. More pertaining to your scenario, you should be fine because you are down sampling going from 48Khz to 44.1khz. This setting would become more important when you are upsampling. When you are upsampling (ie increasing the sampling rate from the original sampling rate), then samples must be "interpolated". That is a best guess must be taken into account. Therefore, when upsampling it will look at the value of sample "1", and sample "2", and then it must add a sample inbetween them, by taking a good educated guess of what the value should be, between the 2 original samples. My guess is for the highest setting rather than just looking at the 2 samples, it looks at a few samples and comes up with a better educated guess for the interpolated samples, thus more overhead processing power. The end answer, may still be the same, for "good" vs "excellent", it's just using more samples to make a better guess of the interpolated samples.

For future projects if you have Sound Forge, I recommend resampling your files to your Vegas project sample rate, and use the best setting in Sound Forge. Also, when downsampling in your scenario, be sure to check the "anti-aliasing" filter. I have never been a fan of realtime resampling, and that's what Vegas has to do, to allow multiple sample rate files in the same project. If you resample all your 48Khz files to 44.1Khz in Sound Forge first, then Vegas will not have to do any realtime sampling during playback. This ensures you get the best resampling quality, and it also cuts down on the resources that Vegas has to run in the background, thus giving you more processing power for your mixing and editing.

Subject:RE: resample/render quality

Reply by: joejon

Date:7/28/2004 12:39:21 PM

Thanks for your input and advice. I guess it probably wouldn't be worth redoing my projects if it won't make much of a difference.
I posted some time ago about Sound Forge giving me an error message occassionally when I try to save my files. They are origingally at 48 khz. When I change the sample rate to anything else, SF then lets me save. Then I change the sample rate back to the original 48 khz and it lets me save. This is done before I resample the file. Is this just a weird fluke in the program or is there a reason that it does this?