FLAC bug? Bad save to 24 bit FLAC file -Sound Forge - PC

Subject:FLAC bug? Bad save to 24 bit FLAC file Posted by: ctbarker32 Date:9/21/2008 10:07:12 AM Hi, I encountered an odd thing today. I was working on a recent Zoom H2 recording I made. I recorded at a native 48k/24b resolution. I did all my edits in Sound Forge 9.0e. I saved to PCA just fine. I then went to save to FLAC and after processing I found I had an essentially empty FLAC file. I then tried saving the PCA back to WAV and used the FLAC Frontend to convert the file to FLAC. This worked fine and I had a perfect 48k/24b FLAC file. So, does SF 9.0e have an issue with 24bit files? I've been saving 48k/16b files for months with no issue? -CB
Subject:RE: FLAC bug? Bad save to 24 bit FLAC file Reply by: smithforge Date:1/14/2009 9:10:04 PM I am having a similar problem. I recorded (from analog tape) at 24bit, 192k sample rate. When I render/save as FLAC, the FLAC data appears all flat. The file size of the FLAC file is about the same as the original--it is not empty. I tried rendering as FLAC at lower compression levels. It seemed to work for compression at levels <= 2. However, this was true only if I selected a small portion of the data and rendered only that as FLAC. The original file is large, about 55 minutes, which results in about 4GB of data. If I render as FLAC to a lower sample rate, e.g., 48k or 96k, it works ok, at least for the small portion of data. I am still trying this for the whole file. And I will try it at 16 bits, instead of 24 bits. Any thoughts will be appreciated. S.
Subject:RE: FLAC bug? Bad save to 24 bit FLAC file Reply by: Chienworks Date:1/15/2009 3:57:42 AM Hmmmm. 4GB raises a flag. That's the largest file size that fits in a 32 bit unsigned integer file size descriptor. I wonder if the FLAC format uses 32 bit integers. WAV has a similar problem but uses signed integers, so it's limit is half the size, 2GB.

Subject:FLAC bug? Bad save to 24 bit FLAC file

Posted by: ctbarker32

Date:9/21/2008 10:07:12 AM

Hi,

I encountered an odd thing today. I was working on a recent Zoom H2 recording I made. I recorded at a native 48k/24b resolution. I did all my edits in Sound Forge 9.0e. I saved to PCA just fine. I then went to save to FLAC and after processing I found I had an essentially empty FLAC file. I then tried saving the PCA back to WAV and used the FLAC Frontend to convert the file to FLAC. This worked fine and I had a perfect 48k/24b FLAC file.

So, does SF 9.0e have an issue with 24bit files? I've been saving 48k/16b files for months with no issue?

-CB

Subject:RE: FLAC bug? Bad save to 24 bit FLAC file

Reply by: smithforge

Date:1/14/2009 9:10:04 PM

I am having a similar problem. I recorded (from analog tape) at 24bit, 192k sample rate. When I render/save as FLAC, the FLAC data appears all flat. The file size of the FLAC file is about the same as the original--it is not empty.

I tried rendering as FLAC at lower compression levels. It seemed to work for compression at levels <= 2. However, this was true only if I selected a small portion of the data and rendered only that as FLAC. The original file is large, about 55 minutes, which results in about 4GB of data.

If I render as FLAC to a lower sample rate, e.g., 48k or 96k, it works ok, at least for the small portion of data. I am still trying this for the whole file. And I will try it at 16 bits, instead of 24 bits.

Any thoughts will be appreciated.

S.

Subject:RE: FLAC bug? Bad save to 24 bit FLAC file

Reply by: Chienworks

Date:1/15/2009 3:57:42 AM

Hmmmm. 4GB raises a flag. That's the largest file size that fits in a 32 bit unsigned integer file size descriptor. I wonder if the FLAC format uses 32 bit integers. WAV has a similar problem but uses signed integers, so it's limit is half the size, 2GB.