Limit to m2t capture file size? at DVinfo.net

Lisa Lee · October 9th, 2003, 05:02 PM

1. Is there a limit to the capture file size of m2t files? I can't seem to get them above 2GB.

2. It seems only about 30 min of m2t files can be stored on a DVD-R. But 1 hour of WMP9 files can be stored on a DVD-R. Have you guys noticed any degradation in quality coming from going WMP9 when using this camera?

Gints Klimanis · October 9th, 2003, 05:54 PM

1. This depends on your OS and file system. I have no trouble getting about 2 GBytes on WindowsXP using the NTFS file system.

2. Your WMP9 files probably have a lower bitrate, but the comparison is not simple. There are several factors. Constant Bit Rate (CBR) will produce larger files than Variable Bit Rate (VBR)
for the same upper limit of data rate.
Other factors are the quality of the encode, usually the level of
motion estimation. Also, the audio may be compressed or uncompressed, but it's in the neighborhood of 1/10 to 1/4 or the video data rate.

If you're worried about differences between the two formats,
make a test sequence. One that is used by my coworkers is of a cheerleading squad. The multiple pom-poms just blow up.

Lisa Lee · October 10th, 2003, 12:22 AM

Is there any way to make a 4GB m2t file rather than just a 2GB file?

Gints Klimanis · October 10th, 2003, 12:42 AM

Lisa,

Yes, there's a way. What capture software and O/S are you using? I use a Windows XP system and Pinnacle Studio 8 to
capture DV files larger than 2GB. If you're doing MPEG2 encoding on the fly, you'll need a hardware MPEG2 encoder or a fast computer and good software.

Gints

Gints Klimanis · October 10th, 2003, 12:46 AM

Oh wait, sorry. I just noticed that you're using the HD MPEG2.
I've never used HD or any capture software for HD, so just ignore what I said. Although, you may be limited by your OS and disk file format. What system are you using? Please check your disk file system type.

October 9th, 2003, 05:02 PM	#1
Lisa Lee Regular Crew Join Date: Sep 2003 Posts: 86	Limit to m2t capture file size? 1. Is there a limit to the capture file size of m2t files? I can't seem to get them above 2GB. 2. It seems only about 30 min of m2t files can be stored on a DVD-R. But 1 hour of WMP9 files can be stored on a DVD-R. Have you guys noticed any degradation in quality coming from going WMP9 when using this camera?

October 9th, 2003, 05:54 PM	#2
Gints Klimanis Inner Circle Join Date: Jun 2003 Location: San Jose, CA Posts: 2,222	1. This depends on your OS and file system. I have no trouble getting about 2 GBytes on WindowsXP using the NTFS file system. 2. Your WMP9 files probably have a lower bitrate, but the comparison is not simple. There are several factors. Constant Bit Rate (CBR) will produce larger files than Variable Bit Rate (VBR) for the same upper limit of data rate. Other factors are the quality of the encode, usually the level of motion estimation. Also, the audio may be compressed or uncompressed, but it's in the neighborhood of 1/10 to 1/4 or the video data rate. If you're worried about differences between the two formats, make a test sequence. One that is used by my coworkers is of a cheerleading squad. The multiple pom-poms just blow up.

October 10th, 2003, 12:22 AM	#3
Lisa Lee Regular Crew Join Date: Sep 2003 Posts: 86	Is there any way to make a 4GB m2t file rather than just a 2GB file?

October 10th, 2003, 12:42 AM	#4
Gints Klimanis Inner Circle Join Date: Jun 2003 Location: San Jose, CA Posts: 2,222	Lisa, Yes, there's a way. What capture software and O/S are you using? I use a Windows XP system and Pinnacle Studio 8 to capture DV files larger than 2GB. If you're doing MPEG2 encoding on the fly, you'll need a hardware MPEG2 encoder or a fast computer and good software. Gints

October 10th, 2003, 12:46 AM	#5
Gints Klimanis Inner Circle Join Date: Jun 2003 Location: San Jose, CA Posts: 2,222	Oh wait, sorry. I just noticed that you're using the HD MPEG2. I've never used HD or any capture software for HD, so just ignore what I said. Although, you may be limited by your OS and disk file format. What system are you using? Please check your disk file system type.