On Sat, Sep 20, 2003 at 10:36:50AM -0700, Steven M. Schultz wrote: > Hi - > > > From: Bernhard Praschinger <[EMAIL PROTECTED]> > > > > Audio: ( Samplerate * Channels * Bitsize ) / (8 * 1024) > > Video: (width * height * framerate * quality ) / (200 * 1024) > > > > You have to add both values together. To get the datarate in kb/sec. > > (640 * 480 * 29.97 * 100) / (200 * 1024) gives 4495 or about 4495 * 8 > kbits/sec (~35900kbits/sec). About half again as much as DV.
Real world numbers: 1 hour 34 minutes of capture on a DC10+. Capture settings of 640x480 frame size, NTSC video, and 0.9.4 driver quality setting of 75. Audio capture on a SBLive at 48khz, 2 channel, 16 bit sample size. The resultant avi files (22 of them) total 40,042,683,356 bytes overall. So, 1h34m = 5,640 seconds. 40,042,683,356 bytes / 5,640 seconds = 7,099,766.55 bytes/second. 7,099,766.55 bytes/sec / 1024 = 6933.366 kbyte/second 6933.366 kbyte/second / 1024 = 6.771 MB/second of actual real capture rate to disk for everything, video, audio, and sync/marker data. And that's at a quality setting of 75, bumping that up to 100 does push lavrec very close to the 10mb/sec data rate to disk using a DC10+. ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
