Thread: Extracting DV audio
Brought to you by:
aeb,
bencollins
From: <And...@no...> - 2000-03-30 15:42:22
|
Hi, I'm now able to store the DV stream to a file, extract the audio and play it back correctly. My program recognizes all audio encoding modes specified by the DV standard (i.e. 48_44.1_32kHz/16 bits/2 ch and 32 kHz/12 bits/4 ch). The DV video decoder is also becoming better and better, it decodes approx. 30 frames/sec on a 400 MHz P2. In order to have real time performance (25 frames/sec for PAL) we can only do the pass 1 decoding. This means that we don't use all information contained in a coded frame since the pass 2 and 3 data is spread all around the coded frame and it takes time to collect it the right way. However, we have added support for pass 2 and 3 which can be used to get better picture quality when for instance grabbing a single frame. In this case you will have a lot more time to do stuff like pass 2 and 3. It doesn't matter if it takes a second longer to store the picture to a file. We still want to release the code but the DV patent issues are a bit tricky... Best regards, Anders Weitman _____________________________________________________________________ Anders Weitman, M.Sc Phone : +46 (0)13 4611341 Development Engineer Fax : +46 (0)13 4611001 Nokia Home Communications Mobile : +46 (0)70 2141319 Diskettgatan 11 E-mail : and...@no... SE-583 35 Linkoping, Sweden Internet : www.nokia.com/multimedia/ |