Hi all, Since this is my first e-mail to the list, let me start with: Thanks for this wonderful project!!! very useful indeed. I was trying to compress some big files and then to access to small portions and decode only those parts. I use the streaming mode(the sample codes provided on the web-site) without the Ogg packaging which seems useful to me for seeking in time. When I seek in time by just skipping packages, reset by: speex_decoder_ctl(state, SPEEX_RESET_STATE, NULL); and starting decoding, I see that the quality of decoding varies depending on the initial frame characteristics. It seems that the signal gets close to the original quite fast when the first frames are unvoiced. If I start decoding in the middle of a voiced chunk then decoding quality is comperatively much lower, more frames are needed until the signal gets closer to the original. This was the feedback part. So the obvious question is: do you know an easy way to get rid of this problem? Thanks. Regards, Baris __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
> I was trying to compress some big files and then to > access to small portions and decode only those parts. > I use the streaming mode(the sample codes provided on > the web-site) without the Ogg packaging which seems > useful to me for seeking in time. > When I seek in time by just skipping packages, reset > by: > speex_decoder_ctl(state, SPEEX_RESET_STATE, NULL); > and starting decoding, I see that the quality of > decoding varies depending on the initial frame > characteristics. It seems that the signal gets close > to the original quite fast when the first frames are > unvoiced. If I start decoding in the middle of a > voiced chunk then decoding quality is comperatively > much lower, more frames are needed until the signal > gets closer to the original. > > This was the feedback part. So the obvious question > is: > do you know an easy way to get rid of this problem?I do not know how you could get rid of the problem, but you could mask it by starting the decode a few frames early, and throwing away the audio for those early frames. Then the decode state will have converged when you start decoding the audio that you want. Regards, Jim Crichton