-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Zak Wood schrieb: > Hi, > > I am in what I hope is the final stages of editting a small video clip, > with a number of video and audio tracks. Somewhere along the line > though, I've lost the ability to lower audio volume (using the > keyframes). The keyframe line still responds, and I can lower or raise > it, but the track simply doesn't change volume. I am arming/disarming > tracks as recommended, and I've switched gangfaders on and off trying to > find some combo that works. > > I have looked for answers on google and in far too many parts of the > manual, but I'm finding nothing - part of the problem may be that I'm > looking for the wrong thing. > > Any suggestions or help on where to start would be massively appreciated. > > Cheers, > Zak >
Hi Zak maybe I don't understand your problem right. But maybe it is related to the following problem. If not, please ignore my explanations ;-) But I recall an ongoing discussion about a somewhat related problem, which ended with a stalled patch and no real agreement. It's related to the 96db of dynamic range available with 16bit PCM audio. Maybe somehow the original author (or some patch to cinelerra way back) concluded that about -30dB is "practically silence". Thus, now cinelerra got the nasty habit just to switch off the sound when reaching -30dB Of course, this is plain nonsense and on professional equipment you clearly hear a "click" on every fade, cross fade and the like. Moreover, you often need to set athmo at a level way below -30dB But now the problem is: based on the quasi-naive view of sound handling, the fade level display in Cinelerra is largely adjusted to work well with just a range of -30dB. Just extending it to the real range available through the media (96dB or 120dB for 24bit) would cause the rarely used low-level range to take up most of the screen real estate. And, sadly enough cinlerra just doesn't have the necessary program infrastructure so you could ad a "zoom feature" in any reasonable amount of time. I'd guess this to take at least a man month of work in the current code base, if the intention is to do it properly and not introduce other problems. If I recall right, somewhere in CV2.1 there was a patch which at least makes the volume curve show this actual behaviour. Moreover there were debates how it could be changed. But there is the problem that changing the existing behaviour will probably render most existing sessions invalid in a subtle way. And, again, Cinelerra lacks the necessary infrastructure to manage different session formates to retain backwards compatibility. Personally I was marginally involved into this problem, as I was working at that time on my "bezier patch", which I needed to make the fade and camera curves basically usable in a professional setup. This patch would, as an unintended sideffect, introduce a library function which could be used to insert automatically interpolating keyframes to simulate the legacy behaviour on the sound fade; thus it would then be possible to change the meaning of "silence" from -30dB to -96dB. Well -- it came different. I needed about 2 1/2 man months of work to get the bezier changes done (which in a reasonably organised codebase would be about 2 weeks of work at max). Moreover the patch necessarily got so disruptive, that it would be a major liability with regards of merging new upstream versions. Thus, after a first round of review (where Pierre Dumuid greately helped me to improve the patch), this whole effort got somewhat sidelined (and I maintain a private version for just for my own use since then) When professional quality is required, I always do my final sound mix in Ardour. Cheers Hermann V. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAksOvusACgkQZbZrB6HelLLNXgCg7IHXSo/5OTqggVMfUqdcmyTl Od0AoKCm9ZAIjuZbRTcYb32TwuKRFp0b =r/Kj -----END PGP SIGNATURE----- _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
