Andrew Kolakowski wrote:You don't want to convert video between different fps, but rather change audio speed.
What you've have done can either introduce artefact in video or make it jerky.
You need 24p timeline and then before you import your 23.976p clip you need to change its fps in the Clip attributes options to 24p. This way you preserve original frames, just play them a bit faster. Then you have to adjust audio, to match video length. You can do it in Resolve or outside.
Not sure what Resolve offers, but there are tools design specifically for audio speed change. There are different algorithms, so you can get different results, but one thing is quite important here. In case of multichannel audio all channels need to be processed simultaneously in order to keep phase lock. Good tools do it this way. No idea about Resolve, but there is/use to be tool called TimeFactory II which was good.
24 to 23.976 is such a small change that I would definitely not use pitch correction, so then it's rather easy conversion, but maybe some audio engineer can help more.
Audio is for 24p, so can be used as is.
You know, I´d tried change the atributes AFTER and clip went offline. I did it now just like you said, and works. I'm still not sure why changing the atributes before it´s different to the speed process inside the timeline, in technical terms, but, I´ll dig on it.
Thank you both, I´m very grateful.