Blackmagic Forum

I noticed that if you generate proxy media, then the pitch of the audio changes. The tone becomes deeper. When you create multiple proxy media from the same clip the tone gets deeper and deeper? With optimized media this problem does not occur. I think it is probably a bug?

I have several DNx Proxies of GH4 media that are working correctly. Have you tried different formats?

I have tried several ProRes and DNx formats of H.265 media (iPhone 12 Pro, 4K), with all of them I had this problem? If I use optimized media instead, everything works correctly?

jacklib wrote:I have tried several ProRes and DNx formats of H.265 media (iPhone 12 Pro, 4K), with all of them I had this problem? If I use optimized media instead, everything works correctly?

My guess is that this may be related to variable frame rate files from the iPhone. Resolve doesn't play nice with variable frame rate. Optimized media may be creating fixed frame rate proxies.

Interesting... I have now tried a video from a Sony rx100VI (Full HD, H.264), here everything was correct. How can I see if the frame rate is not variable?

jacklib wrote:How can I see if the frame rate is not variable?

Many people, including me use a free program called MediaInfo.

The variable frame rate seems to be the reason, I just tested this with ffprobe

Code: Select all

ffprobe -v quiet -print_format json -show_streams input.xyz | grep "avg_frame_rate"

and the sony clip has - in contrast to the iPhone - a constant frame rate.

Is it generally useful to convert clips with a variable frame rate to a constant frame rate when working with Davinci Resolve?

jacklib wrote:Is it generally useful to convert clips with a variable frame rate to a constant frame rate when working with Davinci Resolve?

Yes. I do.

Based on many reports I've seen here Resolve can do all sorts of strange things when it tries to deal with variable frame rate material.

Are there any specific codecs you should use in DR? I just found the program HandBrake, I think with the tool I can convert the frame rate, codecs and many other things?