Maximum supported frame rates for Prores and DNxHR?

[david151]

I am using ffmpeg to convert h264 and h265 from my cameras to Prores and DNxHR. Does anyone know what the maximum supported frame rates are when encoding to Prores and DNxHR? I read DNxHD only goes to 60fps. But what is the limit for Prores and DNxHR? Is is 120fps?

[jagabo]

I just ran a test with ffmpeg. Prores had no problems encoding an 8 bit, 960 fps, 7680x4320 video.

ffmpeg -i input.avs -vcodec prores_ks -profile:v hq -quant_mat:v hq -pix_fmt yuv422p10le -vf zscale=matrixin=709:matrix=709:transferin=709:transfer=709:primariesin=709:primaries=709 "output.mov"

General
Complete name                            :output.mov
Format                                   : MPEG-4
Format profile                           : QuickTime
Codec ID                                 : qt   0000.02 (qt  )
File size                                : 1.43 GiB
Duration                                 : 106 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 116 Gb/s
Writing application                      : Lavf58.20.100

Video
ID                                       : 1
Format                                   : ProRes
Format version                           : Version 0
Format profile                           : 422 HQ
Codec ID                                 : apch
Duration                                 : 106 ms
Bit rate mode                            : Variable
Bit rate                                 : 117 Gb/s
Width                                    : 7 680 pixels
Height                                   : 4 320 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 960.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:2
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 3.676
Stream size                              : 1.43 GiB (100%)
Writing library                          : Lavc
Language                                 : English
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

[david151]

wow I did not know Prores went as high as 960 fps - is this the case for all profiles and resolutions? I remember seeing some documentation saying Prores only went to 120fps, so it's great it goes a lot higher.

What about DNxHR? Any idea what the maximum is with that?

[jagabo]

wow I did not know Prores went as high as 960 fps - is this the case for all profiles and resolutions?

I don't know. I just ran the one quick test with the outrageous frame size/rate using a command line I used in the past.

What about DNxHR? Any idea what the maximum is with that?

No idea.

[david151]

I suspect it's ffmpeg which allows you such a high fps, but I guess it's outside of the official spec for the codec?

I would be interested to see if DNxHR could also work with such high frame rates if using ffmpeg. I am away from home at the moment, so can't do any tests. But would be interested to hear if anyone does any experiment with DNxHR

[jagabo]

Even if the software you're using doesn't allow for higher frame rates you can always lie to the encoder and tell it the frame rate is lower, then change the frame rate back up in your editor. Ie, tell the encoder your 120 fps video is 60 fps. Then tell your editor the 60 fps video is really 120 fps when you import it.