Andrew,
In testing the dnxhd.qt file that you had attached on the email, in the Fedora operating system I found that the Render menu lines when you select the Video wrench, displays only about the first 18 lines (or a certain number of characters). Therefore all that the user will see is the following and will not see the other 50 informational lines and not know what to pick.
mov dnxhd
b=120M
# video parameters incompatible with DNxHD. Valid DNxHD profiles:
# Frame size: 1920x1080p; bitrate: 175Mbps; pixel format: yuv422p10
# Frame size: 1920x1080p; bitrate: 185Mbps; pixel format: yuv422p10
# Frame size: 1920x1080p; bitrate: 365Mbps; pixel format: yuv422p10
# Frame size: 1920x1080p; bitrate: 440Mbps; pixel format: yuv422p10
# Frame size: 1920x1080p; bitrate: 115Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 120Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 145Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 240Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 290Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 175Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 185Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 220Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 365Mbps; pixel format: yuv422p
# Frame size: 1920x1080p; bitrate: 440Mbps; pixel format: yuv422p
# Frame size: 192
Although this is very helpful, maybe this is just too much information for most users or just the exceptions to yuv422p should be itemized? i.e. yuv422p10, yuv444p10, gbrp10 .
Andrea,
even though DNxHR does not work for you, could you see if Arch also cuts this file off? You just have to replace the current dnxhd.qt file into Cinelerra ... /bin/ffmpeg/video. You might have to restart Cinelerra and then bring up the Render manu, choose FFMPEG and qt and then video wrench for dnxhd. Look at the comments and see if they are cut off. Thanks.