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EDIUS does automatically change the timeline frame rate to match a file. If your project is set to 59.94i and you drag a 24p clip in, EDIUS will try to conform it. However, if that 24p clip has a non-standard timecode or variable frame rate (common with screen recordings or smartphone video), you will see the error.
: Sometimes EDIUS tries to use a hardware output device that doesn't support your current project format. System Settings Preview Device to see if your output hardware is causing the conflict. Quick Troubleshooting Checklist H.264 Exporter Not Showing - Grass Valley Forums
Ensure audio is set to 2 channel stereo 48000Hz , as some exporters will fail if the audio format is non-standard. 2. Hardware Encoder Issues (Quick Sync)