Problem
HEVC exports fail on a subset of clips because hardware encoding cannot handle a particular source profile.
Solution
Root Cause / Diagnostic:
Consumer hardware HEVC (H.265) encoders have strict silicon-level profile restrictions. Many older GPUs support 10-bit 4:2:0 HEVC encoding but lack hardware silicon for 10-bit 4:2:2 or specific intra-frame profile variations. When an NLE passes a sequence containing unsupported 10-bit 4:2:2 intermediate clips directly to the hardware encoder, the graphics driver returns an invalid parameter error, crashing the export queue at the exact timecode of the incompatible clip.
Actionable Fix:
1. In the export settings panel, change the HEVC encoding tier/profile to 'Main 10' with 4:2:0 chroma subsampling, or switch the Render Engine from 'Hardware Accelerated' to 'Software Encoding'.
2. Transcode problem source clips to intermediate ProRes 422 HQ or DNxHR HQX master files before placing them into the delivery sequence.
3. Perform a test queue render across the problematic timecode range to confirm that the encoding progress bar traverses the clip without driver exceptions.
Pro Tip:
Check your GPU's exact NVENC or QuickSync matrix specifications; if 10-bit 4:2:2 HEVC export is required for broadcast master delivery, utilize software encoding via FFmpeg or an Apple Silicon workstation supporting native 4:2:2 hardware HEVC.
Consumer hardware HEVC (H.265) encoders have strict silicon-level profile restrictions. Many older GPUs support 10-bit 4:2:0 HEVC encoding but lack hardware silicon for 10-bit 4:2:2 or specific intra-frame profile variations. When an NLE passes a sequence containing unsupported 10-bit 4:2:2 intermediate clips directly to the hardware encoder, the graphics driver returns an invalid parameter error, crashing the export queue at the exact timecode of the incompatible clip.
Actionable Fix:
1. In the export settings panel, change the HEVC encoding tier/profile to 'Main 10' with 4:2:0 chroma subsampling, or switch the Render Engine from 'Hardware Accelerated' to 'Software Encoding'.
2. Transcode problem source clips to intermediate ProRes 422 HQ or DNxHR HQX master files before placing them into the delivery sequence.
3. Perform a test queue render across the problematic timecode range to confirm that the encoding progress bar traverses the clip without driver exceptions.
Pro Tip:
Check your GPU's exact NVENC or QuickSync matrix specifications; if 10-bit 4:2:2 HEVC export is required for broadcast master delivery, utilize software encoding via FFmpeg or an Apple Silicon workstation supporting native 4:2:2 hardware HEVC.