thanks for reply , but when i specify 10bit format ffmpeg returns error :
/root/ffmpeg-build-static-binaries/bin/ffmpeg -hwaccel_device 0 -hwaccel cuvid -c:v hevc_cuvid -i /home/select/HDR_4k_10bit_5min.mkv -i /home//select/4k_UHD_logo.png -filter_complex "[0:v]hwdownload,format=p010le [base]; [base][1:v] overlay=main_w-overlay_w-15:main_h-overlay_h-15[v]; [v]hwupload_cuda[v]" -map "[v]" -t 00:01:00.000 -gpu 0 -c:v hevc_nvenc -pix_fmt p010le -preset slow -rc cbr_hq -b:v 5000k -maxrate 7000k -bufsize 1000k -acodec aac -ac 2 -dts_delta_threshold 1000 -ab 128k /home/select/HDR_overlay_10bit_1min.mp4
Input #0, matroska,webm, from ‘/home/select/HDR_4k_10bit_5min.mkv’:
…
Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x1600 [SAR 1:1 DAR 12:5], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
…
Stream #1:0: Video: png, rgba(pc), 414x279 [SAR 4685:4685 DAR 46:31], 25 tbr, 25 tbn, 25 tbc
File ‘/home/select/HDR_overlay_10bit_1min.mp4’ already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:0 (hevc_cuvid) → hwdownload
Stream #1:0 (png) → overlay:overlay
hwupload_cuda → Stream #0:0 (hevc_nvenc)
Press [q] to stop, [?] for help
Impossible to convert between the formats supported by the filter ‘Parsed_hwupload_cuda_3’ and the filter ‘auto_scaler_2’
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #1:0