Writeffmpeg is a python script and a node that allows you to render from Nuke directly into ffmpeg. Instead of a 2 step process where you render from Nuke to a temporary image sequence that you then transcode using ffmpeg, this solution writes to a single uint16 cache tiff file and this data gets piped into ffmpeg.
I've included a little to help demo how it works.
| from __future__ import with_statement | |
| from __future__ import print_function | |
| from __future__ import division | |
| import os, sys | |
| import subprocess, shlex | |
| import argparse | |
| import tempfile | |
| import numpy as np | |
| from libtiff import TIFF | |
| import nuke | |
| from sys import platform as __platform | |
| if __platform == "linux" or __platform == "linux2": | |
| _platform = 'linux' | |
| elif __platform == "darwin": | |
| _platform = 'osx' | |
| elif __platform == "win32": | |
| _platform = 'win' | |
| def frames_to_tc(total_frames, frame_rate): | |
| fps_int = int(round(frame_rate)) | |
| smpte_token = ":" | |
| hours = int(total_frames / (3600 * fps_int)) | |
| minutes = int(total_frames / (60 * fps_int) % 60) | |
| seconds = int(total_frames / fps_int % 60) | |
| frames = int(total_frames % fps_int) | |
| return "%02d:%02d:%02d%s%02d" % (hours, minutes, seconds, smpte_token, frames) | |
| def terminal_render(): | |
| parser = argparse.ArgumentParser(description='Render from Nuke to ffmpeg.') | |
| parser.add_argument("nuke_script", | |
| help="Nuke script to render.") | |
| parser.add_argument("-X", "--write", | |
| help="Name of the WriteFFMPEG node to render.") | |
| parser.add_argument("-F", "--framerange", | |
| help="framerange to render. Please specify <start>-<end>.", | |
| required=False) | |
| parser.add_argument("-o", "--output", | |
| help="Output qt to render to. Will use the value of the file knob on the WriteFFMPEG node if not specified.", | |
| required=False) | |
| args = parser.parse_args() | |
| nuke_script = args.nuke_script | |
| nuke.scriptOpen(nuke_script) | |
| node = nuke.toNode(args.write) | |
| node.begin() | |
| write = nuke.toNode('write_tmp') | |
| if args.framerange and "-" in args.framerange: | |
| fr = nuke.FrameRange() | |
| fr.setLast(int(args.framerange.split('-')[-1])) | |
| fr.setFirst(int(args.framerange.split('-')[0])) | |
| else: | |
| node_framerange = node['framerange'].getValue() | |
| if node_framerange and "-" in node_framerange: | |
| fr = nuke.FrameRange() | |
| fr.setLast(int(node_framerange.split('-')[-1])) | |
| fr.setFirst(int(node_framerange.split('-')[0])) | |
| else: | |
| fr = node.frameRange() | |
| tmpimg = tempfile.mkstemp('.tiff', "ffmpeg_temp_")[1] | |
| write['file'].setValue(tmpimg) | |
| framerate = node['framerate'].getValue() | |
| output = node['file'].getValue() | |
| tc = frames_to_tc(fr.first(), framerate) | |
| ffmpeg_args = "ffmpeg -hide_banner -loglevel info -y \ | |
| -f rawvideo -pixel_format rgb48le -video_size {0}x{1} \ | |
| -framerate {2} -i pipe:0 -timecode {3} {4} {5}".format( | |
| node.width(), node.height(), framerate, tc, | |
| node['ffmpeg_args'].getValue(), output) | |
| print(ffmpeg_args) | |
| ffproc = subprocess.Popen( | |
| shlex.split(ffmpeg_args), | |
| stdin=subprocess.PIPE, | |
| stdout=subprocess.PIPE | |
| ) | |
| for i, f in enumerate(fr): | |
| nuke.execute(write, f, f) | |
| print("Rendering frame \t{0} of {1}".format(i, fr.frames())) | |
| img = TIFF.open(tmpimg, mode='r') | |
| img = img.read_image() | |
| img.tofile(ffproc.stdin) | |
| os.remove(tmpimg) | |
| result, error = ffproc.communicate() | |
| if __name__=="__main__": | |
| terminal_render() | |
| def prep(): | |
| nuke.scriptSave() | |
| node = nuke.thisNode() | |
| ffpy = __file__ | |
| ffpy = ffpy.replace('pyc', 'py') | |
| node_framerange = node['framerange'].getValue() | |
| nk_cmd = "{0} -t {1} {2} --write {3} --output {4}".format( | |
| nuke.EXE_PATH, | |
| ffpy, | |
| nuke.root().knob("name").value(), | |
| node.fullName(), | |
| node['file'].getValue()) | |
| print("RENDER COMMAND:\n\t{0}".format(nk_cmd)) | |
| if _platform == "win": | |
| nuke.message("Windows not supported.") | |
| return | |
| if _platform == "osx": | |
| cmd = '''osascript 2>/dev/null <<EOF | |
| tell application "Terminal" | |
| if not (exists window 1) then reopen | |
| activate | |
| do script "{0}" | |
| end tell | |
| EOF'''.format(nk_cmd) | |
| elif _platform == "linux": | |
| # cmd = 'xterm -e "bash {0}"'.format(nk_cmd) | |
| cmd = 'gnome-terminal -e "bash -c \\"{0}; exec bash\\""'.format(nk_cmd) | |
| #cmd = 'gnome-terminal -e "bash -c \\"{0}\\""'.format(nk_cmd) | |
| subprocess.Popen(cmd, shell=True) |
| set cut_paste_input [stack 0] | |
| push $cut_paste_input | |
| Group { | |
| name Writeffmpeg | |
| tile_color 0xbfbf00ff | |
| addUserKnob {20 ffmpeg} | |
| addUserKnob {35 presets M {"Prores 422" "knobs this \{ffmpeg_args \"-c:v prores_ks -profile:v 2 -qscale:v 7 -pix_fmt yuv444p10le -r 24 -vf colormatrix=bt601:bt709 -vendor ap10 -metadata:s encoder=\\\"Apple ProRes 422\\\"\" framerate 24 label \"Prores 422\"\}" "Prores 422 HQ" "knobs this \{ffmpeg_args \"-c:v prores_ks -profile:v 3 -qscale:v 7 -pix_fmt yuv444p10le -r 24 -vf colormatrix=bt601:bt709 -vendor ap10 -metadata:s encoder=\\\"Apple ProRes 422 HQ\\\"\" framerate 24 label \"Prores 422 HQ\"\}" "Prores 4444" "knobs this \{ffmpeg_args \"-c:v prores_ks -profile:v 4 -qscale:v 5 -pix_fmt yuv444p10le -r 24 -vf colormatrix=bt601:bt709 -vendor ap10 -metadata:s encoder=\\\"Apple ProRes 4444\\\"\\\"\" framerate 24 label \"Prores 4444\"\}" "DNxHD 36" "knobs this \{ffmpeg_args \"-c:v dnxhd -profile:v dnxhd -pix_fmt yuv422p -b:v 36M -vf \\\"scale=1920:1080,fps=24000/1001,colormatrix=bt601:bt709\\\"\" framerate 23.976 label \"DNxHD 36\"\}" "DNxHD 115" "knobs this \{ffmpeg_args \"-c:v dnxhd -profile:v dnxhd -pix_fmt yuv422p -b:v 115M -vf \\\"scale=1920:1080,fps=24000/1001,colormatrix=bt601:bt709\\\"\" framerate 23.976 label \"DNxHD 115\"\}" "DNxHD 175" "knobs this \{ffmpeg_args \"-c:v dnxhd -profile:v dnxhd -pix_fmt yuv422p -b:v 175M -vf \\\"scale=1920:1080,fps=24000/1001,colormatrix=bt601:bt709\\\"\" framerate 23.976 label \"DNxHD 175\"\}" "DNxHD 175 10bit" "knobs this \{ffmpeg_args \"-c:v dnxhd -profile:v dnxhd -pix_fmt yuv422p10 -b:v 175M -vf \\\"scale=1920:1080,fps=24000/1001,colormatrix=bt601:bt709\\\"\" framerate 23.976 label \"DNxHD 175 10bit\"\}" "DNxHD 220 10bit" "knobs this \{ffmpeg_args \"-c:v dnxhd -profile:v dnxhd -pix_fmt yuv422p10 -b:v 220M -vf \\\"scale=1920:1080,fps=24000/1001,colormatrix=bt601:bt709\\\"\" framerate 23.976 label \"DNxHD 220 10bit\"\}" "DNxHR HQ" "knobs this \{ffmpeg_args \"-c:v dnxhd -profile:v dnxhr_hq -pix_fmt yuv422p -vf \\\"colormatrix=bt601:bt709\\\"\" framerate 24 label \"DNxHR HQ\"\}" "DNxHR HQX" "knobs this \{ffmpeg_args \"-c:v dnxhd -profile:v dnxhr_hqx -pix_fmt yuv422p10le -vf \\\"colormatrix=bt601:bt709\\\"\" framerate 24 label \"DNxHR HQX\"\}" "DNxHR 444" "knobs this \{ffmpeg_args \"-c:v dnxhd -profile:v dnxhr_444 -pix_fmt yuv444p10le -vf \\\"colormatrix=bt601:bt709\\\"\" framerate 24 label \"DNxHR 444\"\}" "h264 standard" "knobs this \{ffmpeg_args \"-c:v libx264 -profile:v high -crf 15 -preset slow -tune film -pix_fmt yuv420p -g 4 -bf 2 -vf colormatrix=bt601:bt709\" framerate 24 label \"h264 standard\"\}" "h264 intra" "knobs this \{ffmpeg_args \"-c:v libx264 -profile:v high -crf 12 -preset slow -tune film -pix_fmt yuv420p -g 1 -bf 0 -vf colormatrix=bt601:bt709\" framerate 24 label \"h264 intra\"\}" "h264 intra 444" "knobs this \{ffmpeg_args \"-c:v libx264 -profile:v high444 -crf 12 -preset slow -tune film -pix_fmt yuv444p -g 1 -bf 0 -vf colormatrix=bt601:bt709\" framerate 24 label \"h264 intra 444\"\}" "h264 intra 444 10bit" "knobs this \{ffmpeg_args \"-c:v libx264 -profile:v high444 -crf 12 -preset slow -tune film -pix_fmt yuv444p10le -g 1 -bf 0 -vf colormatrix=bt601:bt709\" framerate 24 label \"h264 intra 444 10bit\"\}" "h265 standard 10bit" "knobs this \{ffmpeg_args \"-c:v libx265 -profile:v main10 -crf 15 -preset slow -tune psnr -pix_fmt yuv420p10le -g 2 -bf 0 -vf colormatrix=bt601:bt709\" framerate 24 label \"h265 standard 10bit\"\}" "h265 intra 422 10bit" "knobs this \{ffmpeg_args \"-c:v libx265 -profile:v main422-10-intra -crf 12 -preset slow -tune psnr -pix_fmt yuv422p10le -g 1 -bf 0 -vf colormatrix=bt601:bt709\" framerate 24 label \"h265 intra 10bit\"\}" "h265 intra 444 10bit" "knobs this \{ffmpeg_args \"-c:v libx265 -profile:v main444-10-intra -crf 12 -preset slow -tune psnr -pix_fmt yuv444p10le -g 1 -bf 0 -vf colormatrix=bt601:bt709\" framerate 24 label \"h265 intra 444 10bit\"\}" ""}} | |
| addUserKnob {2 file t "output file"} | |
| addUserKnob {7 framerate R 23 30} | |
| framerate 24 | |
| addUserKnob {1 ffmpeg_args l "ffmpeg args"} | |
| addUserKnob {1 ffmpeg_cmd l "ffmpeg command" t "Enter the path to the ffmpeg executable. \n\nffmpeg without a path will use the environment."} | |
| ffmpeg_cmd ffmpeg | |
| addUserKnob {1 framerange -STARTLINE} | |
| addUserKnob {22 set_framerange l "Set to Input" -STARTLINE T "n = nuke.thisNode()\nfr = n.frameRange()\nn\['framerange'].setValue(\"\{0\}-\{1\}\".format(fr.first(), fr.last()))"} | |
| addUserKnob {22 render l Render T "import ffmpeg_render\nffmpeg_render.prep()" +STARTLINE} | |
| } | |
| Input { | |
| inputs 0 | |
| name Input | |
| xpos -40 | |
| ypos -10 | |
| } | |
| Write { | |
| raw true | |
| file_type tiff | |
| datatype "16 bit" | |
| compression none | |
| checkHashOnRead false | |
| version 486 | |
| name write_tmp | |
| selected true | |
| xpos -40 | |
| ypos 98 | |
| } | |
| Output { | |
| name Output | |
| xpos -40 | |
| ypos 230 | |
| } | |
| end_group |