pythonaudiovideomergenuke

How to read and write video with audio in Python Foundry Nuke?

I need to merge 2 videos in Python Nuke but also I want to merge their audio channels. However Nuke reads and writes only their video with no audio at all after running the code below:

import nuke

content = nuke.createNode("Read")
content["file"].fromUserText("/content.mp4")

bg = nuke.createNode("Read")
bg["file"].fromUserText("/bg.mov")

merged = nuke.nodes.Merge(inputs=[bg, content])

output = nuke.nodes.Write(file="/output.mov", inputs=[merged])

nuke.render(output)
Solution

  • The Foundry NUKE isn't a video editor, it's a compositing package. So, if you need to merge an audio component with a video component, use Audio File option having a corresponding path (you can read in the same .mov file or choose a separate audio file).

    enter image description here

    Here's how your code should look (I used .mov file with Apple ProRes 4x4 codec):

    import nuke

nuke.nodes.Read(file="/Users/swift/Desktop/TESTED.mov", last=1800)

output = nuke.nodes.Write(file="/Users/swift/Desktop/nuke1920.mov", 
                          file_type="mov", 
                          mov64_audiofile="/Users/swift/Desktop/TESTED.mov")

nuke.render(output)

    Output pane of Script Editor presents no errors:

    enter image description here

    Alternatively, if you need to work with audio tools, use NUKE Studio.

    P.S.

    1. Take into consideration that Non-Commercial NUKE version supports output resolution not greater than 1920x1080. And Non-Commercial NUKE doesn't support mp4 codec, and a processing of more than 10 nodes for Python scripting.

    2. And one more thing – you're trying to render 2 videos but you're outputting only 3 channels – RGB. Make sure you have an appropriate channel set for A and B streams! I don't know what you're trying to accomplish but you may use a Copy node instead of Merge node to render 2 sets of RGBs.