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When you render something, Blender will automatically append the frame number to all output files' names, producing filenames something like render_0001.png, render_0002.png, render_0003.png, etc.

For frames of an animation this is great, since it keeps the same file from being overwritten for each frame. But for videos this is usually unnecessary. Is there a way to keep Blender from adding the frame number to every render output file?

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Do you mean that blender adds the frame range to file name, say test0001-0025.mp4? Or does it save multiple files? – maegmaeg Jan 31 at 22:19
    
@maegmaeg For your example, I just want it to output test.mp4 and not concatenate the frame range to the end of the name. – PGmath Jan 31 at 22:20

Simply put test.mp4 as the ouput not just test without the file extension.

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this is working with VSE but not with rendering an animation. At least it did not work for me with avi. It ignores test.avi and creates test_avi0001-0050.avi – maegmaeg Jan 31 at 23:10
    
Argh my fault. I used an underscore and no period. You are right! – maegmaeg Jan 31 at 23:11

Specify the full filename and disable file extensions. Adding file extensions includes adding the frame number to the filename.

Output panel

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EDIT: As @ferhoyo points correctly out, you just have to add the file extension, say test.mp4 or test.avi.

I don't think it is possible. In the official documentation it says:

When rendering an animation, the frame number is appended at the end of the file name with 4 padded zeros (e.g. image0001.png). You can set a custom padding size by adding the appropriate number of # at the end of the file name (e.g. image_##.png would translate to image_01.png).

Probably you can shorten the output with test# to say test01-25.mp4

Why do you save to a movie format at all? An image sequence has so many advantages...

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As for why I save to a movie format: 1. even if you save to an image sequence first when rendering animations (which I do), you then combine it in the VSE and output as a movie, and 2. I often use the VSE for general video editing stuff in which case I need to output a movie file. – PGmath Jan 31 at 22:33
    
Ah, it happens with VSE too... As i wrote above i don't think it is possible to change. – maegmaeg Jan 31 at 22:41

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