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I'm trying to render all individual strips that I have in the video sequence editor in separate files automatically.

I started this script:

import bpy

scene = bpy.context.scene
all_strips = list(sorted(scene.sequence_editor.sequences, key = lambda x: x.frame_final_start))

bpy.data.scenes["Scene"].render.filepath = "/Users/***/Blender/mkv/"
bpy.data.scenes["Scene"].render.image_settings.file_format = "FFMPEG"

for strip in all_strips:
    if strip.type == "MOVIE":
        start = strip.frame_final_start
        end = strip.frame_final_end
        bpy.context.scene.frame_start = start
        bpy.context.scene.frame_end = end
        bpy.ops.render.render(animation=True, use_viewport=True)

but I always get this error:

Traceback (most recent call last):
  File "<blender_console>", line 7, in <module>
  File "/Applications/Blender.app/Contents/Resources/2.79/scripts/modules/bpy/ops.py", line 189, in __call__
    ret = op_call(self.idname_py(), None, kw)
RuntimeError: Error: Could not open file for writing

Is there something wrong with bpy.ops.render.render(animation=True, use_viewport=True), with some context maybe?

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    $\begingroup$ Check your permissions to write to that filepath, or if it even exists. The error is telling you it cannot open the file for writing. $\endgroup$
    – batFINGER
    Feb 15, 2018 at 11:42
  • $\begingroup$ I feel so stupid. I had checked that the directory indeed existed and that I had the right to write in it, but it seems that by specifying bpy.data.scenes["Scene"].render.filepath = "/Users/***/Blender/mkv/" Blender tries to create the file with the directory name (I thought Blender added automatically the filename with the start and end frames but whatever...). I changed it to: bpy.data.scenes["Scene"].render.filepath = "/Users/***/Blender/mkv/" + str(n_strip) + ".mkv" inside the loop and it now works perfectly. Many thanks for the hint! $\endgroup$
    – G Viaud
    Feb 15, 2018 at 12:04
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    $\begingroup$ Hi. If you have an answer, please post it in the answer box below. $\endgroup$
    – Ray Mairlot
    Feb 15, 2018 at 12:37

1 Answer 1

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It seems that by specifying:

bpy.data.scenes["Scene"].render.filepath = "/Users/***/Blender/mkv/"

Blender tries to create the file with the directory name (I actually thought that Blender added automatically the filename with the start and end frames...). I changed it to:

bpy.data.scenes["Scene"].render.filepath = "/Users/***/Blender/mkv/" + str(n_strip) + ".mkv"

inside the loop and it now works perfectly.

Kudos to batFINGER for the hint.

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