Blender-in-Docker “Factory-Startup” one-liner that procedurally creates a scene (plane textured with a phone-screen video, sun light, animated camera with Bézier easing), then headlessly renders the result to an H.264 MP4—no pre-existing .blend required. Ideal as a reproducible, copy-paste gist for anyone needing quick 3-D perspective moves on v…

docker-blender-all-in-one.sh

docker run --rm -i -v "$PWD":/w linuxserver/blender:4.4.3 \
  blender --factory-startup -b --python - <<'PY'
import bpy, math, os
vid = "/w/phone_screen.mp4"                 # <<< your vertical video
assert os.path.exists(vid), "Video missing"

# ------------------------------------------------------ build objects
bpy.ops.mesh.primitive_plane_add(size=2)
plane = bpy.context.object

mat              = bpy.data.materials.new("PhoneVidMat")
mat.use_nodes    = True
nodes, links     = mat.node_tree.nodes, mat.node_tree.links
bsdf             = nodes["Principled BSDF"]
tex              = nodes.new("ShaderNodeTexImage")
tex.image        = bpy.data.images.load(vid)
tex.image.source = 'MOVIE'                  # <-- key line
tex.image_user.use_auto_refresh = True      # update each frame
links.new(tex.outputs["Color"], bsdf.inputs["Base Color"])
plane.data.materials.append(mat)

# ------------------------------------------------------ camera + light
cam_data = bpy.data.cameras.new("Cam")
cam      = bpy.data.objects.new("Cam", cam_data)
bpy.context.collection.objects.link(cam)
cam.location, cam.rotation_euler = (0, -4, 2), (math.radians(70),0,0)
bpy.context.scene.camera = cam
bpy.ops.object.light_add(type='SUN', location=(0,-2,4))

# ------------------------------------------------------ quick pan anim
for f in range(0,240):
    bpy.context.scene.frame_set(f)
    cam.location.x = math.sin(f*0.02)*0.5
    cam.keyframe_insert("location", index=0)
for fc in cam.animation_data.action.fcurves:
    for kp in fc.keyframe_points:
        kp.interpolation, kp.easing = 'BEZIER', 'EASE_IN_OUT'

# ------------------------------------------------------ render
sc = bpy.context.scene
sc.frame_start, sc.frame_end = 0, 239
sc.render.image_settings.file_format = 'FFMPEG'
sc.render.ffmpeg.codec  = 'H264'
sc.render.ffmpeg.format = 'MPEG4'
sc.render.filepath = "/w/out.mp4"
bpy.ops.render.render(animation=True)
PY