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The keyframes are not enumerated to frame.

Commented on another question of yours that there is no necessity that the keyframes fall exactly on integer values. Feel some of this answer could be there or vice versa

For the 2D keyframe point coordinate vector x is the frame, and y is the value y . Both are floats.

Eg a simple fcurve may have points (1, 30), (33, 23.0), (222.3, 0) having a frame range of 1 to 222.3 but an enumeration of 0, 1, 2.

To crop based on the frame of the keyframe point

import bpy

def crop_animation(action, frame_start, frame_end):
    """ Crop the given action keyframes by removing all keyframes before 
    frame_start and after frame_end
    """
    fcurves = action.fcurves
    for fcu in fcurves:
        for kf in fcu.keyframe_points:
            if kf.co.x < frame_start or kf.co.x > frame_end:
                fcu.keyframe_points.remove(kf)

# test call                
crop_animation(bpy.data.actions[0], 10000, 0)

Not sure how you get the keyframe not in fcurve error using code in question. .

Keyframe delete.

keyframe_delete is the opposite to keyframe_insert. An fcurve holds our keyframes, it is not itself keyframed.

For example if a location keyframe is added to context object on current frame then

>>> C.object.keyframe_insert('location')
True

>>> C.object.keyframe_delete('location')
True

removes it. Or in the case of bones

C.object.pose.bones["Foo"].keyframe_delete("location", frame=frame)

Make an amended copy of the action.

Have added a related link below re copying and cropping fcurves. To make your fcurve such that the kf's fall on integer frames would make a copy, then over it's integer range. For example if fc is our original, then the points of our new curve could be

[(frame, fc.evaluate(frame) for frame in range(frame_start, frame_end)] 

For bvh animation as displayed in other question with constant spacing between keyframes Another option is to scale the animation such that between frame distance is 1.

Related.

How to change an FCurve value in Python

Copying specific frames from one action to another ( python )

Python. How to find a point on the timeline where Fcurve reaches a certain value without changing current subframe?

The keyframes are not enumerated to frame.

Commented on another question of yours that there is no necessity that the keyframes fall exactly on integer values. Feel some of this answer could be there or vice versa

For the 2D keyframe point coordinate vector x is the frame, and y is the value y . Both are floats.

Eg a simple fcurve may have points (1, 30), (33, 23.0), (222.3, 0) having a frame range of 1 to 222.3 but an enumeration of 0, 1, 2.

To crop based on the frame of the keyframe point

import bpy

def crop_animation(action, frame_start, frame_end):
    """ Crop the given action keyframes by removing all keyframes before 
    frame_start and after frame_end
    """
    fcurves = action.fcurves
    for fcu in fcurves:
        for kf in reversed(fcu.keyframe_points.values()):
            if kf.co.x < frame_start or kf.co.x > frame_end:
                fcu.keyframe_points.remove(kf)

# test call                
crop_animation(bpy.data.actions[0], 10000, 0)

Not sure how you get the keyframe not in fcurve error using code in question. .

Keyframe delete.

keyframe_delete is the opposite to keyframe_insert. An fcurve holds our keyframes, it is not itself keyframed.

For example if a location keyframe is added to context object on current frame then

>>> C.object.keyframe_insert('location')
True

>>> C.object.keyframe_delete('location')
True

removes it. Or in the case of bones

C.object.pose.bones["Foo"].keyframe_delete("location", frame=frame)

Make an amended copy of the action.

Have added a related link below re copying and cropping fcurves. To make your fcurve such that the kf's fall on integer frames would make a copy, then over it's integer range. For example if fc is our original, then the points of our new curve could be

[(frame, fc.evaluate(frame) for frame in range(frame_start, frame_end)] 

For bvh animation as displayed in other question with constant spacing between keyframes Another option is to scale the animation such that between frame distance is 1.

Related.

How to change an FCurve value in Python

Copying specific frames from one action to another ( python )

Python. How to find a point on the timeline where Fcurve reaches a certain value without changing current subframe?

The keyframes are not enumerated to frame.

Commented on another question of yours that there is no necessity that the keyframes fall exactly on integer values. Feel some of this answer could be there or vice versa

For the 2D keyframe point coordinate vector x is the frame, and y is the value y . Both are floats.

Eg a simple fcurve may have points (1, 30), (33, 23.0), (222.3, 0) having a frame range of 1 to 222.3 but an enumeration of 0, 1, 2.

To crop based on the frame of the keyframe point

import bpy

def crop_animation(action, frame_start, frame_end):
    """ Crop the given action keyframes by removing all keyframes before 
    frame_start and after frame_end
    """
    fcurves = action.fcurves
    for fcu in fcurves:
        for kf in fcu.keyframe_points:
            if kf.co.x < frame_start or kf.co.x > frame_end:
                fcu.keyframe_points.remove(kf)

# test call                
crop_animation(bpy.data.actions[0], 10000, 0)

Not sure how you get the keyframe not in fcurve error using code in question. .

Keyframe delete.

keyframe_delete is the opposite to keyframe_insert. An fcurve holds our keyframes, it is not itself keyframed.

For example if a location keyframe is added to context object on current frame then

>>> C.object.keyframe_delete('location')
True

removes it. Or in the case of bones

C.object.pose.bones["Foo"].keyframe_delete("location", frame=frame)

Make an amended copy of the action.

Have added a related link below re copying and cropping fcurves. To make your fcurve such that the kf's fall on integer frames would make a copy, then over it's integer range. For example if fc is our original, then the points of our new curve could be

[(frame, fc.evaluate(frame) for frame in range(frame_start, frame_end)] 

For bvh animation as displayed in other question with constant spacing between keyframes Another option is to scale the animation such that between frame distance is 1.

Related.

How to change an FCurve value in Python

Copying specific frames from one action to another ( python )

Python. How to find a point on the timeline where Fcurve reaches a certain value without changing current subframe?

The keyframes are not enumerated to frame.

Commented on another question of yours that there is no necessity that the keyframes fall exactly on integer values. Feel some of this answer could be there or vice versa

For the 2D keyframe point coordinate vector x is the frame, and y is the value y . Both are floats.

Eg a simple fcurve may have points (1, 30), (33, 23.0), (222.3, 0) having a frame range of 1 to 222.3 but an enumeration of 0, 1, 2.

To crop based on the frame of the keyframe point

import bpy

def crop_animation(action, frame_start, frame_end):
    """ Crop the given action keyframes by removing all keyframes before 
    frame_start and after frame_end
    """
    fcurves = action.fcurves
    for fcu in fcurves:
        for kf in fcu.keyframe_points:
            if kf.co.x < frame_start or kf.co.x > frame_end:
                fcu.keyframe_points.remove(kf)

# test call                
crop_animation(bpy.data.actions[0], 10000, 0)

Not sure how you get the keyframe not in fcurve error using code in question. .

Keyframe delete.

keyframe_delete is the opposite to keyframe_insert. An fcurve holds our keyframes, it is not itself keyframed.

For example if a location keyframe is added to context object on current frame then

>>> C.object.keyframe_insert('location')
True

>>> C.object.keyframe_delete('location')
True

removes it. Or in the case of bones

C.object.pose.bones["Foo"].keyframe_delete("location", frame=frame)

Make an amended copy of the action.

Have added a related link below re copying and cropping fcurves. To make your fcurve such that the kf's fall on integer frames would make a copy, then over it's integer range. For example if fc is our original, then the points of our new curve could be

[(frame, fc.evaluate(frame) for frame in range(frame_start, frame_end)] 

For bvh animation as displayed in other question with constant spacing between keyframes Another option is to scale the animation such that between frame distance is 1.

Related.

How to change an FCurve value in Python

Copying specific frames from one action to another ( python )

Python. How to find a point on the timeline where Fcurve reaches a certain value without changing current subframe?

The keyframes are not enumerated to frame.

Commented on another question of yours that there is no necessity that the keyframes are in frame order. Feel some of this answer could be there or vice versa

For the 2D keyframe point coordinate vector x is the frame, and y is the value y . Both are floats. The frame does not necessarily have to be exactly on a keyframe. For example may be from an imported bvh animation with a differing frame rate.

To crop based on the frame of the keyframe point

import bpy

def crop_animation(action, frame_start, frame_end):
    """ Crop the given action keyframes by removing all keyframes before 
    frame_start and after frame_end
    """
    fcurves = action.fcurves
    for fcu in fcurves:
        for kf in fcu.keyframe_points:
            if kf.co.x < frame_start or kf.co.x > frame_end:
                fcu.keyframe_points.remove(kf)

# test call                
crop_animation(bpy.data.actions[0], 10000, 0)

Not sure how you get the keyframe not in fcurve error using code in question. .

Copy it.

Have added a related link below re copying and cropping fcurves. To make your fcurve such that the kf's fall on integer frames would make a copy, then over it's integer range. For example if fc is our original, then the points of our new curve could be

[(frame, fc.evaluate(frame) for frame in range(frame_start, frame_end)] 

For bvh animation as displayed in other question with constant spacing between keyframes Another option is to scale the animation such that between frame distance is 1.

Related.

How to change an FCurve value in Python

Copying specific frames from one action to another ( python )

Python. How to find a point on the timeline where Fcurve reaches a certain value without changing current subframe?

The keyframes are not enumerated to frame.

Commented on another question of yours that there is no necessity that the keyframes fall exactly on integer values. Feel some of this answer could be there or vice versa

For the 2D keyframe point coordinate vector x is the frame, and y is the value y . Both are floats.

Eg a simple fcurve may have points (1, 30), (33, 23.0), (222.3, 0) having a frame range of 1 to 222.3 but an enumeration of 0, 1, 2.

To crop based on the frame of the keyframe point

import bpy

def crop_animation(action, frame_start, frame_end):
    """ Crop the given action keyframes by removing all keyframes before 
    frame_start and after frame_end
    """
    fcurves = action.fcurves
    for fcu in fcurves:
        for kf in fcu.keyframe_points:
            if kf.co.x < frame_start or kf.co.x > frame_end:
                fcu.keyframe_points.remove(kf)

# test call                
crop_animation(bpy.data.actions[0], 10000, 0)

Not sure how you get the keyframe not in fcurve error using code in question. .

Keyframe delete.

keyframe_delete is the opposite to keyframe_insert. An fcurve holds our keyframes, it is not itself keyframed.

For example if a location keyframe is added to context object on current frame then

>>> C.object.keyframe_delete('location')
True

removes it. Or in the case of bones

C.object.pose.bones["Foo"].keyframe_delete("location", frame=frame)

Make an amended copy of the action.

Have added a related link below re copying and cropping fcurves. To make your fcurve such that the kf's fall on integer frames would make a copy, then over it's integer range. For example if fc is our original, then the points of our new curve could be

[(frame, fc.evaluate(frame) for frame in range(frame_start, frame_end)] 

For bvh animation as displayed in other question with constant spacing between keyframes Another option is to scale the animation such that between frame distance is 1.

Related.

How to change an FCurve value in Python

Copying specific frames from one action to another ( python )

Python. How to find a point on the timeline where Fcurve reaches a certain value without changing current subframe?