image-to-video endpoint hangs when using webhook

[briandrew4857]

The image-to-video endpoint works correctly without the use of a webhook. However, after adding a webhook, the process hangs at the following log:

INFO:services.image_to_video:Running FFmpeg command: ffmpeg -framerate 24 -loop 1 -i

Steps to Reproduce
Call the image-to-video endpoint without a webhook.
Result: It completes successfully.
Add a webhook to the request.
Result: The process hangs and never completes, stopping at the FFmpeg log.

[stephengpope]

can you provide the entire payload, any media URLs and the build, https response, etc?