Create a VOD clip from a live-to-VOD asset on Mux, including safely clipping while the source broadcast is still active

Steps

1. For instant, non-re-encoded clipping of a live-to-VOD or on-demand asset, apply playback modifier query parameters (or equivalent JWT claims for signed playback) to the playback URL specifying relative start/end times, which trims the HLS manifest on the fly without creating a new asset
2. For a durable, standalone clip asset, POST to the assets endpoint with an input object whose url is set to mux://assets/{asset_id}, referencing the source asset to clip from
3. Set start_time and end_time (in seconds, offset from the beginning of the source) on the clip's input object; start_time defaults to 0 and end_time defaults to the full duration of the source if omitted
4. When clipping from the active asset of a live stream that is still broadcasting, always provide an explicit end_time, since the source asset is still growing and an omitted end_time will default to the asset's duration at the moment of clip creation rather than a fixed point you intended
5. Poll or use webhooks to detect when the new clip asset finishes processing (ready state) before serving its playback ID to viewers
6. Decide whether to use instant playback-URL clipping (fast, no new asset, ideal for quick highlight sharing) or asset-based clipping (creates a durable, independently manageable VOD asset) based on whether you need the clip to persist and be managed separately from the source