Fundamentally (ignoring ffmpeg incantations), I think there are four options: 1. re-encode the whole thing 2. re-encode just the first GOP 3. start a bit ear

Fundamentally (ignoring ffmpeg incantations), I think there are four options: 1. re-encode the whole thing 2. re-encode just the first GOP 3. start a bit early or late 4. include the full first GOP but use an edit list to instruct the player to skip to the timestamp of interest