| Value | Meaning |
|---|---|
| AVFMT_DURATION_FROM_PTS | < Duration accurately estimated from PTSes |
| AVFMT_DURATION_FROM_STREAM | < Duration estimated from a stream with a known duration |
| AVFMT_DURATION_FROM_BITRATE | < Duration estimated from bitrate (less accurate) |
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The duration of a video can be estimated through various ways, and this enum can be used to know how the duration was estimated.