Reads the release from ffmpeg -version: ffmpeg version 9.0.2, ffmpeg version n7.1.1-22-g… (BtbN), or
ffmpeg version 4.2.7-0ubuntu0.1. A development build (ffmpeg version N-117541-g…) names no release, so its
libavformat version is mapped instead. null when neither is there.
Reads the release from
ffmpeg -version:ffmpeg version 9.0.2,ffmpeg version n7.1.1-22-g…(BtbN), orffmpeg version 4.2.7-0ubuntu0.1. A development build (ffmpeg version N-117541-g…) names no release, so its libavformat version is mapped instead.nullwhen neither is there.