In many user-generated logs, convert020002 might be shorthand for:

The system identifies the source file (sone385). It "demuxes" the file, separating the raw video stream from the audio and existing subtitle tracks. 2. The Transcoding Engine (convert020002)

During the convert020002 step, the system has 1 minute to:

If you want, provide the file or a link and I can give a more specific technical review (format, bitrate, subtitle encoding, and visible issues).