If you have a raw video file and a subtitle file that goes wrong exactly at 1 hour, 58 minutes, 56 seconds, follow this professional repair guide.

To convert a video:

ffmpeg -i input.mp4 -c:v libx264 -crf 18 -c:a aac output.mp4

Adjust the codecs, quality settings, and output file name as needed.

This guide provides a general approach. For more specific instructions, more details about the file and the exact tasks you need to accomplish would be necessary.