If your English subtitles are in an external .srt or .ass file, ensure they exactly match the framerate (e.g., 23.976 fps or 29.97 fps) of the video.

srt_to_clean_text('fjin046engsub.srt', 'fjin046engsub_clean.txt')

Before converting, inspect the original file using ffprobe (part of FFmpeg):

这是处理长视频（如电影）最关键的技巧。简单的整体偏移无法解决逐帧速率差异导致的。例如，一部2小时的电影，如果帧率不匹配，开头只差0.1秒，到了结尾可能差出5秒。

Use "Same as source" to prevent synchronization issues.

The search query "fjin046engsub convert020136 min better" pertains to technical processes for converting video files and integrating English subtitles for a 2-hour, 1-minute, and 36-second video. Key strategies for optimizing such files include using software like MKVToolNix for subtitle multiplexing and FFmpeg for transcoding to improve file quality and duration synchronization.

: Play the converted file side-by-side with the original, focusing heavily on subtitle readability and fast-moving scenes to ensure no blocking or blurring occurred.

Slower encoding speeds allow the software to utilize advanced algorithms for better compression. Same as Source