The whole process will most likely be a quick one. It does partly depend on your video file size. An advice, regardless of what program you use to restore videos, is to add one file at a time and attempt to repair your damaged files in the same way. If we are to take into account what the developer of Wondershare Repairit Portable says, this application will succeed where others have failed.

Repairs multiple corrupt or not playing videos in one go,
Supports popular formats including MOV, MP4, M4V, MKV, etc.
Supports preview of repaired video files before saving them,
Ensures high success rate with powerful repair technology.
Wondershare Repairit is one of the best video repair software worldwide for repairing video files in different formats like MOV, MP4, M4V, M2TS, MKV, MTS, 3GP, AVI and FLV.

Being a fully-functional video repair tool, Repairit ensures instant and effective repair irrespective of the videos corrupted while shooting, recording, transferring, editing, converting, or processing.

Use Wondershare Repairit to fix broken/unplayable videos recorded from videos shot with all leading camera brands such as Canon, Nikon, Sony, GoPro, DJI,etc. or mobile phone.

Exclusive Features
Enhanced Advanced Repair
This advanced feature allows you adding a sample to repair severely damaged videos with a higher success rate. Moreover, sample file verification helps select a suitable sample.

Full Preview of Repaired Videos
There is no limitation of only 30s' preview of the repaired videos. For videos in AVI, FLV, MTS, M2TS and MKV formats, you can preview the entire video at ease.

Remarkable and Friendly Modern UI
Repairit has a modern UI that displays all the technical information (frame rate, video duration, format) along with a dedicated video thumbnail.

Repairs Multiple Videos in Batch
This powerful tool can fix multiple videos at the same time, even if they have the same or different formats.

Previews Video Captures During Playing
Go through the quick snippets captured from different keyframes of the repaired video to ensure that the overall video quality is intact.

Repairs Full HD & 4K Videos
With Repairit, you can even fix Full HD, 4K, and 8K videos recorded from different cameras or smartphone brands.

Incredible High Success Rate
With strong underlying technologies, Wondershare Repairit has a comparatively higher success rate than other similar software.