Converting MP4 Files with 119.88 fps to 29.97 fps using FFmpeg (Fix without resampling)

Converting MP4 Files from 119.88 fps to 29.97 fps using FFmpeg (Fix without Resampling)

In the world of video editing, it's quite common to encounter situations where you need to convert the frame rate of your video files. One such scenario is when you have several MP4 files with a frame rate of 119.88 fps, and you want to convert them to 29.97 fps without resampling. In this article, we will guide you through the process using the popular FFmpeg tool.

What is FFmpeg?

FFmpeg is a free and open-source software project that produces libraries and programs for handling multimedia data. It includes libavcodec, an audio/video codec library used by several other programs, including VLC media player and MPlayer.

Why Convert Frame Rate without Resampling?

Resampling is a process where the frame rate is changed by interpolating or deleting frames. This can lead to a loss of video quality. When you need to maintain the original quality of your video, it's best to convert the frame rate without resampling.

How to Convert Frame Rate without Resampling using FFmpeg

To convert the frame rate of your MP4 files without resampling, you can use the following FFmpeg command:

Here's a breakdown of the command:

• -i input.mp4: This specifies the input file.
• -filter:v "fps=fps=29.97": This sets the video filter to change the frame rate to 29.97 fps.
• -c:v libx264: This specifies the video codec to be used (the H.264 codec in this case).
• -crf 23: This sets the Constant Rate Factor (CRF) for the H.264 codec. A lower value means higher quality but larger file size.
• output.mp4: This specifies the output file.

Please note that this command will not work if the input file has a variable frame rate. In such cases, you will need to convert the variable frame rate to a constant frame rate before changing it to 29.97 fps.

Subtitles

If your MP4 files have subtitles, you can use the following command to include them in the output file:

The -c:s copy option tells FFmpeg to copy the subtitles without re-encoding them.

FFmpeg is a powerful tool for handling multimedia data, including converting the frame rate of MP4 files. By using the correct command, you can convert the frame rate of your MP4 files from 119.88 fps to 29.97 fps without resampling, thus maintaining the original quality of your videos.

References

• FFmpeg Official Website
• Changing Frame Rate with FFmpeg
• FFmpeg on Wikipedia