Free online 264 to MP4 converter

A CCTV recorder, camera, or hardware encoder may save video as a raw .264 stream that ordinary players and editors cannot handle reliably. Converting it to .mp4 adds a standard container, making the recording easier to play, edit, share, and archive.

What the 264 format is

In the Video category, .264 usually identifies a raw H.264/AVC elementary stream rather than a complete container. CCTV and DVR/NVR systems, IP cameras, hardware encoders, screen-recording tools, and FFmpeg-based applications commonly produce it.

A raw stream generally contains compressed video frames but no standard container metadata, index, duration, or reliable timestamps. It often has no audio because the recorder stores audio separately or does not record it. The extension does not guarantee that every file uses the same H.264 profile, frame rate, pixel format, or recorder-specific structure.

What the MP4 format is

.mp4 is a multimedia container based on MPEG-4 Part 14. It can store H.264 video, AAC audio, timestamps, duration, indexes, subtitles, and metadata in one file. Phones, televisions, browsers, media players, and video editors widely support it.

MP4 is a container, not a video codec. If the source is standard H.264, the video can often be placed in an MP4 container without re-encoding. This process, called remuxing, is faster and preserves the source image quality, but it does not improve a recording that was already compressed.

How to convert 264 to MP4

Using FFmpeg without re-encoding

Install FFmpeg, open a terminal in the folder containing the file, and run:

ffmpeg -f h264 -framerate 30 -i input.264 -c:v copy -an output.mp4

Replace 30 with the frame rate configured on the camera or recorder. The -f h264 option treats the input as a raw H.264 stream, while -c:v copy copies the video into the MP4 container without another compression pass. The -an option creates a video-only file.

If the recording has a separate AAC audio file, it can be muxed with the video:

ffmpeg -f h264 -framerate 30 -i input.264 -i audio.aac -c:v copy -c:a copy -shortest output.mp4

Check the audio format and synchronization first. A raw video stream does not contain enough timing information to guarantee synchronization when the frame rate is unknown or incorrect.

Re-encoding for compatibility

Remuxing may fail when the stream is malformed, uses an unusual H.264 profile or pixel format, or comes from a recorder that does not produce a standard elementary stream. Re-encode it with:

ffmpeg -f h264 -framerate 30 -i input.264 -c:v libx264 -crf 23 -preset medium -pix_fmt yuv420p -movflags +faststart output.mp4

Use a lower CRF value for higher quality and a larger file; 18 is high quality, 23 is a common balance, and 28 produces a smaller file with more visible compression. Re-encoding takes longer and cannot restore detail lost in the original recording. The yuv420p pixel format improves compatibility with consumer devices, while +faststart moves MP4 metadata to the beginning for progressive playback.

Using 101convert.com

You can convert the file on 101convert.com for free without installing software. Upload the .264 file, choose MP4 if prompted, start the conversion, and download the result. Enter the frame rate recorded by the source device if the converter requests it.

Quality and compatibility limits

• Remuxing does not change the video. It only places the existing H.264 stream in an MP4 container.
• An incorrect frame rate can cause incorrect playback speed, duration, or audio synchronization. Raw H.264 files often do not store the frame rate themselves.
• For broad compatibility, H.264 video with yuv420p and AAC audio is safer than unusual H.264 profiles, pixel formats, or audio codecs.
• Some CCTV systems use proprietary headers, segmented files, encryption, damaged frames, or a nonstandard stream despite the .264 extension. The manufacturer’s export utility may be required before FFmpeg or a converter can process the file.
• MP4 conversion does not remove camera overlays, recover missing frames, decrypt protected footage, or add audio that was never recorded.