Free online H264 to 264 converter

Programs used for surveillance, broadcast testing, or video analysis sometimes require a raw H.264 stream with the .264 extension instead of .h264. Because both extensions usually identify the same H.264 elementary video stream, conversion often requires only renaming the file rather than re-encoding it.

What the H264 format is

.h264 commonly identifies a raw video elementary stream encoded with the H.264/AVC codec. Security cameras, DVR systems, screen recorders, FFmpeg, and encoders based on x264 can create this format. Unlike MP4 or MKV, a raw H.264 file normally contains no general-purpose container metadata, subtitle track, or separate audio stream.

The extension is not a complete format specification: some devices use .h264 for proprietary output or store unusual timestamp and parameter-set data. A file that merely has an .h264 name may therefore need inspection before processing.

What the 264 format is

.264 generally denotes the same kind of raw H.264/AVC elementary stream. It is used by surveillance software, codec test tools, broadcast workflows, and video applications that identify raw AVC input by the shorter extension.

Its main advantage is compatibility with software that specifically looks for .264. Changing from .h264 to .264 does not reduce the file size, add audio, create a container, or improve playback; both names can refer to identical bytes.

How to actually convert H264 to 264

Rename the file when only the extension is required

1. Make a backup of the original file.
2. Rename camera.h264 to camera.264. On Windows, enable File Explorer → View → Show → File name extensions first so you do not create camera.264.h264.
3. Open the renamed file in the target application. If it rejects the file, the application may require a container such as MP4 or a different H.264 stream structure.

Copy the stream with FFmpeg

FFmpeg can read the input as a raw H.264 stream and write the same encoded video without re-encoding:

ffmpeg -f h264 -i input.h264 -c:v copy -f h264 output.264

The -c:v copy option preserves the encoded frames, so processing is fast and introduces no generational quality loss. The output may not be byte-for-byte identical because FFmpeg can rewrite stream framing, but the video remains H.264 encoded.

To check whether the source is actually raw H.264, use:

ffprobe input.h264

For a no-installation option, the 101convert.com website can convert the file for free; upload the source, choose .264 if offered, and download the result. Avoid uploading footage containing sensitive surveillance or personal information.

Quality, compatibility, and limitations

Renaming or stream-copying does not change resolution, frame rate, bitrate, profile, level, or image quality. It also does not repair a damaged stream or add missing SPS/PPS parameter sets, which some players need to decode the video.

Raw .264 files often lack reliable duration and seeking information because they have no container index. If the target program needs audio, timestamps, thumbnails, or dependable seeking, convert to a container instead, for example:

ffmpeg -f h264 -i input.h264 -c:v copy output.mp4

Some camera files use proprietary framing even though they contain H.264 video. If FFmpeg reports invalid NAL units or the target software still refuses the renamed file, the source may require the camera manufacturer's exporter rather than a simple extension change.