Convert TEMP to MP4

A camera, screen recorder, browser download, or video editor may leave a .temp or .tmp file when recording or exporting is interrupted. Software that accepts only MP4 requires the file to contain a complete, readable video stream before it can be finalized or transcoded.

What the TEMP format is

TEMP is not a defined video format. Applications use temporary files for unfinished recordings, downloads, caches, previews, recovery data, and editing projects. A file named recording.temp might contain a complete video, a partially written container, raw media data, metadata, or unrelated working data.

Common sources include screen recorders, webcam programs, browsers, download managers, video editors, and interrupted camera transfers. Some recording applications write a temporary file first and add the final index and metadata only when recording stops normally.

Keep the original unchanged and work on a copy. Check the file size, creation time, and source folder, then inspect the copy with MediaInfo or FFprobe:

ffprobe -hide_banner recording.temp

If FFprobe shows video or audio streams, the file may be recoverable or convertible. If it reports no streams, the file is not directly convertible as a video; use the program that created it to look for a recovery, finalize, or project-opening function.

What the MP4 format is

MP4 is a multimedia container, not a single codec. The most broadly compatible combination is H.264 video with AAC audio, although MP4 can also contain other codecs.

H.264/AAC MP4 files are accepted by most phones, browsers, televisions, media players, editors, and sharing platforms. They generally provide smaller files than lightly compressed or uncompressed recording formats. Changing .temp to .mp4 changes only the filename; it does not create an MP4 container or repair missing data.

How to recover or convert the file

Use the program that created it first

For an unfinished recording, reopen the original application and locate its recovery or project folder. Use its equivalent of File → Recover, File → Open, Finalize recording, or Repair, then export the recovered media through File → Export → MP4 or Export → Video. This method can restore indexes and metadata that a general converter cannot reconstruct.

Do not close or terminate a recorder that is still actively writing the file. Stop the recording normally when possible, because some programs create the usable MP4 only during the stop and finalization process.

Convert a readable video with FFmpeg

FFmpeg is the most flexible desktop option when the temporary file contains recognizable streams. Install it from the official FFmpeg website or a trusted operating-system package manager, then run:

ffmpeg -i recording.temp -map 0:v:0 -map 0:a? -c:v libx264 -preset medium -crf 20 -c:a aac -b:a 160k -pix_fmt yuv420p -movflags +faststart output.mp4

This re-encodes the video as H.264 and the audio as AAC. A CRF value of 18–23 is common: lower values preserve more quality and produce larger files. The yuv420p pixel format improves compatibility with older devices.

If inspection confirms that the source already contains compatible H.264 video and AAC audio, remux it without re-encoding:

ffmpeg -i recording.temp -map 0 -c copy -movflags +faststart output.mp4

Stream copying is fast and preserves the original quality, but it cannot fix incompatible codecs, broken timestamps, missing indexes, or truncated input. Errors such as moov atom not found, missing trailer, or invalid data often indicate an incomplete recording rather than an incorrect extension.

Use a desktop graphical converter

VLC can convert a valid temporary video: choose Media → Convert/Save, add the copy, select Convert/Save, choose an H.264/AAC MP4 profile if available, set an output name ending in .mp4, and start the process. VLC is suitable for ordinary readable input but cannot reliably recover a recording whose final container metadata was never written.

HandBrake is another desktop option for a file that it can open. Select an MP4 preset such as Fast 1080p30, choose H.264 video and AAC audio where available, set the destination to output.mp4, and start the encode. It is not a repair tool and may reject arbitrary temporary files.

Use an online converter only for non-sensitive files

CloudConvert and Convertio can convert a temporary file if their servers recognize it as a supported video. Upload a copy, not the original, and use this option only for material that may safely leave the computer. Services can impose file-size, duration, or account limits, and they cannot recreate frames that were never saved. FFmpeg or a desktop converter is preferable for private, copyrighted, or very large recordings.

Quality and compatibility limits

Test the resulting MP4 from beginning to end, including audio synchronization, seeking, and the final seconds, before deleting the temporary source. A temporary file may be truncated, contain only a preview, use proprietary encryption, or lack essential metadata; no converter can recover unwritten or encrypted content without the originating application.

If the file plays but seeking fails, remuxing with FFmpeg may rebuild the MP4 index:

ffmpeg -i recording.temp -map 0 -c copy -movflags +faststart output.mp4

The +faststart option places MP4 metadata near the beginning of the file for faster web playback. Re-encoding can reduce compatibility problems, but every lossy encode can reduce image or sound quality; retain the original whenever it is recoverable.