To remove variable frame rate (VFR) from a phone video before using it in OBS Studio, export or transcode it to a chosen constant frame rate (CFR). With FFmpeg, use its CFR output mode or the fps filter: both adjust the frame schedule by duplicating or dropping frames. Renaming the file or remuxing it into a different container is not the same conversion.
Not every phone video is VFR, and the available guidance does not establish that every OBS workflow requires CFR. Check the clip and your project first; if you do convert, verify the exported file and its audio before using it.
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What VFR means—and what conversion changes
Frame rate describes when video frames are displayed. Apple’s QuickTime format documentation describes its variable-frame-rate indication in terms of whether video sample display durations vary; it does not establish that any particular phone or clip is VFR. Apple’s QuickTime format documentation
A CFR export puts frames on a selected, regular schedule. This is a timing conversion, not just a metadata change: FFmpeg documents that CFR mode duplicates or drops frames to reach the requested rate. The fps filter does the same kind of conversion to a specified constant rate. Consequently, the converted file will not necessarily preserve every source frame unchanged. FFmpeg documentation · FFmpeg filters documentation
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Before converting, check the source and choose a target
Inspect the actual clip
Check the video properties or frame timing for the file you intend to use. Do not infer its timing mode from the phone model alone. The precise inspection steps depend on your operating system and the software you choose; no particular inspection app or file has been tested here.
Match the output rate to your project
Choose a target frame rate that makes sense for both the source footage and the OBS project. There is no universal rate to prescribe without knowing those details. If you select a different rate, the conversion may need to duplicate or drop frames to create its regular schedule.
Convert to CFR with FFmpeg
FFmpeg is a command-line option with documented CFR support. Its current online documentation describes -fps_mode cfr as duplicating or dropping frames to achieve the requested constant frame rate; the fps filter converts to a specified constant rate in a similar way. See the output option documentation and the filter documentation for the current syntax and details.
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There is no universally safe one-line command for an unspecified clip and project. Before constructing a command, decide on the target rate, output container and video codec, audio handling, and stream mapping. Those choices depend on your file and compatibility needs. The command must use an explicit CFR output mode or frame-rate conversion filter; changing only the filename or container does not schedule frames at a constant rate.
Use a graphical converter if you prefer
A GUI video converter can be simpler if its export settings explicitly let you choose a constant frame rate. Select a target that suits your source and OBS project, then export and verify the result. The available evidence establishes FFmpeg’s CFR behavior, not a feature comparison among GUI products, so check the chosen app’s settings and documentation rather than assuming that a generic “convert” or “MP4” option makes the output CFR. Paid software is a convenience choice, not a requirement established here.
Verify the export, then add it to OBS
- Check the exported file’s properties. Confirm that the frame-rate mode is reported as constant, if your inspection tool provides that information. Exact labels vary by software.
- Watch or scrub through the whole clip with audio. Look for visible judder, unexpected duration changes, or audio synchronization problems before relying on the converted file.
- Use the converted file in your OBS workflow. If the only issue is that another application needs a different container, consider remuxing as a separate compatibility step.
OBS’s Remux Recordings feature is documented as converting a recording to a more compatible container such as MP4. That is a container task; the OBS guide does not describe remuxing as CFR frame scheduling. If you specifically need CFR, use a frame-rate conversion or export operation. OBS Standard Recording Output Guide
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Common mistakes and troubleshooting
- The file is MP4, but it still appears VFR: MP4 is a container choice, not proof of a constant frame schedule. Export again with an explicit CFR setting or FFmpeg CFR mode.
- You changed the extension or remuxed the file: Neither action by itself performs the documented CFR scheduling conversion. Use a CFR-capable transcode or export instead.
- The converted video looks uneven: CFR conversion can duplicate or drop frames. Recheck that the chosen target suits the source and project; inspect the result before using it.
- Audio is out of sync or duration changed: Check the full export, including audio, and revisit the conversion’s stream mapping and audio handling. Those choices depend on the input and output; there is no single setting established for every file.
- You are unsure whether conversion is needed: Inspect the source and confirm what your particular OBS workflow requires. The available guidance does not establish that every phone clip is VFR or that every OBS installation rejects it.
- Someone suggests changing CBR: Constant bitrate and constant frame rate describe different properties. A bitrate setting is not a substitute for CFR conversion.
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