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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Use FFprobe to screen a video’s frame-rate metadata, then inspect frame or packet timestamps if the result is unclear or compatibility matters. A mismatch between FFprobe’s r_frame_rate and avg_frame_rate is a reason to investigate—not proof by itself that a file is variable frame rate (VFR). The decisive question is whether frame durations vary.
Check frame-rate metadata with FFprobe
FFprobe, included with FFmpeg, can report information about a media file’s streams. The FFmpeg Project describes it as gathering information from multimedia streams and printing it in human- and machine-readable form. For a quick screen, open a terminal where FFprobe is installed and run:
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ffprobe -v error -select_streams v:0 -show_entries stream=r_frame_rate,avg_frame_rate -of default=noprint_wrappers=1 input.mp4Replace input.mp4 with your file’s path. The command selects the first video stream and prints its r_frame_rate and avg_frame_rate values. FFprobe’s options and output formats are documented in the FFprobe documentation.
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Interpret the two values as a screen
If the values differ, treat that as a warning to investigate. Comparing them is a useful quick check, but it is a heuristic: the fields alone do not conclusively classify every file. Equal values are not universal proof of constant frame rate (CFR), either. The official FFprobe documentation explains how to report stream information; it does not promise that comparing these two fields classifies all formats.
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Confirm by inspecting frame or packet timing
When the summary fields are ambiguous—or you need a more confident answer—inspect timing across the file. FFprobe can show frame and packet information; compare presentation timestamps or frame intervals throughout the video. If frame durations vary, the file has variable timing. If they remain constant, that supports a CFR conclusion. A nominal frame-rate label alone does not answer this question.
FFprobe’s -show_frames and -show_packets options expose frame and packet records. For example, to print frame records for the first video stream in a machine-readable form, use:
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ffprobe -v error -select_streams v:0 -show_frames -of compact input.mp4Review the presentation timestamps and timing fields across the file, rather than relying on one record or the reported average. For a large file, this produces extensive output; directing it to a file can make inspection easier, for example by adding > frames.txt in a shell. The exact fields available can depend on the format and stream.
Check for a QuickTime-specific VFR marker
For applicable QuickTime files, Apple documents a variable-frame-rate indication: an unsigned 32-bit value of 0 means the frame rate is constant, while 1 means frame durations vary. This is a format-specific field, not a universal marker. Do not assume it exists in every QuickTime file or applies to other containers. See Apple’s QuickTime File Format documentation.
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Choose the inspection method that fits the decision
| Method | What it examines | Best use | Limit |
|---|---|---|---|
Compare r_frame_rate and avg_frame_rate |
Stream-level summary fields | Fast initial screen with FFprobe | A mismatch is a warning, not conclusive proof; equality is not a universal guarantee. |
| Inspect frame or packet timing | Individual frame or packet timestamps and intervals | Stronger confirmation when timing varies or the decision matters | Output can be lengthy, and available fields depend on the file and stream. |
| Read the QuickTime VFR indication | A format-specific marker | Applicable QuickTime files when the marker is available | The field’s meaning must not be generalized to other containers. |
Will VFR cause problems when streaming?
There is no universal acceptance rule established here: whether a VFR file is accepted or handled as intended depends on the destination platform and its current ingest requirements. A frame-rate label by itself cannot guarantee how a particular service will process a file. Check the current specifications for the platform you plan to use; do not assume VFR alone will cause rejection.
Or let it run in the cloud
Checking a file’s timing is a separate step from keeping a YouTube stream running. StreamNeo is a cloud service for looping uploaded videos on YouTube; it does not inspect or certify files as VFR or CFR. Upload a recording or build a playlist, add your YouTube stream key, and go live. Your computer and home connection do not need to stay on, and StreamNeo automatically recovers if YouTube drops the stream. The uploaded video streams as made, up to 4K 60fps, at one flat price per slot. The first day is free with no card. Learn more at StreamNeo; the first day is free, with a Monthly option at $9.99 per month.
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