If a video player shows Infinity:NaN:NaN, first check the media element’s duration and currentTime. The values may be non-finite because no media data is ready yet or the media’s end time is unknown. You can guard a custom time display against those values, but hiding the text does not fix missing duration information or establish why Firefox is reporting it.
What Infinity:NaN:NaN means
The string is usually a time formatter displaying values it cannot turn into a normal timestamp. In the HTML media API, HTMLMediaElement.duration is measured in seconds. It is NaN when no media data is available and positive Infinity when the media resource is not known to have a bounded duration, such as a live stream without an announced end. The HTML Standard defines these values; MDN documents the property.
duration is read-only, so assigning a replacement value to it is not the way to remove the display. If an unbounded stream ends, the standard says its duration can change to the time of its final frame or sample, and the browser fires durationchange.
Check whether the browser or your page draws the text
The 2017 SitePoint post described the value appearing in Firefox video controls after a recording, but did not establish whether the display came from native browser controls or custom page code. It also did not include a usable recording, Firefox version, or operating system. See the original SitePoint discussion.
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| Where the text appears | What to check |
|---|---|
| Custom time display made by your page | Inspect the formatter and the values it receives. Guard against non-finite values before formatting. |
| Browser-native controls | Inspect the media element’s values and source transition. Page code can avoid feeding bad values to its own formatter, but cannot directly rewrite the native control’s display. |
Inspect the live-stream-to-recording transition
In the SitePoint example, the page first assigns a live camera and microphone stream to video.srcObject, then creates a MediaRecorder. When recording data arrives, the script clears srcObject, assigns a Blob URL to video.src, creates a video/webm Blob for upload, and adds the controls attribute when the stop button is clicked. These are distinct media phases: a live stream may have no known end, while the recorded Blob is expected to be finite.
Log the element’s values during the transition, including after metadata loads and when duration changes:
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const video = document.querySelector("video");
function logMediaState(label) {
console.log(label, {
duration: video.duration,
currentTime: video.currentTime,
readyState: video.readyState,
error: video.error
});
}
video.addEventListener("loadedmetadata", () => logMediaState("loadedmetadata"));
video.addEventListener("durationchange", () => logMediaState("durationchange"));
video.addEventListener("ended", () => logMediaState("ended"));
logMediaState("initial");Also log immediately before and after replacing srcObject with the Blob URL. This shows whether the non-finite values belong to the live stream, the new recording, or a point before metadata is available.
Prevent a custom formatter from displaying invalid times
When the page owns the time display, only format values that are finite. For an unknown duration, show a deliberate label such as “Live” or “Duration unavailable” instead of passing the value into a timestamp formatter.
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function formatTime(seconds) {
if (!Number.isFinite(seconds) || seconds < 0) {
return "Duration unavailable";
}
const wholeSeconds = Math.floor(seconds);
const minutes = Math.floor(wholeSeconds / 60);
const remainder = wholeSeconds % 60;
return `${String(minutes).padStart(2, "0")}:${String(remainder).padStart(2, "0")}`;
}
function updateTimeDisplay(video, element) {
element.textContent = Number.isFinite(video.currentTime)
? formatTime(video.currentTime)
: "Time unavailable";
}Choose the fallback text to match your interface: a live player can say “Live,” while a recording that has not loaded metadata can say “Loading.” The example prevents a custom formatter from turning non-finite input into a malformed time; it does not repair the media or change native controls.
If the recorded WebM still reports Infinity
Test the exact recorded Blob as a standalone source after metadata has loaded. Record its MIME type, Firefox build, and the resulting duration and currentTime values; compare the same file in another current browser if available. If Firefox continues to report Infinity for a finite recording, duration or index metadata in the WebM is one area to investigate.
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Mozilla documented historical cases of MediaRecorder-created WebM files reporting Infinity. Bug 1385699 was marked fixed for Firefox 57, while Bug 1601061 reported the behavior in Firefox 69, 70, and 71 and remains unconfirmed in its record. These reports show that related behavior has occurred; they do not identify the cause of the SitePoint poster’s symptom or establish current Firefox behavior.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the original thread establishes
The SitePoint discussion dates to November 16, 2017. Its author reported that Firefox alone showed Infinity:NaN:NaN in place of an elapsed-time value, but supplied no reproducible recording or exact browser and operating-system versions. The reply did not confirm a cause or a working fix. It linked to a separate 2016 Firefox 44.0.2 report involving a YouTube add-on and a NaN:NaN control display; that different setup is not proof of the cause here. The available evidence therefore supports checking the media values and source transition, not attributing the symptom to one confirmed Firefox bug.
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