iOS transcoded video duration discrepancy

[Redmage3555]

After transcoding a 60 second video, I see that the duration info for the transcoded output file is much greater than 60 seconds:

"sourceInfo": {
    "duration": 60.43333,
    "size": 3896249,
    "bitrate": 397518.2,
    "width": 426,
    "height": 240,
    "orientation": "landscape"
},
"transcodeInfo": {
    "duration": 4439.4,
    "size": 3915382,
    "bitrate": 401060.5,
    "width": 426,
    "height": 240,
    "orientation": "landscape"
},

Of course, the actual video file isn't 4439 seconds long - it's still the original 60 seconds. The issue only appears when using getVideoInfo().

Here's another example:

"sourceInfo": {
    "duration": 1.541667,
    "size": 12136752,
    "bitrate": 3001813,
    "width": 1280,
    "height": 720,
    "orientation": "landscape"
},
"transcodeInfo": {
    "duration": 2263.8,
    "size": 2053258,
    "bitrate": 417212.9,
    "width": 426,
    "height": 239,
    "orientation": "landscape"
},

There doesn't seem to be an obvious pattern involving the source duration vs transcode duration from the files I've tested with so far.

I see this duration issue to occur every time I transcode a video on iOS. Any thoughts as to what might be going wrong?

[jashick]

I am seeing the same thing. Sometimes the duration is correct, but certain videos (and I can't tell what it is about the video) causes the duration to be wrong. From what I see, it seems to be doubling the time and multiplying it by 10.. Example. I have a video that is 12 seconds long and the duration is showing 233.6 (The video is probably 11.68 seconds). (11.68 * 2 = 23.36 * 10 = 233.6);

[btafel]

Just ran into this issue. Sharing with you my workaround.....

var factor = 73.3964; //god knows why
console.log("duration", transcodeInfo.duration, (transcodeInfo.duration/factor));

[brianlittmann]

I think this issue is being caused by having a video that is trimmed down from a longer video. For instance, I had a 2.5 minute (150 seconds) video from which I trimmed and exported a 3 second clip via QuickTime. QuickTime correctly reports the trimmed clip as 3 seconds, but running it through VideoEditor.getVideoInfo reports the duration of the original source file: ~150 seconds.

This seems to only happen on the iOS platform. See VideoEditor.m for reference, and the timeRange attribute of AVAssetTrack.

[captaincole]

I'm seeing the same thing as @jashick and getting a wildly different factor than @btafel . This is definitely an issue as I'm trying to limit videos by duration.

The factor also varies on a video to video basis... so I don't think I can just implement a factor.

[facconi]

Hi everybody. The same is happening to me! Is there any known fix or solution? Thanks

[momomatteo]

I'm also having the same problem. Someone has found a workaround?

[brianlittmann]

@facconi @momomatteo This isn't super clean, but using straight JS gives an accurate duration:

@ViewChild('video') videoChild
video: any = {}

loadVideoMetadata() {
	// Load metadata for video and get duration with JS
	let videoEl = this.videoChild.nativeElement
	videoEl.src = this.video.filepath
	videoEl.load()

	// Time-out loading the metadata after 3 seconds in case anything went wrong
	let timeout = setTimeout(() => {
		clearInterval(interval)
		this.showError("Could not load the selected video.")
	}, 3000)

	// Keep checking until metadata has loaded
	let interval = setInterval(() => {
		if (videoEl.readyState > 0) {
			clearTimeout(timeout)
			clearInterval(interval)
			this.video.duration = videoEl.duration
		}
	}, 200)
}

[peter-holcomb-trifin]

Did anyone ever find a resolution to this? Getting the same weird behavior on ios

[stewones]

god knows why 🤣 , but dividing by 73.3964 seems to work. thanks @btafel