Pentax cameras with 48,000 sample-rate audio in video mode?

BrianStanding · 03-09-2018, 09:58 AM

I know the K-3, K-3II and K-1 use a 48,000 sample rate for their audio. (Instead of the 32,000 used by the K-01 and K-5)

Do any other Pentax offerings use the higher sample rate?

**Digitalis** · 03-09-2018, 11:55 PM

If you want Higher bitrates from your camera audio, you are better off getting an external recorder from Tascam, Zoom or Roland. The audio recording features on DSLRs leave a lot to be desired when high bitrates and XLR inputs are needed.

BrianStanding · 03-12-2018, 11:20 AM

Originally posted by Digitalis

If you want Higher bitrates from your camera audio, you are better off getting an external recorder from Tascam, Zoom or Roland. The audio recording features on DSLRs leave a lot to be desired when high bitrates and XLR inputs are needed.

Thanks for the reply.

I already have a Zoom H2 recorder that I use for audio, that works great. The Zoom records at sample rates of 44,100, 48,000 or 96,000.

The issue is with trying to sync that audio with video coming from a Pentax camera. If the Zoom is at 48,000 and the audio from the Pentax video is at 32,000, then the sync drifts over time in a video nonlinear editor.

As I said, I know the K-3 uses 48,000 audio sampling, but I'm trying to find out if any other Pentax cameras do as well.

photoptimist · 03-12-2018, 12:53 PM

Originally posted by BrianStanding

Thanks for the reply.

I already have a Zoom H2 recorder that I use for audio, that works great. The Zoom records at sample rates of 44,100, 48,000 or 96,000.

The issue is with trying to sync that audio with video coming from a Pentax camera. If the Zoom is at 48,000 and the audio from the Pentax video is at 32,000, then the sync drifts over time in a video nonlinear editor.

As I said, I know the K-3 uses 48,000 audio sampling, but I'm trying to find out if any other Pentax cameras do as well.

Are you sure that matching the sample rates would fix the drift? I'd think that the problem stems from having two different clocks each with their own idiosyncrasies and thermal drift rate.

**Digitalis** · 03-12-2018, 03:10 PM

Using a clapper board - or something similar might do the trick. When I was doing video shoots with RED cameras, we were using a digital slate to sync up audio with video. And if needed, the RED cameras and audio recorders had clocks that could sync up together with femtosecond precision*. Expecting that from a DSLR is a bit much.

Originally posted by photoptimist

I'd think that the problem stems from having two different clocks each with their own idiosyncrasies and thermal drift rate.

This is pretty much it: if one clock is out of whack, it will skew the timing of the whole project.

* This was done through a BNC connection which is pretty standard in the high end video-audio realm. DSLRs even relatively video centric cameras lack this.

BrianStanding · 03-12-2018, 08:11 PM

I've worked with unsynced (no timecode, no HDMI jam-sync) audio and video from two separate recorders in the past. Yes, it drifts out of sync, but much less so if all the audio is in the same sample rate. If they're all the same sample rate, you can find a sync point (clapboard, or some other visual/audio cue), sync them once, and not have to worry about it again for 30 minutes or more. If they're differing sample rates, even if you resample the audio, they drift out of sync within less than a minute. It's a nightmare.

No answers, though, to my question? I can't find anything in the specs for the K-S2, K-70, K-P to indicate the audio sample rate one way or another.

03-09-2018, 09:58 AM	#1
BrianStanding Junior Member Join Date: Dec 2009 Location: Madison, WI Photos: Albums Posts: 36	Pentax cameras with 48,000 sample-rate audio in video mode? I know the K-3, K-3II and K-1 use a 48,000 sample rate for their audio. (Instead of the 32,000 used by the K-01 and K-5) Do any other Pentax offerings use the higher sample rate?

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03-09-2018, 11:55 PM	#2
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	If you want Higher bitrates from your camera audio, you are better off getting an external recorder from Tascam, Zoom or Roland. The audio recording features on DSLRs leave a lot to be desired when high bitrates and XLR inputs are needed.

03-12-2018, 11:20 AM	#3
BrianStanding Junior Member Join Date: Dec 2009 Location: Madison, WI Photos: Albums Posts: 36 Original Poster	Originally posted by Digitalis If you want Higher bitrates from your camera audio, you are better off getting an external recorder from Tascam, Zoom or Roland. The audio recording features on DSLRs leave a lot to be desired when high bitrates and XLR inputs are needed. Thanks for the reply. I already have a Zoom H2 recorder that I use for audio, that works great. The Zoom records at sample rates of 44,100, 48,000 or 96,000. The issue is with trying to sync that audio with video coming from a Pentax camera. If the Zoom is at 48,000 and the audio from the Pentax video is at 32,000, then the sync drifts over time in a video nonlinear editor. As I said, I know the K-3 uses 48,000 audio sampling, but I'm trying to find out if any other Pentax cameras do as well.

03-12-2018, 12:53 PM	#4
photoptimist Pentaxian Join Date: Jul 2016 Photos: Albums Posts: 5,126	Originally posted by BrianStanding Thanks for the reply. I already have a Zoom H2 recorder that I use for audio, that works great. The Zoom records at sample rates of 44,100, 48,000 or 96,000. The issue is with trying to sync that audio with video coming from a Pentax camera. If the Zoom is at 48,000 and the audio from the Pentax video is at 32,000, then the sync drifts over time in a video nonlinear editor. As I said, I know the K-3 uses 48,000 audio sampling, but I'm trying to find out if any other Pentax cameras do as well. Are you sure that matching the sample rates would fix the drift? I'd think that the problem stems from having two different clocks each with their own idiosyncrasies and thermal drift rate.

03-12-2018, 03:10 PM	#5
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	Using a clapper board - or something similar might do the trick. When I was doing video shoots with RED cameras, we were using a digital slate to sync up audio with video. And if needed, the RED cameras and audio recorders had clocks that could sync up together with femtosecond precision. Expecting that from a DSLR is a bit much. Originally posted by photoptimist I'd think that the problem stems from having two different clocks each with their own idiosyncrasies and thermal drift rate. This is pretty much it: if one clock is out of whack, it will skew the timing of the whole project. This was done through a BNC connection which is pretty standard in the high end video-audio realm. DSLRs even relatively video centric cameras lack this.

03-12-2018, 08:11 PM	#6
BrianStanding Junior Member Join Date: Dec 2009 Location: Madison, WI Photos: Albums Posts: 36 Original Poster	I've worked with unsynced (no timecode, no HDMI jam-sync) audio and video from two separate recorders in the past. Yes, it drifts out of sync, but much less so if all the audio is in the same sample rate. If they're all the same sample rate, you can find a sync point (clapboard, or some other visual/audio cue), sync them once, and not have to worry about it again for 30 minutes or more. If they're differing sample rates, even if you resample the audio, they drift out of sync within less than a minute. It's a nightmare. No answers, though, to my question? I can't find anything in the specs for the K-S2, K-70, K-P to indicate the audio sample rate one way or another.