Sample rate

[Caritasfounder]

Hi,

Maybe these questions about sample rate are really simple, but here I go.

First, does 44.1 kHz work for Internet videos?

For other projects, maybe I want 48 kHz. Does every segment need to be 48 kHz for the final video to be 48 kHz?

Thanks.

[Alex H.]

Audio for digital video runs at a native 48kHz... that's what your camera records and what your NLE wants. Keep it at an uncompressed (WAV or AIFF) 48k throughout production and post-production, and don't convert until after output and only if needed.

Internet hosting sites like YouTube and Vimeo usually request the audio to be compressed to AAC 44.1kHz. That should be done at the compression-for-Internet stage, as it's always better to down-sample than to up-sample. For DVD, broadcast, theatrical screening, etc., the audio should stay at 48kHz.

[Caritasfounder]

One of my cameras maybe records at 11 kHz. Maybe I will use that one for video only and not sound, but have not been able to record without sound for some reason.

I have some music from Pond5 and RevoStock and some of it maybe is 44.1. I think much of Pond5 music is probably 44.1.

Thanks.

[Alex H.]

One of my cameras maybe records at 11 kHz. Maybe I will use that one for video only and not sound, but have not been able to record without sound for some reason.

?!

What camera are you using? I've never heard of a camera with 11kHz audio. 33kHz, yes (miniDV in 4-channel mode), but 11kHz is a new one on me.

I have some music from Pond5 and RevoStock and some of it maybe is 44.1. I think much of Pond5 music is probably 44.1.

Yes, most production music will be at 44.1k... the native resolution of CD audio. In that case, it must be up-sampled to 48kHz for editing with video.

[Caritasfounder]

It is a Memorex camera.

If I'm making a project for the Internet that will just be silent videos with music, and the music is 44.1, do I still need to change the music to 48 kHz if I am going to go back to 44.1 for the Internet?

[j1clark@ucsd.edu]

Hi,

Maybe these questions about sample rate are really simple, but here I go.

First, does 44.1 kHz work for Internet videos?

For other projects, maybe I want 48 kHz. Does every segment need to be 48 kHz for the final video to be 48 kHz?

Thanks.

44.1K or 48K are 'sample rates', that is how many samples are taken of the audio stream per second, with 2 popular bit depths, 16 and 24. When one is outputing the 'end product', there is concern about compression and bit rates involved, and compressed bit rates above 128 Kbs/s seems to be the minimum recommend that I've seen around.

I use 192 Kbs/s for most of my 'Internet' output.

I record 'film' audio at 48K, 24 bits. When I output for 'Internet', I select 192 Kbs/s for the 'compressed bit rate'.

Audio CD run at around a 1 Mbs/s rate... just to compare.

People who make professional products in audio may have a different set of specs for output.

[dre83]

if you're deleting the sound you recorded and just music...it doesn' matter in what sample rate it is...

44,1 48, 46, 47, 01, 04, 245434343453 , 12,4877678676

it really doesn't matter.

if you upload it to vimeo, youtube, it will even I think automatically compress and make it a "youtube alright" or "vimeo alrigh" video

[Alex H.]

It is a Memorex camera.

Model number? I'm still baffled by the 11kHz audio.

If I'm making a project for the Internet that will just be silent videos with music, and the music is 44.1, do I still need to change the music to 48 kHz if I am going to go back to 44.1 for the Internet?

In theory, yes. Video editing software is generally looking for 48kHz audio, but there are some exceptions. What are you using to edit?

If you aren't using any source audio, you simply delete the sound from the video footage when you edit.

[Caritasfounder]

Model number? I'm still baffled by the 11kHz audio.



In theory, yes. Video editing software is generally looking for 48kHz audio, but there are some exceptions. What are you using to edit?

If you aren't using any source audio, you simply delete the sound from the video footage when you edit.

I don't know the number for the camera. If I'm correct, it was given to me as a gift in 2009 and I had a hard time with it and didn't use it very much. I want to use it now for a particular project. I have the important cords for it but have not found the book that might have the number.

I use what is probably thought of as one of the worst things to use, but it works for my small projects. I use Windows Movie Maker. I don't know much maybe about other versions of it, but I think the version I have is probably one of the best that was released. It probably does prefer 48 kHz.

[Alex H.]

Windows Movie Maker, I believe, will take mixed sample rates and deal with them. Editing programs like that are designed for absolute consumer/amateur users and are made to handle whatever people throw at them from MP3s and CD audio to video from cheap cameras. It saves you the hassle of having to convert files to match, but in return it sacrifices a few pretty invaluable tools for editing (including meters for keeping an eye on sound levels).

Is it a Memorex MyVideo? SD or HD, or do you know? Flip-out screen, or does it hold and function like shooting with a cell phone?