Audio is as Important as Video

3.53.53.53.53.54votes
Posted by: Shiv Kumar
Views: 2697Favorited: 0 Favorite It Comments: 4
November 12, 2009 02:04 AM
Filed Under: New Feature
Tags: Audio Quality, Audio Settings
 
At ExposureRoom we believe Audio is as Important as Video. That is the audio in a video is important, and so we've made some feature enhancements to videos on ExposureRoom. This enhancement has actually been in place for a month. Like so many other enhacements this one went under the radar. But I've noticed many of you commenting on videos saying, "the audio is really good" and that reminded me of this feature.
 
I'm sure there are many people out there who simply can't watch a video if the audio of the video is bad. And conversely, if the audio is really good, it makes a video so much more interesting and enjoyable.
 
We found a lot of member's believe this since if you paid close attention to the audio in their videos, there are all sorts of sounds that you don't ever pickup when the video is transcoded for on-line purposes. Websites that host videos typically encode audio at about 96kbps. The really good ones encode video at 128kbps and ExposureRoom was amongst those.
 
But being "really good" wasn't quite good enough and so we've made some changes. We'll encode your videos at the same audio bit rate as your originals! Well, up to 320kbps.
 
The video below is a small snippet of one of the Editor’s choices. The audio starts out as 128kbps and somewhere along the way, it switches to 320kbps. I’ll leave it to the viewer to figure it out. If the audio system on your computer (or home theater) system is good, you’ll notice a marked difference. The Original by Studio-x can be found here Sp - kép maradsz. Yes, it is encoded with an audio bit rate of 320kbps since the original that was uploaded was encoded at an audio bit rate of 384kbps.
 

There are a few reasons for limiting the audio bit rate to 320kbps and they are the following:
  1. The spec limit of MP3 is 320kbps and since we've found that most source audio is MP3 we decided to use this limit. (The source audio is not typically encoded at 320kbps but they are MP3)
  2. We've done a number of tests and find that on consumer grade audio equipment it is virtually impossible to discern the different between 320kbps and say 384kbps, while the increase from 128kbps to 320 kbps is very audible.
  3. Increasing the audio bit rate a video is encoded at has the impact that the viewer's bandwidth requirement is that much more.
Due to #3 above, the Low versions will still be encoded at up to 128kbps, since the Low version is primarily for folks who have a slow Internet bandwidth. The medium and HD versions will be encoded with an audio bit rate of up to 320kbps. But please, be sure you know what you're doing when you set your audio bit rate at the time of encoding your videos. Be sure to read this article to understand more: Bit Rates De-Mystified
 
Please also note that audio bit rates are in "steps" meaning that if the audio in your video is not encoded at exactly 128kbps (for example) but is encoded at 124kbps it will be encoded at 112kbps. One step lower.
 
The following are some of the audio bit rate steps:
48kbps
64kbps
96kbps
112kbps
128kbps
192kbps
224kbps
256kbps
320kbps

Comments



Charles Frisby    November 12, 2009 11:39 AM

Excellent. Makes me want to pull up old videos projects, re-encode and re-upload!

theo rossi    November 14, 2009 12:21 AM

Oh yeah.

Well done.
Good info.

I never watch any video with bad audio.
I always record with the highest quality my Zoom-h2 allows.

Mark Weiss    June 13, 2010 02:21 AM

Audio is very important. But the biggest offender is usually a poor quality mic, miking technique, and camera audio system. That's why I like the new CineAlta line from Sony. The audio is DAT-quality and I find it opened a new market for me, recording recitals and classical quartets at rates these clients can afford, because I don't need a second audio recording system and the attendant work of synching separate audio to video. Audio is easily 70% of video. That's why 93% of my theater/screening room investment is in the audio system; the rest in a really good projector and screen. Audio leaves an impression, because it carries not only SFX and dialog, but the music soundtrack too. If that's done right, it will eclipse the picture in terms of importance of quality.

zhang yunlong    June 14, 2010 12:53 AM

nice!

i like it! very beautiful!



Leave A Comment

Data Entry Error
First Name:  Last Name: 
Title:
Comment: Required Information
  Required InformationIndicates Required Information

News

Privacy Policy | Terms Of Service | Contact Us | Support | Help/FAQ | News