ExposureRoom - News - What sizes of Video will I get

What sizes of Video will I get	3votes
Posted by: Peg Futrell	Views: 889 Favorited: 0 Comments: 16

July 30, 2008 12:27 PM	Filed Under: FAQ Tags: Help, Video Sizes

The Reasons for 3 Versions

There are three versions of video that ExposureRoom creates, in this order:

Low
For "low" bandwidth, and/or older computers. This is the first size you will see minutes after uploading your video.
Medium
For viewers whose bandwidth does not accommodate "high" bandwidth. This is also the default size when one goes to the page to view the asset.
HD
High Definition. This version can be played on new machines with high bandwidth in real time.

ExposureRoom specializes in HD Video. If you upload a true HD video, you can rest assured that we will transcode your video to be the best quality you will see on the internet today.

Many viewers, however, do not have the bandwidth or the hardware required to play HD video. So we produce two other sizes to accommodate these viewers. In this way, your video achieves a wider audience than it would if we just produced the one HD version.

For viewers who have a newer computer but do not have high bandwidth, they can still view the HD version. To do this, one can click "play", and then "pause", wait for the video to buffer completely, and then "play" once again after it has downloaded completely.

Perceived Quality

The perceived quality is the same for all versions. In order to achieve the same perceived quality, we reduce the dimensions of the video, allowing people with older machines or lower bandwidth to watch. Viewers don't see any change in quality between the various versions. The medium version, our default, will play on older machines without stutter, and still be the best quality on the internet.

Width Thresholds

There are three "thresholds" as they pertain to the Width of your video:

336 pixels in width
640 pixels in width
1280 pixels in width

Let's discuss what these three thresholds means, starting with the largest number.

1280: Any video that has a width of 1280 or above will have an HD version created. In addition, any video with a width greater than the previous threshold, that is, greater than "640" pixels, will have an HD version produced. It may not be "true" HD quality, for which you need a video with a width of 1280 or larger.

640: Any video with a width greater than 336 pixels will have a medium-sized video produced. If the video's width is not as wide as 640 pixels, the "medium" version will not be 640 but will be the actual width of the video.

336: You will ALWAYS have a small video produced, regardless of width of the original.

Comments

Free video hosting

August 25, 2008 07:56 AM

well waht is the limit actually about the file size which we can upload in mbs and what is the bandwidth allowed.

Peg Futrell

August 25, 2008 10:31 AM

There is no limit to either size or bandwidth.

Justin McAnn

October 03, 2008 07:14 PM

Size vs Bitrate

Besides changing the size do you also adjust the bitrate? Do you know what the settings are?

I understand that a smaller movie in dimensions makes it a smaller file however if I encode a 336 file using the same 3000kbps I used on a 640 someone on a slower connection would still have a hard time watching it, right?

Peg Futrell

October 03, 2008 08:25 PM

Hi Justin,

Thanks for asking about the different sizes of videos on ExposureRoom.

The reason we offer different sizes is to accommodate different connection speeds. Smaller sizes don't require the same settings as the larger sizes, therefore they are easier to download and watch for people with slower connections or older machines.

steven siegel

November 07, 2008 06:55 PM

question about file sizes

A 3 minute HD video in .avi will be about 15 GB, obviously too large to upload to XR. I can compress it to less than 100 MB. Easy to play but big loss in quality. Various codecs will give sizes in between. What is a good compromise in file size to upload for the "average" XR viewer?

Peg Futrell

November 07, 2008 07:05 PM

Hi Steven,

We suggest keeping the file under or up to a gig, if possible.

steven siegel

November 07, 2008 07:17 PM

question about file size

Thanks for the answer, Peg. But won't a 1GB file take hours to upload?

Peg Futrell

November 12, 2008 11:01 AM

Hi Steven,

If your internet connection is high-speed, then it should not take a prohibitively long period of time. Many members have uploaded files that large.

salvatore dipasquale

December 14, 2008 06:15 PM

problem with file size and video quality

Hi
I've some problem concerning compression.. I use sony vegas 8 pro and I usally post videos compressed with this setting:
mainconcept avc, 1280*720, 25 fps, p.a.r. 1.000, max bitrate 3.400.000 and average 3.000.000; audio 44100 at 192 kbs.
Anyway, although the size of mp4 file is about 400 mb, the MD size is 69.3 mb and the HD size is 47 mb...
How can be it possible? why the HD size is lower than MD size? The HD streaming version, anyway, ain't good and it's rich of compression artefacts...
help, please!

Peg Futrell

December 14, 2008 07:20 PM

Hi Salvatore,

Thanks for your question. Let me address a few of your points.

First of all, if a video contains alot of movement, with pans and tilts, etc., it is very possible for the MD version to be larger in filesize than the HD version. This has to do with alot of factors, but it is possible especially with fast moving videos. We could increase the bit rate on our end, but then people would not have the processing power to view it. It is doubtful that most people would be able to download and then view the original version either with a higher bit rate, for the same reason, lack of processing power.

Also, I noticed that the audio bit rate is set to 192 kbs. Most audio files are not that high. Was it recorded at 192 kbs? If it was not, you want to lower your audio bit rate when you encode the video.

I went to check to see the video, but I cannot see it. If you deleted it, can you upload it again so that we can view this video? Thanks!

salvatore dipasquale

December 15, 2008 06:56 PM

Hi Peg
Thanks for your answer. You can't see my video because it's a private asset password protected, waiting to finish the editing process and to solve the problem of compression artefact
you can see it here: http://exposureroom.com/skizos_ver3
pw: zerobudget
please note that it's a not definitive version
audio is set on 192 because the original master includes only wav files at 44100. anyway, I don't understand if increasing bitrate at 8000 will improve quality...or worst, the server has to apply a new recompression to set it at 3500 and so video quality is lower...
PLEASE POST ME YOUR IMPRESSION CONCERNING VIDEO QUALITY
thanks!

Peg Futrell

December 15, 2008 07:39 PM

Hi Salvatore,

I checked out the video. Of the 12 minutes, I saw artifacts twice, in the exact same place on the left white wall in the hallway as the actor went to the front door. It's only in this same physical location. Until I consult with our technicians, I can't tell you why this place on the white wall would yield artifacts.

Other than that, the quality is very high. Please note that increasing the bit rate of the original is not going to "solve" or remove these artifacts. Let me see what our technicians say about this.

salvatore dipasquale

December 16, 2008 06:18 AM

Hi Peg
thanks for answer
I' ve noticed artefact also in the initial sequence of movie, on the left and centre of exterior wall.
Anyway, I'll wait the response of technicians to solve the problem
Thanks!

Peg Futrell

December 16, 2008 10:09 AM

Salvatore,

According to our technicians, in the encoding of videos for internet viewing, such artifacts can appear on white or similarly pale colored areas. To raise the quality high enough to eliminate these types of artifacts would make the video not-viewable by many due to lack of adequate processing power. I'm sorry I could not have provided you a ready solution to this.