Calculator (convert): this form computes the average bitrate of a file based on the length of a video (or audio) file and the file size, in Kilobytes.
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Last Updated: Jan 30, 2005

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Length of video:
hours : minutes : seconds
: :
test: 407_ BackRelief.mpg


29:59
test: 402_ YogaGlow.mpg


29:59

test: JudgmentDay FallRituals-.mpg

21:29

File size, in kilobytes
enter total file size in KB: no spaces, no commas
(e.g. 1206544, not 1,206,544)
File Size:
806,620
KB
(787 MB)
File Size:
1,206,944 KB
(1179 MB)
File Size:
516,596
KB


onClick: do javascript function "showTotals"

     
Total Length of Video, in Seconds:
totalSeconds.value = secTotal
.
.
>

Video Stream Duration:
1797.40 sec

Calculated: 1799 seconds
OK
Number of Frames = 53944 ->

Video Stream Duration:
1798.13 sec

Calculated: 1799 seconds
OK
Number of Frames = 38645 ->

Video Stream Duration: 1288.17 sec

Calculated: 1289 seconds
OK
You indicated a file size of (KB)
totalKilobytes.value = bytetotal

this equals (after padding subtracted) (Kb).
totalKilobits.value = bittotal
     
Estimated padding stream size:
paddingEst.value = PaddingFixed + " KB";
Actual padding size:
52,504 KB

Calculated:
52,571
OK
Actual padding size:
52,731 KB
Actual padding & private sizes:
2557 + 30284 + 5034 =
37,875 KB

This means your file has an approximate bitrate of for the audio and video combined.

The encoding used for the audio part of your file makes this number vary widely. The "combined stream" value should only be used to compare files that you know have the same audio encoding applied (for example, comparing two video files with the same length, each with MP2 audio, or each with AC-3 audio.

If we assume only one video stream and one audio stream, and no subpictures,
and we assume a constant bitrate of 384 Kbps for audio,
your video stream has
an approximate average bitrate of
kpbs

If we assume a constant bitrate of 192 Kbps for AC-3 (Dolby Digital) audio, your video stream has
an approximate average bitrate of
kpbs

Total Average
Bitrate =
2931 Kbps
(2.8 Mbps)

 

 

 

Video Peak Bitrate (1 sec) = 4812 Kbps






Audio: MP2
bitrate =
384 Kbps

 

 

Actual Video Average Bitrate = 2931 Kbps

 

<
Calculated Total =
2969





off by:
-38 kbps
OK

Total Average
Bitrate =
4687 Kbps
(4.8 Mbps)

 

 

 

Video Peak Bitrate (1 sec) = 6926 Kbps






Audio: MP2
bitrate =
384 Kbps







Actual Video Average Bitrate = 4687 Kbps

 


<

Calculated Total =
4749





off by:
-62 kbps
OK

Average Bitrate =
2932 Kbps
(3.2 Mbps)









Video Peak Bitrate (1 sec) = 4492 Kbps






Audio: Doby Digital bitrate = 192 Kbps





Actual Video Average Bitrate =
2932 Kbps










<

Calculated Total =
2778

off by:
154 kbps

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