avi data rate too high?

[hello2000]

Hi all,

I had a mkv video file that's 2 hours long. I have converted this mkv file to avi using xvid-mpeg-4 codec at a bitrate of 1360. The output file size is 1.2gb which is fine.

However, when i right clicked on the avi file and clicked on properties then details it shows a data rate of 1340kbps and total bitrate of 1500kbps.

I wanted to ask is this normal or should the data rate/total bitrate be significantly lower because I have another video which is avi (xvid mpeg-4 encoded) which is around 1hr and 50mins and has a data rate in the hundreds.

Thanks for reading

[aedipuss]

you can do the math if you want. filesize = bitrate x time(in seconds)

[redwudz]

Try dropping it into MediaInfo, might be more accurate. If it has variable bitrate audio or video, there may be a high, low and average bitrate, depending on the encoding method.

Or you may be reading the combined video and audio bitrates. The Videohelp Bitrate Calculator shows this with your information:



Your audio bitrate may be different and that can cause the difference in the calculated filesize, as can VBR audio.

And welcome to our forums.

[jman98]

I'm guessing that your audio is at 160 Kbps, so 1340 + 160 = 1500. If the data rate of the other file is in the hundreds, the quality is probably not very good unless they reduced the resolution by a lot.

[Bonie81]

Hi all,

I had a mkv video file that's 2 hours long. I have converted this mkv file to avi using xvid-mpeg-4 codec at a bitrate of 1360. The output file size is 1.2gb which is fine.

I am not really sure, but something is goofy here...
xvid-mpeg-4 codec at a bitrate of 1360. The output file size is 1.2gb
What is the audio container and audio specs??? I guess it is 160kbps (2 channel stereo)

Using NiC's mini bitrate Calc for
2 Hr 29.97 fps video with 160 (2 channel) Audio for Rip size : 2 CDs ( 1.4 GB approx) gives Ave. 1460 kpbs.
Here, you are getting 1500kbps which is quite normal.
Have You configured XViD or DiVX properly???

Bit rate 1460~1500 is low, but. fair enough if video bears good watchable quality.
I would consider any video with bit rate => 8800 kbps with 640 AC3 (5.1 or 7.1) or 8000kbps with 1540 DTS (5.1 or 7.1), a really high bit-rate Very RICH video.

"...I have another video which is avi (xvid mpeg-4 encoded) which is around 1hr and 50mins and has a data rate in the hundreds..."
- This may be because it might have very rich audio considering same size 1.2GB.

Keep in mind AVI container max audio plus video bitrate should not exceed 9600 or 9800kbps.
Practically you may be able to encode at higher bit rates than 9800kbps, but most of the player will fail to play it.

[hello2000]

Hi all, thanks for everyone's contribution to this thread.

I have recoded the mkv video file using VirtualDubMod by feeding the video through avisynth DirectShowSource using the same encoder and bitrate. The audio bitrate remain the same (160kbps, Lame MP3). The output was the same size.

Funny thing is that this time when I right click the video file and looked for the total bitrate it was in the hundreds which is kind of weird.

As a reply to "Bonie81" all i did was choose Advance Simple @ L5 for the xvid codec and entered the recommended bitrate from the xvid calculator. I haven't change the other settings as I don't know how to use them.