need help converting to mp4

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need help converting to mp4

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pmb88

Newbie

14. June 2011 @ 02:04

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I have been using Any video converter(if you think that there is a better converter please advise) to convert some of the video files I downloaded to mp4. I am having a few questions of converting wmv files. It seems that all the wmv files involve VBR with video and or audio. I checked the file with mediainfo and pasted one result below.

Overall bit rate : 2 126 Kbps
Maximum Overall bit rate : 2 104 Kbps
Encoded date : UTC 2011-06-01 20:28:55.000

Video
ID : 1
Format : VC-1
Format profile : MP
Codec ID : WMV3
Codec ID/Info : Windows Media Video 9
Codec ID/Hint : WMV3
Description of the codec : Windows Media Video 9 - 2-pass VBR
Duration : 16mn 46s
Bit rate : 2 048 Kbps
Width : 960 pixels
Height : 540 pixels
Display aspect ratio : 16:9
Frame rate : 29.970 fps
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.132
Stream size : 246 MiB (96%)

Audio
ID : 2
Format : WMA
Format version : Version 2
Codec ID : 161
Codec ID/Info : Windows Media Audio
Description of the codec : Windows Media Audio 9 - 44 kHz, stereo VBR
Duration : 16mn 46s
Bit rate : 41.2 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Bit depth : 16 bits
Stream size : 4.94 MiB (2%)

Is there a way to convert vbr to cbr or is it best to keep it at vbr but in different format? What does it mean that vbr is Q85 or Q90? I am a newbie to this so I do not know much about various bit rate formats. I have been usually setting the video and audio bitrates to the ones I found in the original properties of the file. I became somewhat worried cause in some of the wmv files it said that audio bit rate was 0 kbps. I wanted clarification on what to do if the file that is being converted from uses VBR instead of CBR.

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seagrave

Member

17. June 2011 @ 12:41

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I believe VBR is inherent in doing a multipass encode. The first pass looks at where the bits can be best distributed. It makes for more efficient coding. I've used the free Handbrake for mp4 encoding in the past and I'm experimenting with mp4 again using Nero Recode and and old version of Handbrake (still has xvid) on a difficult video file. HB offer more options and the results so far have been better at the same bitrate. Hope this helps.

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