Trouble converting VBR Vorbis to MP3

I have a VBR Vorbis file that I demuxed from an MKV. The trouble is it won't sync with the converted video.

MediaInfo:

Code:

Audio
Format                           : Vorbis
Codec ID                         : A_VORBIS
Duration                         : 29mn 19s
Bit rate mode                    : Variable
Channel(s)                       : 2 channels
Sampling rate                    : 48.0 KHz

Trying to convert it to (VBR or CBR) mp3. Any tips?

 

AVIDeMux should get it done. AFAIK it reads Vorbis and can use LAME for output.

 

it's probably caused by different timeline.

 

Do not erase the vorbis unless you can't hear the difference between them and the mp3s. You lose quality in the conversion. Convert to a VRB mp3. I would use LAME or Helix mp3 encoders. The variable formats have the best quality per size but do not convert well because most of the data is thrown away. That matters when you convert back to a wave for editing or transcoding. Maybe by transcoding to another variable format you might not take such a hit. You may or may not be able to actually hear the loss especally if the vorbis files are high bit rate. Eventually, players will play vorbis.

I have always used dbPowerAmp Converter. I do a great deal of conversions so I don't mind paying 25 USD/year for a high end package. I have never found an error with anything it has done.

 

Change it to CBR. VBR audio can lead to A/V synch problems with some encoders and formats.

 

Yes, Teddy you may be right. I forgot that the original problem was a sync problem not a quality problem.

Even going to CBR may not help. That data is gone. When changing a VBR to a CBR, the encoder just packs your audio with junk to fill in the holes. There is no guarentee that the time line will be correct just because there is extra garbage in it. That is one of the biggest issues with variable formats.

Let us all know if it worked or not.

 

This could all be solved really easily, without the debate over quality if someone could just point me in the direction of a good free MKV to AVI converter that actually works.

I tried your suggestions about converting to a CBR mp3 file and trying again, but to no avail. I still have audio issues.

In case any one's wondering let me get the whole MKV MediaInfo:

Code:

General
Format                           : Matroska
File size                        : 250 MiB
Duration                         : 29mn 5s
Overall bit rate                 : 1 199 Kbps
Encoded date                     : UTC 2007-04-24 17:26:57
Writing application              : mkvmerge v2.0.2 ('You're My Flame') built on Feb 21 2007 23:40:55
Writing library                  : libebml v0.7.7 + libmatroska v0.8.1
Cover                            : Yes / Yes

Video
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : High@L5.1
Format settings, CABAC           : Yes
Format settings, ReFrames        : 2 frames
Muxing mode                      : Container profile=Unknown@5.1
Codec ID                         : V_MPEG4/ISO/AVC
Duration                         : 29mn 4s
Nominal bit rate                 : 1 364 Kbps
Width                            : 640 pixels
Height                           : 480 pixels
Display aspect ratio             : 4/3
Frame rate                       : 29.970 fps
Resolution                       : 24 bits
Colorimetry                      : 4:2:0
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.148
Writing library                  : x264 core 46 svn-504
Encoding settings                : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex 
/ subme=5 / brdo=0 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0
 / chroma_qp_offset=0 / slices=1 / nr=0 / decimate=1 / bframes=2 / b_pyramid=0 / b_adapt=1 /
 b_bias=0 / direct=2 / wpredb=1 / bime=0 / keyint=250 / keyint_min=25 / scenecut=40 / rc=2pass /
 bitrate=1364 / ratetol=1.0 / rceq='blurCplx^(1-qComp)' / qcomp=0.60 / qpmin=10 / qpmax=51 /
 qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30
Language                         : Japanese

Audio
Format                           : Vorbis
Codec ID                         : A_VORBIS
Duration                         : 29mn 5s
Bit rate mode                    : Variable
Channel(s)                       : 2 channels
Sampling rate                    : 48.0 KHz
Language                         : Japanese

Text
Format                           : ASS
Codec ID                         : S_TEXT/ASS
Codec ID/Info                    : Advanced Sub Station Alpha
Title                            : ass
Language                         : English

 

Super might do the trick.

There was no debate over quality. I just didn't read your original very carefully.

Your problems may have arisen from your choice to demux to a vbr. VBRs are great space savers but are the worst possible choice for a transcode source.

 

All I did was use MKVExtractGui to extract. It was muxed as VBR Vorbis.

 

Well that is no surprise. What do you expect from a free ap? I have had little good results with Super. Still, it is free. You hate like hell to buy real software for a one time deal. Sorry I can't help.

 

Have you tried opening it in Virtualdub using the directshow input plugin ?

 

If it's conversion you want, try AVIDeMux. It also has a filter that can delay or advance the audio. That would work if your audio stays the same amount out of synch.

 

I would use AVIDemux, but the video file has B-Frames, whatever that means, and AviDemux can't convert it.

 

I just tried SUPER and it still gives me audio sync problems. The farther I get into the video the more the sound doesn't match.