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Trouble converting VBR Vorbis to MP3
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Ryutso
Junior Member
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3. May 2009 @ 09:51 |
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I have a VBR Vorbis file that I demuxed from an MKV. The trouble is it won't sync with the converted video.
MediaInfo:
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?
This message has been edited since posting. Last time this message was edited on 3. May 2009 @ 09:57
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olyteddy
Senior Member
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3. May 2009 @ 23:14 |
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mholix
Newbie
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4. May 2009 @ 02:00 |
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it's probably caused by different timeline.
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Mez
AfterDawn Addict
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15. May 2009 @ 06:41 |
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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.
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olyteddy
Senior Member
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16. May 2009 @ 01:38 |
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Change it to CBR. VBR audio can lead to A/V synch problems with some encoders and formats.
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Mez
AfterDawn Addict
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16. May 2009 @ 08:42 |
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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.
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Ryutso
Junior Member
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16. May 2009 @ 09:31 |
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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:
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
This message has been edited since posting. Last time this message was edited on 16. May 2009 @ 09:34
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Mez
AfterDawn Addict
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18. May 2009 @ 07:29 |
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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.
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Ryutso
Junior Member
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18. May 2009 @ 13:01 |
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Originally posted by Mez:
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.
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Mez
AfterDawn Addict
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18. May 2009 @ 13:07 |
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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.
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Senior Member
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18. May 2009 @ 13:27 |
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olyteddy
Senior Member
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18. May 2009 @ 22:04 |
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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.
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Ryutso
Junior Member
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18. May 2009 @ 22:51 |
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Originally posted by olyteddy:
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.
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Ryutso
Junior Member
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21. May 2009 @ 22:09 |
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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.
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