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Can't extract audio from MKVs
Posted: Fri Jul 08, 2011 12:39 pm
by kirkmc
've used MakeMKV to rip a blu-ray disk to a bunch of MKV files. All the files play perfectly.
I want to rip the audio, and tried using VLC's Streaming/Exporting Wizard. This works fine for short tracks - less than a few minutes long - but for anything longer (I've tried both 30-min and 2-hour tracks) I just get noise, no matter what settings I use. Also, in some cases, choosing WAV results in a huge file, many GB, whereas it should be about 600 MB per hour.
Can anyone help? Is this a problem with the files created by MakeMKV? Given that some files from a disk work, and others don't, I don't know, but I can't figure out what might be wrong.
Re: Can't extract audio from MKVs
Posted: Fri Jul 08, 2011 8:38 pm
by Smithcraft
Well, you could use a mkv demuxing tool that would split the various tracks. The audio would be a mka file.
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Re: Can't extract audio from MKVs
Posted: Fri Jul 08, 2011 8:40 pm
by kirkmc
Smithcraft wrote:Well, you could use a mkv demuxing tool that would split the various tracks. The audio would be a mka file.
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What type of program would do that? And what do I then do with an mka file?
Re: Can't extract audio from MKVs
Posted: Fri Jul 08, 2011 10:38 pm
by Romansh
kirkmc wrote:Also, in some cases, choosing WAV results in a huge file, many GB, whereas it should be about 600 MB per hour.
WAV is basically PCM (uncompressed audio). 2-channel Stereo @ 48 kHz with 16-bit samples is about 659 MiB per hour. But 5.1 @ 48 kHz is about 1.93 GiB (16-bit samples) or 2.90 GiB (24-bit samples) per hour.
Re: Can't extract audio from MKVs
Posted: Fri Jul 08, 2011 10:59 pm
by kirkmc
Romansh wrote:kirkmc wrote:Also, in some cases, choosing WAV results in a huge file, many GB, whereas it should be about 600 MB per hour.
WAV is basically PCM (uncompressed audio). 2-channel Stereo @ 48 kHz with 16-bit samples is about 659 MiB per hour. But 5.1 @ 48 kHz is about 1.93 GiB (16-bit samples) or 2.90 GiB (24-bit samples) per hour.
I only ripped the 2 channel audio.
Re: Can't extract audio from MKVs
Posted: Fri Jun 29, 2012 6:57 pm
by lesdiabolique
Every time I rip a movie to MKV, the audio becomes two channel even though I have checked the 3/2+1 box. Furthermore, the sound is more a mono track than a stereo one.
Why won't it transfer the original audio?
My mate says that he has had no problem with this. Is it because I'm putting it onto a disc? The video is brilliant so what gives?
Confused of Wilts
Please tell if anyone knows the answer!
Re: Can't extract audio from MKVs
Posted: Sat Jun 30, 2012 4:00 am
by Smithcraft
If you post your complete work flow we might be able to help you.
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