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Old 30th June 2010, 12:32   #1  |  Link
bubbleboy11
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How can I convert a TRUEHD stream in a .mkv file to .ac3?

Hi,

I have a .mkv file with a TRUEHD audio stream. I want to convert the audio to .ac3. Is there a program that will do this automatically?

If not, I have managed to extract the audio and make a separate .ac3 file. How do I insert this into the now audioless .h64 file and rebuild the .mkv file and make sure it syncs up?

thanks!

BB
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Old 1st July 2010, 12:37   #2  |  Link
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Quote:
"Also, FFmpeg now has floating point PCM support and supports MLP/TrueHD decoding."
Code:
ffmpeg.exe -i your.mkv -vn audiostream.ac3
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Old 1st July 2010, 17:47   #3  |  Link
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Quote:
Originally Posted by bubbleboy11 View Post
Hi,
If not, I have managed to extract the audio and make a separate .ac3 file. How do I insert this into the now audioless .h64 file and rebuild the .mkv file and make sure it syncs up?
If you have extracted the audio and converted it to AC3, you can mux the audio and video streams back together using MKVToolnix.
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Old 2nd July 2010, 11:30   #4  |  Link
bubbleboy11
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Thanks ! I'll give it a shot!
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Old 5th July 2010, 11:33   #5  |  Link
bubbleboy11
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Originally Posted by Adub View Post
If you have extracted the audio and converted it to AC3, you can mux the audio and video streams back together using MKVToolnix.
I've managed to mux them together, but MKVToolnix tells me it doesn't know the FPS, so the audio is totally out of sync. Is there a program to check the FPS for a .mkv file?

thanks again!

Last edited by bubbleboy11; 5th July 2010 at 12:35.
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Old 11th July 2010, 01:52   #6  |  Link
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Old 13th March 2011, 07:19   #7  |  Link
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you can try this video converter ,it cn meet your needs.

http://videotools.over-blog.com/page...r-4758345.html
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Old 16th March 2011, 20:34   #8  |  Link
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The warning in MKVMerge you speak of is just some stupid error because the input can never detect the FPS of raw h.264 streams. You need to manually set the FPS in the "Format Specific Options" tab with your h.264 stream highlighted under the "Tracks, chapters and tags:" box. Otherwise it just blindly assumes the video is 25 FPS PAL.
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Old 17th March 2011, 11:18   #9  |  Link
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Quote:
Originally Posted by bubbleboy11 View Post
Hi,

I have a .mkv file with a TRUEHD audio stream. I want to convert the audio to .ac3. Is there a program that will do this automatically?

If not, I have managed to extract the audio and make a separate .ac3 file. How do I insert this into the now audioless .h64 file and rebuild the .mkv file and make sure it syncs up?

thanks!

BB
1. TrueHD already has ac3 audio in it as its core. Usually the core is 640 kbps.
=>
You don't need to convert truehd to get 640 kbps ac3, you can just extract it from truehd.
2. You can mux the video + audio into an *.mkv file using mvktoolnix, just don't forget to manually add the framerate. It's 23.976 fps for most Blu-Ray videos.
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Old 17th March 2011, 15:04   #10  |  Link
ramicio
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TrueHD is not like DTS-HD Master where the codec itself is based around keeping a lossy core for decoders to fall back on. There can be TrueHD both with and without a AC-3 core.
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