How can I produce videos with lossless audio ?

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Solved by

Mar 17, 2012 19:52

I am capturing audio separately from my video, with a Roland VS-2400CD professional audio recorder. The audio is at 24 bit 96 kHz. I have up to 9 mono tracks. I transfer them to the computer as uncompressed mono WAV files.

Right now, I am mixing and rendering the tracks with REAPER to a single 24 bit 96 khz stereo WAV file.

I am able to successfully import this file to PowerDirector and produce my videos with it.

The problem is that it appears that the audio always gets compressed in the target M2TS or MP4 files. It ends up encoded as Dolby Digital Plus.

I noticed this because I couldn't change the volume in Windows media player when playing them.
It turns out WMP started using exclusive mode and transmitted the DD bitstream directly to my receiver.

DD is a lossy audio compression algorithm. I don't want to use it.
Is there any way to output video files with uncompressed audio, or with a lossless compression algorithm ?
And if so, how ?
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Carl312

Senior Contributor Location: Texas, USA Joined: Mar 16, 2010 20:11 Messages: 9090 Offline

Mar 17, 2012 20:29

You can do a custom M2TS profile and choose LPCM audio.

In the Produce Module choose AVC H.264, Either the 1920x1080 or 1920x1080p or the 1920x1080 (24 Mbps) in the Profile/Name Quality text box. Click the"+" (Create a New Profile). Give the profile a descriptive name Click Audio Tab, modify the Audio under Audio Compression use LCPM.

Click OK.


Filename	M2TS custom profile LPCM audio_note.png	Download
Description	full size image
Filesize	91 Kbytes
Downloaded:	206 time(s)

This message was edited 2 times. Last update was at Mar 17. 2012 20:35

Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Mar 17, 2012 21:40

Carl,

Thanks for the quick response !
However, it appears the bit rate is limited to 1536 Kbps.
My math says that is equivalent to 16 bit 48 kHz stereo.

It should be 3 times more for 24 bit 96 kHz stereo, ie. 4608 Kbps.

Also, it appears that if I use DD I can choose either stereo or 5.1, but for LPCM only stereo is possible.

I am only mixing in stereo right now, but might want to mix the audio in multi-channel LPCM later on since I have 9 microphones' worth of source material. Either 5.1 or 7.1 would be good.
MSI X99A Raider
Intel i7-5820k @ 4.4 GHz
32GB DDR4 RAM
Gigabyte nVidia GTX 960 4GB
480 GB Patriot Ignite SSD (boot)
2 x 480 GB Sandisk Ultra II SSD (striped)
6 x 1 TB Samsung 860 SSD (striped)

2 x LG 32UD59-B 32" 4K
Asus PB238 23" HD (portrait)

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Mar 18, 2012 22:36

Carl,

I actually tried that method when selecting the LPCM option.
Unfortunately, the resulting file has no audio at all when I play it back with Windows Media Player.

I can confirm when I look at the file's properties in Windows that everything is blank under the "audio" section - no bit rate, channels or audio sampling rate.

When I use DD it shows bit rate 256 kbps, channels stereo, audio sample rate 48000 ...

The file rendered with LPCM is larger than the one rendered with DD .

Maybe this is a bug with Windows Media Player.
When I drag the output file to the "edit" window in PD, it is able to play that file with audio.
MSI X99A Raider
Intel i7-5820k @ 4.4 GHz
32GB DDR4 RAM
Gigabyte nVidia GTX 960 4GB
480 GB Patriot Ignite SSD (boot)
2 x 480 GB Sandisk Ultra II SSD (striped)
6 x 1 TB Samsung 860 SSD (striped)

2 x LG 32UD59-B 32" 4K
Asus PB238 23" HD (portrait)

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Mar 19, 2012 02:51

I think this is likely an encoding bug in PowerDirector .
I reproduced it in PD10 trial as well.
Can anyone else reproduce this problem ?

Quote: Carl,

I actually tried that method when selecting the LPCM option.
Unfortunately, the resulting file has no audio at all when I play it back with Windows Media Player.

I can confirm when I look at the file's properties in Windows that everything is blank under the "audio" section - no bit rate, channels or audio sampling rate.

When I use DD it shows bit rate 256 kbps, channels stereo, audio sample rate 48000 ...

The file rendered with LPCM is larger than the one rendered with DD .

Maybe this is a bug with Windows Media Player.
When I drag the output file to the "edit" window in PD, it is able to play that file with audio.

MSI X99A Raider
Intel i7-5820k @ 4.4 GHz
32GB DDR4 RAM
Gigabyte nVidia GTX 960 4GB
480 GB Patriot Ignite SSD (boot)
2 x 480 GB Sandisk Ultra II SSD (striped)
6 x 1 TB Samsung 860 SSD (striped)

2 x LG 32UD59-B 32" 4K
Asus PB238 23" HD (portrait)

Bastian74

Senior Member Joined: Dec 06, 2010 12:12 Messages: 204 Offline

Mar 21, 2012 15:01

It sounds like what you want is Dolby® TrueHD, which PD does not support.

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Mar 21, 2012 20:13

Quote: It sounds like what you want is Dolby® TrueHD, which PD does not support.

No. I'm looking for uncompressed LPCM audio.
MSI X99A Raider
Intel i7-5820k @ 4.4 GHz
32GB DDR4 RAM
Gigabyte nVidia GTX 960 4GB
480 GB Patriot Ignite SSD (boot)
2 x 480 GB Sandisk Ultra II SSD (striped)
6 x 1 TB Samsung 860 SSD (striped)

2 x LG 32UD59-B 32" 4K
Asus PB238 23" HD (portrait)