Ac3 tracks aren’t compatible with Vegas. You’d need to convert it to an aac, mp3, pcm, or wav file. The PCM option is probably what you’re looking for if you want lossless. I believe the stereo downmix refers to what you are hearing while editing if you edit your 5.1 mix in stereo. Your render will output a 5.1 surround track if you select that in the settings.
Hello.
I have not been able to do that. Star Wars I Blu Ray uses a DTS-ES 6.1 English audio track that can be converted to WAV but as i had already done changes in the project timeline, cutting parts and altering audio, i can´t replace just the audio. In adition i was using an AC3 5.1 downmix of the 6.1 DTS-ES that was importing good to Vegas with apparently correct channel distribution but suddenly it is importing only Channels 1/2 in the 6 previous audio tracks in the timeline.
In addition, i don´t see how you can export loseless 6.1 in Vegas. When starting a Project it doesn´t allow yo to choose anything besides Stereo and 5.1. And when rendering, i couldn´t find it as well. I went to customize render options, 7 channels but it says it doesn´t fit with the project properties.
So… Is there any way to import a loseless 6.1 track to Vegas that can also be rendered after editing?
Is there a way to replace the audio only from the videofile? I tried to mux mp4 with the loseless WAV and it said mp4 doesn´t support it. Then tried changing mp4 to m2ts and it worked but the file can´t be imported to Vegas. So i can´t do nothing…