How to Attach an Audio File to a Video File Without Rendering Together

IrishNachos wrote on 10/13/2023, 2:44 PM

Hello, I have an audio recording that I want to attach to a video file I edited in Vegas Pro 21. I do not want the audio file affected in any way, therefore, do not want to render it with the video file. How can I attach the audio and video files together?

Thank you!

Vegas Pro 21.0

Windows 10x 64

CPU: Ryzen 9 5950X

RAM: 64 GB

GPU: AMD RX 6800



rraud wrote on 10/13/2023, 4:02 PM

Muxing can embed an audio file to a video. There is free muxing sofware available

rraud wrote on 10/13/2023, 4:11 PM

Hi @IrishNachos, if Vegas cannot 'smart render' the audio to your existing file type (MP4 and such), a Muxing utility can embed an audio to the video file.. There are free muxers available. What is the video file's format?

IrishNachos wrote on 10/13/2023, 4:38 PM

Thank you, I'll give using a muxer a try. The video file will render as an .mp4 and the audio is a .wav file.

rraud wrote on 10/14/2023, 12:17 PM

AFAIK @IrishNachos, a PCM (wave) file cannot be muxed into a AVC/MP4 video. The audio must first be encoded to the AAC audio format which usually has a .mp4 or ,m4u extension. For muxing audio to AVC video, I have used MeGUI, Avidmux and MP4Box. For encoding an AAC file, Nero's AAC Encode or FFMPEG is allegedly the best.. but my old and abused ears cannot hear any difference in an A-B compassion using the native AAC audio encoders in Vegas and Sound Forge.
If you are rendering the video, just put the PCM file on the timeline and forget about the encoding and muxing. If the video is already rendered, muxing in the audio is the way to go and does not re-render or re-encode either component.

mark-y wrote on 10/14/2023, 12:30 PM

XAVC-S is a playable .mp4 format that designates WAV (LPCM) audio with AVC video.

It should work fine on @IrishNachos home system.

It is not a sharing or delivery format, in that streaming services will convert the audio to AAC, same as any other format.