I ungrouped an .MOV file from my wife's iPhone 10 in Vegas Pro 17, and replaced the audio track with a WAV file. After synching the MOV video track with the new WAV audio file, I regrouped them. How do I render both in the same quality that the MOV file was in?
We might be able to help you if you tell us what your wife's MOV file is?
Muxing is usually my go-to option to replace the audio track without touching the picture. It depends on the codec. Same thing for 'smart rendering'
I was able to replace the audio in an iPhone video
General Complete name : \\4K60 iPhone\gsmarena_v007.mov Format : MPEG-4 Format profile : QuickTime Codec ID : qt 0000.00 (qt ) File size : 149 MiB Duration : 11 s 263 ms Overall bit rate mode : Variable Overall bit rate : 111 Mb/s Encoded date : UTC 2018-09-23 14:08:00 Tagged date : UTC 2018-09-23 14:08:41 Writing library : Apple QuickTime com.apple.quicktime.make : Apple com.apple.quicktime.model : iPhone XS com.apple.quicktime.software : 12.0 com.apple.quicktime.creationdate : 2018-09-22T15:58:30+0300 com.apple.photos.originating.signature : AZzQWwdxOo6+PlGyhazqyh8VQ41m Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L5.1 Format settings : CABAC / 2 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 2 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 11 s 263 ms Bit rate : 106 Mb/s Width : 3 840 pixels Height : 2 160 pixels Display aspect ratio : 16:9 Frame rate mode : Variable Frame rate : 60.000 FPS Minimum frame rate : 60.000 FPS Maximum frame rate : 66.667 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.213 Stream size : 142 MiB (95%) Title : Core Media Video Encoded date : UTC 2018-09-23 14:08:00 Tagged date : UTC 2018-09-23 14:08:41 Color range : Limited Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 Codec configuration box : avcC Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 11 s 262 ms Source duration : 11 s 331 ms Bit rate mode : Variable Bit rate : 163 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 44.1 kHz Frame rate : 43.066 FPS (1024 SPF) Compression mode : Lossy Stream size : 224 KiB (0%) Source stream size : 225 KiB (0%) Title : Core Media Audio Encoded date : UTC 2018-09-23 14:08:00 Tagged date : UTC 2018-09-23 14:08:41 Other #1 Type : meta Duration : 11 s 263 ms Other #2 Type : meta Duration : 11 s 263 ms
using tsMuxer and save to an m2ts file. I rendered the audio in Vegas to match the unedited video, then replaced the audio in the original iPhone video. tsMuxer whined about the result, but it plays.
There are a few muxing apps, I usually use MeGUI for AVC/AAC files. MP4box and AvideMux are others I have tried.