I'm trying to render a MP4 video from an AVI, and every time I try I'm told that it failed but the reason could not be determined. I don't know much about MP4 but the options I've tried were Mainconcept AVC/AAC (*.mp4) and within that, either Internet HD 720p or Internet 480p 4:3. Per MediaInfo the AVI file is 24.4 Mb/s 720*480 (4:3) at 29.79 (30000/101) FPS. DV (Sony) (NTSC) (DVCPRO). I'm using Vegas Pro 11/0 (Build 371) 64-bit on a Windows 10 PC.
I can write the same except to a MOV file with no problem, writing to Video Sorenson 3 compression (best), 655 x 480, 15 fps, progressive, pixel aspect ratio=1.00
Thanks in advance for your help.