Sony Vegas Pro supports H.264 natively although, like Adobe Premier, it is pretty picky with the codecs of what it’ll accept. As far as I know Sony Vegas Pro doesn’t like H.264 in an AVI container. If you want to import H.264 to Sony Vegas Pro flawlessly, I recommend you to convert H.264 to a more editable format for Vegas Pro.
I have used Brorsoft Video Converter to do just that. I encode my H.264 files to MPEG-2 for Sony Vegas Pro. It works just fine. The program is the best H.264 file converter. With it, you can effortlessly transcode H.264 to MPEG-2 or WMV, which will create a Sony Vegas Pro friendly file format keeping the original quality. Besides Vegas, this software can also export DNxHD for Avid, MPEG-2 for Adobe Premiere Pro, Premiere Element, AVI for Pinnacle Studio, WMV to Windows Movie Maker and more NLE systems for native editing. Just download it and follow the tutorial below to get the work done.
Convert/Import H.264 clips to Sony Vegas Pro
Step 1: Add H.264 video files
Install and launch the H.264 Video converter and load source H.264 clips to it. You can batch convert multiple video clips as you want.
Step 2: Choose output format
Click “Format” pull down list to select Adobe Premiere/Sony Vegas> MPEG-2(*.mpg) as the best video format for Sony Vegas Pro. WMV format is the good choice as well.
Tip – Profile Settings:
In case the default settings do not fit your requirement, you can click “Settings” button and enter “Profile Settings” panel to adjust video size, bit rate, frame rate, sample rate and audio channels.
Step 3: Start H.264 video conversion
Click “Convert” button to start encoding H.264 video to MPG/WMV for importing to Sony Vegas Pro 9/10/11/12. When the conversion task is finished, click “Open” button to get the exported files and then import the converted H.264 files into Vegas Pro to do further editing without any issue.