Converting .264 videos to .avc format.
Converting Ripped Video Data Files directly to MPEG-4 Advanced Video Coding Movie Format (.264 to .avc conversion) is certainly possible and should be quite straightforward.
Try using video editing programs or conversion tools, such as the Freemake Video Converter, which allows users to import 264 videos and export them in AVC format.
A video converting tool
One of the most popular and successful free video conversion softwares