using aacgain to modify volume of m4v videos, problem recognizing large files? Options

[timcupery]

When I encode DVD movies to mp4/m4v (h264 video and aac audio) using Handbrake, I then change the file extension to .m4a and replaygain-scan the audio stream. I can do the scanning in either foobar2000 or AACgain (the modified MP3gain variant which can also adjust frame-by-frame volume on aac files). Sometimes there is substantial clipping in the audio stream (with peak values of 1.5 or 1.6), and in such cases I can use AACgain to decrease the volume of the audio stream, before manually changing the file extension back to .m4v or .mp4

The problem I have noticed recently is that AACgain is unable to read some large files. foobar2000 will recognize all of these files with a .m4a extension and can scan replaygain and write tags. But for some movie files, AACgain hangs for a few seconds (apparently trying to read the file) and eventually shows the file but not any RG information that was already in the tags, and AACgain is unable to modify the gain of the file.

This has only happened once I started using Handbrake's "high quality" preset to encode movies; when using the "normal" preset, AACgain was able to recognize and modify gain on all movie files.
This may be a filesize issue (e.g., AACgain cannot handle files that are larger than 1gb) or have something to do with another setting in Handbrake's "high quality" preset.

Any ideas what is going on here? I am using AACgain 1.9