PGS and VOBSUB subtitles are graphical, and so can not be muxed by MP4tools, though they can be burned. Muxed subtitles are missing from the output: Only text-based subtitles can be muxed into MP4/M4V videos.Check the log file(s) that should have been created (if keep log files is checked in preferences) for error messages. The output video is missing, smaller than it should be, or is not playable: Some error occurred during processing.For now, there is an option in MP4tools what will remux the video with no quality loss that seems to fix the issue in most cases. Videos played in the newest update for Apple TV (6.1) stutters during panning: This seems to be a Apple issue as the same files played fine on other iDevices and older versions of Apple TV OS.Also, I periodically read this forum and can chime in with specific MP4tools issues. Probably the best resource would be useful Mac video forums found here or here. You'll find lots of people there willing to help and with more knowledge about general video issues than I have. The web sites for the individual Tools could also prove helpful. Examining these log files should give you some hints regarding what the Unix applications are having issues with. This option is found in the MP4tools preferences. To help evaluate causes of strange behavior, you can select to keep the log files that are created during processing. As discussed on the Tools page, MP4tools is an Objective-C application that acts as an interface for a number of UNIX command-line applications. So if you encounter problems with MP4tools, often it's an issue with one of the UNIX applications.
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