F4V Does Not Support Cue Points

Despite appearances…

F4V files (otherwise known as MPEG4-AVC / h.264 + a special Flash only file extension) DO NOT SUPPORT CUE POINTS. Unfortunately, no good tooling support for timed text tracks replaces them.

F4V is Retarded

Why F4V is the wrong decision:

• Destroys one of the great promises of MPEG4-AVC / h.264–interoperability.
• No single file deployment (closely tied to interoperability). I certainly imagine a world where a single piece of media can be posted on the web, downloaded and played back through Flash Player, iPhone / iPod, QuickTime, Apple TV, etc. Gone should be the days of providing different files for different browsers, plugins or mobile devices.
• Effectively reduces the usefulness the existing MPEG4-AVC / h.264 ecosystem. The MPEG4 spec urges .mp4 be used as the file extension and many vendors just refuse to work with something that has a different file extension.
• You lose out on much of the existing intelligent rss enclosure handling. Blogging platforms and plugins will recognize the .mp4 extension and auto-generate enclosures (very useful for delivering to feed readers and mobile devices).
• F4V just muddles the codec picture even more. Take a look at any of the encoder dialogs in CS4 and you’ll see a confusing slew of options (flv, f4v, h.264, h.264 blu-ray, etc.). Hell, I even heard an instructor in one of the MAX hands on sessions, urge students to steer clear of h.264 encodings since that was just HD / blu-ray stuff. He actually was pushing flv (pretty bizarre for an AfterEffects class).

I’m not trying to be a jerk, there are definite reasons Adobe may have chosen to use F4V:

• Apple did it (M4V). Yep, Apple screwed the pooch as well.
• It’s easy to associate file extensions with default application handlers (i.e. AMP is the default media player for *.flv and *.f4v files).
• Allows for a unique mime-type (Flash Player gets associated with a specific file type on servers).
• OS file choosers allow filtering by extension.
• F4V clearly establishes a file as compatible with the parts of the MPEG4 spec supported by Flash Player. This has the obvious advantage of visual associations / assumptions and might assist descriptions in documentation and marketing.

I guess I feel like there should be some sort of primary directive: “thou shalt not damage interoperability.” Any time you’re thinking of messing with the spec it should be examined through this lens. As valid as some of the reasoning for using F4V is, it fails, IMHO, when compared to the primary directive.