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F4V File Format
You might have read my post about my FLV meta data and cue point reader/writer. You might also know that the F4V format (which really is simple MP4+H264+AAC) succeeded to the FLV format, and is supported by Flash 9.0.115 and up.

The MP4Info class is a simple extensible PHP class reading the MP4 container’s frames (called boxes) to get various information, namely the video duration, the video/audio codecs, the width and the height, as well as the embedded XMP meta data.

The F4V format is better than the FLV format in many aspects:

  • Better compression ratio
  • Better quality at similar bit rates
  • Open source compressors available, through ffmpeg and libh264 (Flash 8 On2 VP6 codec is proprietary)
  • Decoding H.264 is a lot less CPU intensive on the host computer than decoding On2 VP6
With Flash 9 being at a rate of penetration of 98.9% in mature markets1 and will all the advantages, MP4 Flash video is becoming more and more common.

It really only has been tested with Sorenson Squeeze encoded F4V files for now, and therefore should be considered beta.

You’ll find the project at Google Code, under php-mp4info.

1 As per Adobe’s Adobe Flash Player Version Penetration statistics, on June 11, 2009
2 F4V logo at the top found at Flash Develop And Design