Судя по документации NetStream должен без проблем воспроизводить MPEG-4 формат, в доках сказано
Цитата:
Adobe AIR and Flash Player 9.0.115.0 and later versions support files derived from the standard MPEG-4 container format. These files include F4V, MP4, M4A, MOV, MP4V, 3GP, and 3G2 if they contain H.264 video, HEAAC v2 encoded audio, or both. H.264 delivers higher quality video at lower bit rates when compared to the same encoding profile in Sorenson or On2. AAC is a standard audio format defined in the MPEG-4 video standard. HE-AAC v2 is an extension of AAC that uses Spectral Band Replication (SBR) and Parametric Stereo (PS) techniques to increase coding efficiency at low bit rates.
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Specify the stream name (in the "samples" directory) as a string with the prefix mp4: The prefix indicates to the server that the file contains H.264-encoded video and AAC-encoded audio within the MPEG-4 Part 14 container format. If the file on the server has a file extension, specify it.
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Код AS3:
ns.play("mp4:samples/myvideo.mov");
Но Generation Mode поддерживает только flv. Есть такое
решение на stackoverflow. И сам
скрипт.