[Libav-user] formats that support variable frame rate

[YIRAN LI]

Hi guys,

Could anyone help to sort out among following formats, which ones support
variable frame rate so that video frames in the file can have variable
duration?

   - MP4, MOV
   - MPG
   - AVI
   - FLV
   - DV
   - MKV
   - OGG
   - RM
   - SWF
   - WEBM


Is variable frame rate only a muxer thing so that I don't need to worry
about encoder can't encode incoming frames at different intervals? If a
muxer can't handle frames with variable duration then I must set a fps, and
frame duration must be 1/fps?

Thanks for help
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