[MEncoder-users] Quick question - advice appreciated

[Loren Merritt]

On Wed, 2 Aug 2006, The Wanderer wrote:
> Nicolas George wrote:
>
>> It is not as simple as that. Otherwise, it would be very easy, since
>> your solution one is already implemented (AVI, for example, has an
>> index of all frames).
>
> My understanding from years of reading these mailing lists has been that
> AVI does *not* have an index of all frames, but only an index of (at
> most) all keyframes (or, at least, all I frames). Handling those frames
> for backwards playing is trivial, but P (and, potentially, B) frames
> make the issue noticeably more complicated.

mplayer -v -v foo.avi
prints the headers, including the position, size, timestamp, and keyframe 
flag of each video frame and each audio packet.

--Loren Merritt