[MPlayer-users] Seek to frame for mencoder

[Bill Eldridge]

I've been pretty happy with the Linux vstrip port at
http://gd.tuwien.ac.at/opsys/linux/sf/v/vidtoolports

The resulting files are always playable by 3 different
clients, and it's very fast.

HR wrote:

>[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>
>I can imagine there are many uses for this, so I'd really like to see
>some ideas on implementing this. I've read previous posts regarding this
>issue, where no response was given
>(http://mplayerhq.hu/pipermail/mplayer-users/2003-June/033771.html).
>demux_seek() ofcourse calls the approprate demuxer, the problem as
>discussed elsewhere being that demux_seek_mpg() is "broken", at least
>for DVD (VOB) input. I don't know about the other demuxers, but I assume
>most of them might actually work. Thus, what we IMHO need ASAP is a
>demux_frameseek_mpg().
>
>I'm trying to read the mplayer source, trying to decide how to go about
>such a task. Although some of my questions here might be silly to some
>of you, and I have my suspicions for the answers beforehand, the answers
>would enlighten me nonetheless.
>
>Should/could a frame seek be done in the MPEG-PS video stream, assuming
>that's the format in the unencrypted/decrypted DVD VOB?
>
>Should/could the frame seek rather be done in a MPEG-ES? Demuxed from
>MPEG-PS?
>
>Skipping into a certain byteposition, relocating the nearest keyframe,
>can one tell which sequence number this frame has?
>
>Could a minimum of "fast forwarding" (ie "AV stream copy /dev/null") to
>a certain frame number be quickly implemented as a temporary quick-fix?
>Would be rather slow, but "something" is always a lot more than
>"nothing"...
>
>Is the reason why no one has done this for mplayer due to the task being
>incredibly difficult, or that no one regards it as sufficiently
>helpful/important/useful for it to be worth the effort?
>
>HR
>
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