[Libav-user] Creating seekable video files without seekable IO

Richard Hussong rhussong at westpond.com
Thu Sep 19 20:19:50 EEST 2019

Ondrej -

If you are in charge of the receiving client, it could receive the
non-seekable stream and re-mux it into a seekable container using ffmpeg or
the libraries. I don't know any other way to accomplish what you want, but
I am not an ffmpeg expert.

- Richard Hussong

On Wed, Sep 18, 2019 at 5:50 AM Ondřej Perutka <perutka.ondrej at gmail.com>

> Hi,
> I'm trying to solve a little puzzle here. I'm looking for a container that
> would allow me to create a video file "on the fly" and stream it over HTTP.
> But I also need the result to be seekable.
> To add more details, I have a storage with MPEG-TS video segments
> (thousands of hours of continuous video). I need to create a server
> application that would take a given set of continuous segments from the
> storage, it would mux it into an appropriate container and stream it over
> HTTP to a client. The client can save it as a file, play it back and seek
> in it.
> The video codec can be either h264 or MJPEG. There can be also an audio in
> AAC.
> Right now I'm using fragmented MP4 but not all players can seek in it.
> From what I understand, the MP4 muxer puts the MOOV atom to the end of the
> file by default, so it should be possible. Unfortunately, when I tried to
> create a regular MP4 (i.e. not fragmented) with AVIOContext which does not
> support seeking, the result wasn't playable.
> Please note that I cannot create the whole MP4 file on the server and
> stream it via HTTP when it's done. There would be a big delay and I also
> want to avoid disk IO because of scalability.
> Thanks for your help.
> Ondrej
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