[Libav-user] streaming format

YIRAN LI mrfun.china at gmail.com
Tue Mar 20 00:58:23 EET 2018

2018-03-20 0:49 GMT+11:00 Sebastian Guttenberg <sgutten at ms2-gmbh.de>:

> I'm looking for a streaming format so that one program can write to a file
> while another program can read/play it at same time.
> Seems webm can do it. but when play it with ffplay seems the newly written
> data are not read out. I googled and see people saying the amount of data
> can be read is determined when the read file handler is opened, that means
> there's no way in 2nd process to keep up with 1st process. Does anyone have
> experience on this?
> I have no experience with ffplay, but it is definitely possible to
> transcode a file with ffmpeg and at the same time read it with another
> program, like with your own c- or java- or whatever code. I’m doing that
> and it works. I’m not sure if ffplay or other players can be persuaded to
> do so.
> Hi Sebastina, do you mean as long as write speed is fast enough, the
reading side, after file opened, can read out data that are written after
the file is opened? ​

> Secondly, whatelse streaming formats do we have? I originally thought avi
> should be but seems ffplay can't play it when it's beeing written so I
> guess it's not.
> As far as I know, the '.ts‘ - container was designed explicitly for
> streaming ( MPEG-TS ), in particular for continous live streaming.
> Webm also works but is relatively slow in transcoding. mp4 is also
> possible, but in order to use mp4 for streaming, you have to set a couple
> of parameters while transcoding and switch the moov-atom off completely
> (via „-movflags isml+empty_moov“), because the information necessary for
> the moov atom is complete only when the transcoding-process is finished.
> About avi I don’t know if it’s suitable.
> Thanks for the MP4 part, I'll have a look at it.​
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