[FFmpeg-user] Alternative to Dynamic Text

[LianCheng]

Yes, would like to know in ffmpeg, under drawtext, the textfile (reload=1)
is using read-write or read-only mode?



On Thu, 4 Nov 2021 at 00:50, Francois Visagie <francois.visagie at gmail.com>
wrote:

> > From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of
> > Adam Nielsen via ffmpeg-user
> > Sent: 03 November 2021 15:10
> > To: LianCheng Tan
> > Cc: Adam Nielsen; FFmpeg user questions
> > Subject: Re: [FFmpeg-user] Alternative to Dynamic Text
> >
> > > I have tried to do what you have suggested. Somehow, it still cause
> > > ffmpeg to crash at the exact moment the file is being renamed.
> > >
> > > By the way, I am running in Windows environment. Not sure, if in Linux
> > > will this issue occurs.
> >
> > It works fine for me but I'm on Linux.
> >
> > If renaming doesn't work, have you tried copying the new file over the
> top
> of
> > the old one?
> >
> > I'm not familiar enough with Windows to know how to atomically overwrite
> a
> > file.  But I searched Google and found this:
> >
> >   https://stackoverflow.com/questions/167414/is-an-atomic-file-rename-
> > with-overwrite-possible-on-windows
> >
> > It suggests there is a Windows API function called MoveFileTransacted()
> that
> > you could use.
> >
> > I'm surprised just opening the file in read-write mode, seeking to the
> start,
> > then writing your content doesn't work though.  You might get a frame
> here
> > or there with incomplete data but it won't cause ffmpeg to exit with an
> error.
>
> Possibly the original poster is opening the file with read-write mode also
> from within ffmpeg.
>
> That would be unnecessary, and could also explain "... ffmpeg unable to
> read
> the textfile when the other process is updating it."
>
> >
> > Cheers,
> > Adam.
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