[FFmpeg-devel] [RFC] image2 and filename patterns

[Roger Pack]

On 1/24/13, Stefano Sabatini <stefasab at gmail.com> wrote:
> Hi,
>
> I'm trying to address ticket #1969 and I'm collecting a few ideas and
> seeing some (minor) nuisances.
>
> My idea is to implement something like this:
> ffmpeg INPUT -f image2 -pattern_type sequence_ts foo-%06d.png
>
> which would force to encode the timestamps in microseconds (or
> selectable) in the output files.
>
> -pattern_type would be based on the image2 demuxer homonymous option,
> values could be for example:
> sequence
> sequence_ts
>
> Currently file overwrite is implemented through the not very intuitive
> option named 'updatefirst', a possibly cleaner solution would be to
> adopt another pattern like '-pattern_type file' (which would also
> avoid pattern escaping on the user side).
>
> The 'file' and 'sequence_ts' could be ported to the image2 demuxer
> (the first would avoid the need for a -loop option at the application
> level, for example in ffmpeg or in the movie filter).
>
> In the mentioned ticket a pattern of the form '%pts' was suggested,
> but I'm opposed to this for various reasons (need to convert %t
> sequence to an av_get_frame_filename() pattern, impredictability in
> case of arbitrary filenames provided by the user).

I have thought recently that it might be nice to have "eval" like
functionality for filenames, then you could insert the current
timestamp, etc...
In case it's related to this discussion.
Thanks!
-roger-