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

Roger Pack rogerdpack2 at gmail.com
Wed Apr 24 16:41:46 CEST 2013

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.

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