[FFmpeg-devel] [PATCH] ffprobe: add -show_headers_first option

Stefano Sabatini stefasab at gmail.com
Thu Sep 8 14:25:50 EEST 2016

On date Sunday 2016-09-04 19:09:32 +0200, Nicolas George encoded:
> Le nonidi 19 fructidor, an CCXXIV, Stefano Sabatini a écrit :
> > This is meant to be used for generating output suitable for the
> > ffprobe_default demuxer.
> > ---
> >  ffprobe.c | 30 ++++++++++++++++++++++++++----
> >  1 file changed, 26 insertions(+), 4 deletions(-)
> I find the naming a bit clumsy. It says what it says, but what it the next
> step? -show_format_after_frames_but_before_streams?
> I would like to suggest another avenue, a little more work but not by much:
> deprecate all the -show_<section> options, and replace them by a single
> -show option that takes the sections name in order:
> ffprobe -show packets,streams,format
> would be equivalent to the current "ffprobe -show_frames -show_streams
> -show_format", but:

> ffprobe -show format,streams,packets

We have the -show_entries option, and we can extend it to consider
order. The equivalent syntax will then be:

ffprobe -show_entries format,streams,packets

> would yield the same result as with -show_headers_first.
> The syntax could later be updated for various extra features:

> ffprobe -show format,streams,packets,rewind,packets+frames=silent=1,streams

Now the problem with this idea is the interaction with
-read_packets. The option was useful to force reading of packets so
that the gained information was also available in the streams and
format sections (but without showing the packets output).

I can think about extending the -show_entries syntax, so that we could

-show_entries !packets,format,streams

What I don't like is that this special syntax will only work with
packets (it makes no sense for the other sections).

FFmpeg = Fast Fiendish Monstrous Perfectionist Encoding/decoding Gorilla

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