"streamselect" filter, "map" parsing

[ManDay]

It seems the streamselect filter (which is important, because it is the only method to consistently define substitution macros!) does not parse the map beyond the first argument:

const int n = strtol(map, &p, 0);  

if (map == p)
    break;
map = p;

will at most read up to the first (unspecified) seperator, whence it stops. Instead, I think, should read

if (map == p)
    break;

map = p + (*p != '\0');

https://ffmpeg.org/doxygen/trunk/f__streamselect_8c_source.html#l00205

[ManDay]

The problem disappears when whitespace is used as the seperator (which is undocumented), because strotol will skip past it.

[MasterQuestionable]

͏    https://ffmpeg.org/ffmpeg-filters.html#streamselect_002c-astreamselect
͏    Semantic-wise poor design, seemingly.

͏    Probably related:
͏    https://ffmpeg.org/ffmpeg-filters.html#sendcmd_002c-asendcmd

[ManDay]

Why is this reopened?

[MasterQuestionable]

͏    Potential documentation issue.
͏    (probably also else)

͏    Related:
͏    ​https://trac.ffmpeg.org/ticket/11100
͏    ​https://trac.ffmpeg.org/ticket/11104

[MasterQuestionable]

͏    Would you explain somewhat, what sort of application do you have with alike filters?
͏    The feedback may help analyzing the relevant filters' design.