[FFmpeg-user] Why does the 'detelecine' filter exist?

[Carl Zwanzig]

On 5/29/2025 9:40 AM, Mark Filipak wrote:
> I can't "make patches". I'm not a 'C' programmer.

HAVE YOU EVEN LOOKED AT THE DOC SOURCE???????


Much of the doc is in textinfo format, not in c. but since apparently 
you haven't looked, you might not know that. Try reading 
https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/refs/heads/master:/doc/filters.texi

And even without knowing c but having some/any programming experience, 
this should be reasonably comprehensible--

static const AVOption chorus_options[] = {
      { "in_gain",  "set input gain",  OFFSET(in_gain), 
AV_OPT_TYPE_FLOAT,  {.dbl=.4}, 0, 1, A },
      { "out_gain", "set output gain", OFFSET(out_gain), 
AV_OPT_TYPE_FLOAT,  {.dbl=.4}, 0, 1, A },
      { "delays",   "set delays",      OFFSET(delays_str), 
AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
      { "decays",   "set decays",      OFFSET(decays_str), 
AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
      { "speeds",   "set speeds",      OFFSET(speeds_str), 
AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
      { "depths",   "set depths",      OFFSET(depths_str), 
AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
      { NULL }
};
(https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/refs/heads/master:/libavfilter/af_chorus.c)

Sure, might have to find how AVOption is defined, but it's pretty clear 
what "in_gain" does and a rough guess suggests the default value is .4 .

Make an effort. (And really, c isn't that difficult to read.)

z!