[FFmpeg-devel] [PATCH] ffmpeg_opt: inform user about -b:a and -b:v instead of legacy form

[Marth64]

Roger, will update. Thanks!

On Sat, Dec 9, 2023 at 1:25 PM James Almer <jamrial at gmail.com> wrote:

> On 12/9/2023 4:10 PM, Marth64 wrote:
> > ---
> >   fftools/ffmpeg_opt.c | 8 ++++----
> >   1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
> > index 304471dd03..5e50e5efa2 100644
> > --- a/fftools/ffmpeg_opt.c
> > +++ b/fftools/ffmpeg_opt.c
> > @@ -1721,8 +1721,8 @@ const OptionDef options[] = {
> >       { "force_key_frames", OPT_VIDEO | OPT_STRING | HAS_ARG |
> OPT_EXPERT |
> >                             OPT_SPEC | OPT_OUTPUT,
>            { .off = OFFSET(forced_key_frames) },
> >           "force key frames at specified timestamps", "timestamps" },
> > -    { "b",            OPT_VIDEO | HAS_ARG | OPT_PERFILE | OPT_OUTPUT,
>           { .func_arg = opt_bitrate },
> > -        "video bitrate (please use -b:v)", "bitrate" },
> > +    { "b:v",          OPT_VIDEO | HAS_ARG | OPT_PERFILE | OPT_OUTPUT,
>           { .func_arg = opt_bitrate },
> > +        "video bitrate", "bitrate" },
>
> "b" is for bitrate regardless of media type. The specifier that comes
> after it decides the type. You're probably breaking that by making "b"
> no longer be a valid option.
>
> IMO, change the description to "Stream bitrate".
>
> >       { "hwaccel",          OPT_VIDEO | OPT_STRING | HAS_ARG |
> OPT_EXPERT |
> >                             OPT_SPEC | OPT_INPUT,
>           { .off = OFFSET(hwaccels) },
> >           "use HW accelerated decoding", "hwaccel name" },
> > @@ -1762,8 +1762,8 @@ const OptionDef options[] = {
> >       { "acodec",         OPT_AUDIO | HAS_ARG  | OPT_PERFILE |
> >                           OPT_INPUT | OPT_OUTPUT,
>             { .func_arg = opt_audio_codec },
> >           "force audio codec ('copy' to copy stream)", "codec" },
> > -    { "ab",             OPT_AUDIO | HAS_ARG | OPT_PERFILE |
> OPT_OUTPUT,            { .func_arg = opt_bitrate },
> > -        "audio bitrate (please use -b:a)", "bitrate" },
> > +    { "b:a",            OPT_AUDIO | HAS_ARG | OPT_PERFILE |
> OPT_OUTPUT,            { .func_arg = opt_bitrate },
> > +        "audio bitrate", "bitrate" },
>
> And this just removes "ab" altogether, which is a break with no previous
> warning. b:a already works thanks to "b" above.
>
> Just flag this option as deprecated.
>
> >       { "atag",           OPT_AUDIO | HAS_ARG  | OPT_EXPERT |
> OPT_PERFILE |
> >                           OPT_OUTPUT,
>             { .func_arg = opt_old2new },
> >           "force audio tag/fourcc", "fourcc/tag" },
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