[FFmpeg-devel] [PATCH 1/2] fftools/cmdutils: fix error message for "ffmpeg -init_hw_device list"

[mypopy at gmail.com]

On Wed, Mar 26, 2025 at 7:33 PM Zhao Zhili
<quinkblack-at-foxmail.com at ffmpeg.org> wrote:
>
>
>
> > On Mar 26, 2025, at 18:38, Jun Zhao <mypopy at gmail.com> wrote:
> >
> > From: Jun Zhao <mypopydev at gmail.com>
> >
> > When running 'ffmpeg -init_hw_device list' to display available hardware
> > devices, it incorrectly shows an error message:
> > "Failed to set value 'list' for option 'init_hw_device': Immediate exit requested"
> >
> > This is a regression introduced by commit a50f90f1c23. The command is
> > actually working as intended - it should exit after listing devices, but
> > shouldn't display an error message.
> >
> > Signed-off-by: Jun Zhao <barryjzhao at tencent.com>
> > ---
> > fftools/cmdutils.c | 8 +++++---
> > 1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/fftools/cmdutils.c b/fftools/cmdutils.c
> > index 8ac20bf049..aa782c7754 100644
> > --- a/fftools/cmdutils.c
> > +++ b/fftools/cmdutils.c
> > @@ -352,9 +352,11 @@ static int write_option(void *optctx, const OptionDef *po, const char *opt,
> >
> >         ret = po->u.func_arg(optctx, opt, arg);
> >         if (ret < 0) {
> > -            av_log(NULL, AV_LOG_ERROR,
> > -                   "Failed to set value '%s' for option '%s': %s\n",
> > -                   arg, opt, av_err2str(ret));
> > +            if (strcmp(opt, "init_hw_device") || strcmp(arg, "list")) {
> > +               av_log(NULL, AV_LOG_ERROR,
> > +                      "Failed to set value '%s' for option '%s': %s\n",
> > +                      arg, opt, av_err2str(ret));
> > +            }
>
> Clang-tidy shows "Function 'strcmp' is called without explicitly comparing result”.
>
> Missing `!` is a common mistake when use strcmp. The static analysis tool doesn't know whether it’s
> a typo or on purpose in `if (strcmp())`, so it requires explicitly comparing result `if (strcmp() != 0)`.
>
I have no objections to explicitly comparing the return values of strcmp
> >             goto finish;
> >         }
> >     }
> > --
> > 2.25.1
> >