Update clap to 4.4

[patrickelectric]

Helps #321

It appears that it did not fix the problem, this PR address the issue using the new configuration on clap 4.4 default_missing_value

[joaoantoniocardoso]

Closes #122

[joaoantoniocardoso]

I don't know why, but somehow it is defining the wrong possible values

[joaoantoniocardoso]

Failing for --gst-feature-rank omxh264enc=0,v4l2h264enc=250,x264enc=260

[joaoantoniocardoso]

Failing for --gst-feature-rank omxh264enc=0,v4l2h264enc=250,x264enc=260

The parser needs to return the value. Fix:

fn gst_feature_rank_validator(val: &str) -> Result<String, String> {
    if let Some((_key, value_str)) = val.split_once('=') {
        if value_str.parse::<i32>().is_err() {
            return Err("GST_RANK_INT_VALUE should be a valid 32 bits signed integer, like \"-1\", \"0\" or \"256\" (without quotes).".to_string());
        }
    } else {
        return Err("Unexpected format, it should be <GST_PLUGIN_NAME>=<GST_RANK_INT_VALUE>, where GST_PLUGIN_NAME is a string, and GST_RANK_INT_VALUE a valid 32 bits signed integer. Example: \"omxh264enc=264\" (without quotes).".to_string());
    }
    Ok(val.into())
}

[joaoantoniocardoso]

Well done, thanks!!

[patrickelectric]

Thanks for the review!