> 在 2020年1月30日，下午10:03，Jun Zhao <mypopy...@gmail.com> 写道：
>
> From: Jun Zhao <barryjz...@tencent.com>
>
> fix crash when used the command like:
> - ffmpeg -h protocol
> - ffmpeg -h protocol=
>
> Signed-off-by: Jun Zhao <barryjz...@tencent.com>
> ---
> fftools/cmdutils.c | 8 +++++++-
> 1 files changed, 7 insertions(+), 1 deletions(-)
>
> diff --git a/fftools/cmdutils.c b/fftools/cmdutils.c
> index 2284631..f0f2b4f 100644
> --- a/fftools/cmdutils.c
> +++ b/fftools/cmdutils.c
> @@ -1872,8 +1872,14 @@ static void show_help_demuxer(const char *name)
>
> static void show_help_protocol(const char *name)
> {
> - const AVClass *proto_class = avio_protocol_get_class(name);
> + const AVClass *proto_class;
>
> + if (!name) {
> + av_log(NULL, AV_LOG_ERROR, "No protocol name specified.\n");
> + return;
> + }
> +
> + proto_class = avio_protocol_get_class(name);
> if (!proto_class) {
> av_log(NULL, AV_LOG_ERROR, "Unknown protocol '%s'.\n", name);
> return;
> --
> 1.7.1
>
fix it in avio_protocol_get_class is better than here.
so i have send the other patch to fix this problem.
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Steven
Thanks
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