> On Nov 5, 2024, at 08:36, wzq via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
> wrote:
>
> From: wzqzero <1918583...@qq.com>
>
> When converting a two-minute 3840 x 2160 video to a GIF file,
> the viewing duration is shorter than the source duration when you use ffmpeg
> -i,
> which is due to data overflow,
> which causes positive numbers to become negative after being assigned,
> causing the gif_skip_subblocks to fail.
LGTM, although I’m shocked by 4K gif usecase.
>
> Signed-off-by: wzqzero <1918583...@qq.com>
> ---
> libavformat/gifdec.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libavformat/gifdec.c b/libavformat/gifdec.c
> index d5f06adc64..b026fa34ea 100644
> --- a/libavformat/gifdec.c
> +++ b/libavformat/gifdec.c
> @@ -99,9 +99,9 @@ static int resync(AVIOContext *pb)
> return 0;
> }
>
> -static int gif_skip_subblocks(AVIOContext *pb)
> +static int64_t gif_skip_subblocks(AVIOContext *pb)
> {
> - int sb_size, ret = 0;
> + int64_t sb_size, ret = 0;
>
> while (0x00 != (sb_size = avio_r8(pb))) {
> if ((ret = avio_skip(pb, sb_size)) < 0)
> --
> 2.43.0.windows.1
>
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