On Tue, Feb 13, 2018 at 12:24:41PM -0800, Xiaohan Wang (王消寒) wrote: > New patch as discussed offline: > > > > On Sat, Feb 3, 2018 at 2:29 AM, Xiaohan Wang (王消寒) <xhw...@chromium.org> > wrote: > > > > >
> h264_cavlc.c | 1 +
> 1 file changed, 1 insertion(+)
> a6bff5246e55cd4a75eff5ccaf5c8ecfd20c1cba
> 0001-ffmpeg-Set-valid-qscale-value-in-ff_h264_decode_mb_c.patch
> From e8ad6159640c913773583a8b551ecebcff6b9c63 Mon Sep 17 00:00:00 2001
> From: Xiaohan Wang <xhw...@chromium.org>
> Date: Sat, 3 Feb 2018 01:43:35 -0800
> Subject: [PATCH] ffmpeg: Set valid qscale value in ff_h264_decode_mb_cavlc()
>
> When ff_h264_decode_mb_cavlc() failed due to wrong sl->qscale values,
> e.g. dquant out of range, set the qscale to be a valid value before
> returning -1 and exiting the function. The qscale value can be used
> later e.g. in loop filter.
>
> BUG=806122
> ---
> libavcodec/h264_cavlc.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/libavcodec/h264_cavlc.c b/libavcodec/h264_cavlc.c
> index 2421beed9d..a7e60676a0 100644
> --- a/libavcodec/h264_cavlc.c
> +++ b/libavcodec/h264_cavlc.c
> @@ -1110,6 +1110,7 @@ decode_intra_mb:
> else sl->qscale -= max_qp+1;
> if (((unsigned)sl->qscale) > max_qp){
> av_log(h->avctx, AV_LOG_ERROR, "dquant out of range (%d) at
> %d %d\n", dquant, sl->mb_x, sl->mb_y);
> + sl->qscale = max_qp;
will apply
thx
[...]
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