ffmpeg: fix negative array index

Fixes CID733808 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
13 years ago · c3778df2d4
parent 6182e0a6f6
commit c3778df2d4
1 changed files with 2 additions and 1 deletions
--- a/ffmpeg_filter.c
+++ b/ffmpeg_filter.c
@ -37,7 +37,8 @@ enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFo
 {
    if (codec && codec->pix_fmts) {
        const enum AVPixelFormat *p = codec->pix_fmts;
-        int has_alpha= av_pix_fmt_desc_get(target)->nb_components % 2 == 0;
+        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
+        int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
        enum AVPixelFormat best= AV_PIX_FMT_NONE;
        if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
            if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {