Make truncated mpeg4 GOP header check a bit more specific.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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				@ -1495,7 +1495,7 @@ end:
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static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
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    int hours, minutes, seconds;
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    if(!show_bits(gb, 18)){
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    if(!show_bits(gb, 23)){
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        av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
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        return -1;
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    }
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