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ogg: Do not try to use the parser if it is not present
Bug-Id: 886 CC: libav-stable@libav.org
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@ -364,6 +364,9 @@ static int vorbis_packet(AVFormatContext *s, int idx)
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struct oggvorbis_private *priv = os->private;
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int duration;
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if (!priv->vp)
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return AVERROR_INVALIDDATA;
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/* first packet handling
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* here we parse the duration of each packet in the first page and compare
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* the total duration to the page granule to find the encoder delay and
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