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We cannot calculate the duration of vorbis packets even if we do know the
"minimal" frame_size. Originally committed as revision 13969 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@@ -538,12 +538,12 @@ static int get_audio_frame_size(AVCodecContext *enc, int size)
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{
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int frame_size;
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if(enc->codec_id == CODEC_ID_VORBIS)
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return -1;
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if (enc->frame_size <= 1) {
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int bits_per_sample = av_get_bits_per_sample(enc->codec_id);
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if(enc->codec_id == CODEC_ID_VORBIS)
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return -1;
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if (bits_per_sample) {
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if (enc->channels == 0)
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return -1;
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