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fix block_align for mp3 stream copy

Originally committed as revision 9880 to svn://svn.ffmpeg.org/ffmpeg/trunk

Michael Niedermayer authored on 2007/08/04 08:23:42
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@@ -1527,6 +1527,8 @@ static int av_encode(AVFormatContext **output_files,
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                 codec->channels = icodec->channels;
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                 codec->frame_size = icodec->frame_size;
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                 codec->block_align= icodec->block_align;
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+                if(codec->block_align == 1 && codec->codec_id == CODEC_ID_MP3)
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+                    codec->block_align= 0;
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                 break;
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             case CODEC_TYPE_VIDEO:
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                 if(using_vhook) {