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2ff687c17f
When a Matroska Block is only stored in compressed form, the size of the uncompressed block is not explicitly coded and therefore not known before decompressing it. Therefore the demuxer uses a guess for the uncompressed size: The first guess is three times the compressed size and if this is not enough, it is repeatedly incremented by a factor of three. But when this happens with lzo, the decompression is neither resumed nor started again. Instead when av_lzo1x_decode indicates that x bytes of input data could not be decoded, because the output buffer is already full, the first (not the last) x bytes of the input buffer are resent for decoding in the next try; they overwrite already decoded data. This commit fixes this by instead restarting the decompression anew, just with a bigger buffer. This seems to be a regression since 935ec5a1. A FATE-test for this has been added. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>