Hi Emanuel,
Makes sense that images are not compressed in zim file again, thanks for the clarification. In particular for windows mobile this increases the probability that with reducing the cluster size a sufficient performance is achieved (i.p. if there was a better way to display images than in android, but I haven't looked into this). For android I still expect that it it will be better to use a native library.
Christian Am 24.09.2011 14:30, schrieb Emmanuel Engelhart:
On 24/09/2011 14:24, Christian Pühringer wrote:
The JAVA liblzma performance is pretty bad: To increase efficiency of compression in the zim-format articles (and also all other data like images) are stored in clusters. Cluster size is apparently about 1 MB. This implies that loading an article which is stored at the end of a cluster involves decompressing the complete cluster.
Images should not be compressed in ZIM files for the obvious reasons they mainly are already compressed. This is the case for all ZIM files I made. As far as I know this is also the case for Mediawiki:Collection build ZIM files.
Emmanuel