On Fri, 28 Feb 2014, Martin Storsjö wrote:
On Thu, 27 Feb 2014, [email protected] wrote:
From: Jan Ehrhardt <[email protected]>
qt-faststart is terribly slow when the input file and the output file
are on a slow disk like a SD card. By increasing the copy_buffer from
1K to 32M I decreased the processing time on a sample file from
1600 seconds to 4 seconds. The timing difference is during 'copying
rest of file'.
I explicitly tested this, on an SD card, on a windows 8.1 laptop, and
there was no measurable speedup by this patch - running through a 23 MB
mp4 file with qt-faststart took around 2 seconds both before and after
this patch.
I recall reading something related to the original submission of this
patch that it was in an environment where all caching was manually
disabled - which IMO is quite a significant detail wrt to the patch.
Still, the default block size can surely be increased from 1 KB to
something slightly bigger though.
// Martin
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