[FFmpeg-devel] [PATCH] speeding up qt-faststart

[Michael Niedermayer]

On Sun, Sep 30, 2012 at 07:57:52PM +0200, Jan Ehrhardt wrote:
> 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'.
> 
> S:\SD_VIDEO\PRG001>e:\utils\qt-faststart 00005.mp4 5.mp4
> ftyp          0 32
> free         32 8
> mdat         40 13744391
> moov   13744431 141848
>  patching stco atom...
>  patching stco atom...
>  writing ftyp atom...
>  writing moov atom...
>  copying rest of file...
> 
> Execution time: 1576.259 s
> 
> S:\SD_VIDEO\PRG001>s:\utils\qt-faststart 00005.mp4 5.mp4
> ftyp          0 32
> free         32 8
> mdat         40 13744391
> moov   13744431 141848
>  patching stco atom...
>  patching stco atom...
>  writing ftyp atom...
>  writing moov atom...
>  copying rest of file...
> 
> Execution time: 3.846 s
> 
> Changes to qt-faststart.c are below. c is not ny native language,
> so could somebody check the diff and commit it?

you forgot a free() and its better not to allocate more than needed
ive fixed them and applied the patch

thanks

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

He who knows, does not speak. He who speaks, does not know. -- Lao Tsu
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