[FFmpeg-soc] [soc]: r530 - matroska/matroskaenc.c

Michael Niedermayer michaelni at gmx.at
Thu Jul 26 02:46:24 CEST 2007


On Thu, Jul 26, 2007 at 02:05:30AM +0200, conrad wrote:
> Author: conrad
> Date: Thu Jul 26 02:05:30 2007
> New Revision: 530
> Log:
> Write the creation time
> @@ -526,6 +538,7 @@ static int mkv_write_header(AVFormatCont
>      if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
>          put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
>          put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
> +        put_ebml_date  (pb, MATROSKA_ID_DATEUTC   , av_gettime()     );
>      }

storing the creation time in a file without the users knowledge is a security
an example would be a journalist who recorded a film of some officials in
[put your favorite dictatorship here] killing/tourturing some people 
and encodes that and stores it in a mkv and then uploads it somewhere
knowing the time when the mkv was created is a large part of whats needed for
the officials to identify and eliminate him (the missing part is where the
encoding happened and who was there at that time or even just where was
suspect X at that time ...)


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Asymptotically faster algorithms should always be preferred if you have
asymptotical amounts of data
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