[MPlayer-DOCS] Interested in contributing case studies

[Jeff Clagg]

On Fri, Oct 20, 2006 at 11:26:03PM -0400, Mark Pilgrim wrote:

> Did we come to a decision on mp4creator vs. MP4Box?

I don't see any reason why it's harmful to use mp4creator in this
example. But my own tiny sample suggests that all Windows users are
using MP4Box, and most Linux users are too. Not necessarily a huge deal
either way, I think.

> +  <application>QuickTime</application> 7 does not support 8x8 DCT macroblocks,
> +  so you must specify <option>-x264encopts no8x8dct</option>.  This
> +  means that <option>i8x8</option> will have no effect, since it
> +  requires <option>8x8dct</option>.

You don't have to specify no8x8dct since it's default. This is something
I feel fairly strongly about since history shows that canned command
lines often get copy+pasted by literally thousands of people and this
WILL confuse people about what the defaults are.

Just tell the user not to put 8x8dct in their options.

> +  You are now ready to encode the video.  Since you care about
> +  quality, of course you will be doing a two-pass encode.  To shave off
> +  some encoding time, you can specify the <option>turbo</option> option
> +  on the first pass; this reduces <option>subq</option> and
> +  <option>frameref</option> to 1.  To save some disk space, you can
> +  use the <option>ss</option> option to strip off the first few seconds
> +  of the video.  (I found that this particular movie has 32 seconds of
> +  credits and logos.)  The <option>no8x8dct</option> option
> +  is required for <application>QuickTime</application> 7 compatibility,
> +  and <option>bframes</option> can be 0 or 1.  The other options are
> +  documented in <link

(another no8x8dct mention)

> +  linkend="menc-feat-x264-encoding-options-speedvquality">Encoding with
> +  the <systemitem class="library">x264</systemitem> codec</link> and
> +  the man page.
> +
> +  <screen>mencoder dvd://1 -o /dev/null -ss 32 -ovc x264 \
> +-x264encopts pass=1:turbo:bitrate=900:no8x8dct:bframes=1:\

(another)

> +
> +<para>
> +  The second pass is the same, except that you specify
> +  <option>pass=2</option> and remove the <option>turbo</option> option.
> +
> +  <screen>mencoder dvd://1 -o narnia.avi -ss 32 -ovc x264 \
> +-x264encopts pass=2:bitrate=900:frameref=5:no8x8dct:bframes=1:\

(another)