[MEncoder-users] Encoding movies with DTS tracks

[Grozdan]

On Mon, Dec 7, 2009 at 11:49 AM, Olivier Rolland
<billl at users.sourceforge.net> wrote:
> On Sun, Dec 6, 2009 at 9:06 PM, RC <cooleyr at gmail.com> wrote:
>> On Fri, 4 Dec 2009 07:33:38 +0100
>> Olivier Rolland <billl at users.sourceforge.net> wrote:
>>
>>> What am I doing wrong ?
>>
>> Using -mc 0 without understanding what it does...
>
> Probably not as much as you do. Anyway here is what the doc says:
>
> MEncoder's audio/video synchronization algorithms were designed with
> the intention of recovering files with broken sync. However, in some
> cases they can cause unnecessary skipping and duplication of frames,
> and possibly slight A/V desync, when used with proper input (of
> course, A/V sync issues apply only if you process or copy the audio
> track while transcoding the video, which is strongly encouraged).
> Therefore, you may have to switch to basic A/V sync with the -mc 0
> option, or put this in your ~/.mplayer/mencoder config file, as long
> as you are only working with good sources (DVD, TV capture, high
> quality MPEG-4 rips, etc) and not broken ASF/RM/MOV files.
>
> AFAICT, a DVD is a good source so I guess I can use -mc 0 to prevent
> unnecessary skipping, duplication of frames and slight A/V desync.
>
> Are you saying that -mc 0 should never be used ? Or that it should be
> used only if there was unnecessary skipping, duplication, ... ? Or
> that it shouldn't be used with DTS tracks ?

My experience is that -mc 0, even on "good" sources, increases the
chance of a/v desync much much more than mencoder's default sync
system. I've kinda always had problems with mencoder + dts audio,
especially when copying it. I don't deal much with dts, but whenever I
do, the chance is very high that I'll have some problems, either frame
skipping or desync and -mc 0 has never been able to fix it for me.

>
> Thanks,
>
> Olivier
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