[MEncoder-users] Encoding movies with DTS tracks

[belcampo]

Grozdan wrote:
> 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.
Maybe reading this thread does explain it/or something DUNNO
[FFmpeg-devel] Problem with initial dts in h264
> 
>> Thanks,
>>
>> Olivier
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