[MPlayer-users] Trouble with Mp3 audio in MP4 containers

[The Wanderer]

On 12/21/2005 07:17 AM, WireSpot wrote:

> On 12/20/05, The Wanderer <inverseparadox at comcast.net> wrote:
> 
>> On 12/20/2005 01:16 PM, WireSpot wrote:
>> 
>>> And the A/V was still off so I had to tweak it some more.
>> 
>> Hmm. That I haven't encountered; the playback is perfect for me
>> once I supply those three options. Off in what way, exactly?
> 
> The sync, I mean. You know what happens when the fps is off... The
> values you gave didn't work perfectly, should've expected that, after
> all you gave values for your own files. May even vary from file to
> file and it's hell to try to adjust the fps by hand and you never end
> up with quite perfect sync. I hate doing it for subs and I hate even
> more having to do it for A/V. It's a tedious business.

I know you meant that the A/V sync was off. I meant, in what way is it
"off"?

Are the MP4 files you're having to deal with the ones being released by
Kaizoku-Fansubs? (If not, I'd be interested to know who else is using
the same software, since I haven't been able to get K-F to talk to me
about how they create their files.)

When I play the AVI files released by K-F, *or* the AVI files I get by
streamcopying the video and transcoding the audio of the MP4 files (but
*not* the MP4 files themselves), the audio comes slightly too late,
perhaps by as much as half a second - but it is *consistently* so, and
once I adjust the delay factor appropriately the problem disappears. (I
do have other AVI files whose sync drifts all over the place, but that
appears to be a problem in the creation of the particular files rather
than a problem with the player as such.)

I would count myself rather surprised if the true intended frame rate of
the files was neither 30000/1001 nor 24000/1001, since those are the
values used by the vast majority of things out there (at least within
the realms to which I've paid any attention). In any case, unless I'm
much mistaken, fps should have nothing to do with A/V sync; the sync or
desync should remain the same regardless, it's just that the video and
audio will be played at a different speed.

...somehow it feels like I've left out at least one important comment
and/or question, but I'm not sure what it might be.

-- 
       The Wanderer

Warning: Simply because I argue an issue does not mean I agree with any
side of it.

Secrecy is the beginning of tyranny.