[MEncoder-users] adding harddup's after the fact...

[Jarred Nicholls]

On Tue, Dec 15, 2009 at 9:09 AM, Josh Sharpe <josh.m.sharpe at gmail.com>wrote:

> Do I use that with -ovc copy ? Eg:
>
> Mencider -ovc copy -mc 0 -opfs 29.97 -oac copy -o new.avi old.avi
>

Yes you can.  Example:

mencoder -ovc copy -oac faac -faacopts br=192 -srate 44100 -of lavf -o
IMG_0018.mp4 -vf harddup -mc 0 IMG_0018.MOV

In that example I'm copying my original h.264 video but re-encoding the
audio to AAC.  If just '-mc 0' doesn't work by itself, and you know what the
output FPS is "suppose" to be, then specify '-ofps' as well (some input
formats have variable frame rate which mencoder doesn't understand
sometimes, but usually just copying the video stream doesn't require -ofps).
 Try without -ofps first.

On a side note, when you specify -ofps and you want 29.97, use the
fractional version instead, i.e., '-ofps 30000/1001'.

Jarred


>
> Sent from my iPhone, which is cooler than your iPhone.
>
>
> On Dec 15, 2009, at 8:21 AM, Jarred Nicholls <jarred.nicholls at gmail.com>
> wrote:
>
>
>>
>> On Dec 15, 2009, at 2:54 AM, Josh Sharpe <josh.m.sharpe at gmail.com> wrote:
>>
>>  So basically I encoded an mpeg stream without '-vf harddup' and am
>>> regretting it.  The file is in an AVI with h264 video and ac3 audio and
>>> I'm
>>> trying to convert it to mp4/264/aac (so I can play it in quicktime).
>>>
>>> I've managed go get everything dumped, re-encoded and remuxed the way I
>>> want, but I have a sync issue.  The video is going much faster than the
>>> audio.  (Is this because all of those 0-byte frames got dropped when the
>>> remuxing occured??)
>>>
>>> So, my original AVI file plays fine, which tells me that those 0-byte
>>> 'duplicate' frames must be sitting there acting like duplicates, waiting
>>> to
>>> be blown away by the resmuxer and screwing me over...  Is there any way I
>>> can convert all of those fake duplicate frames to hard dups **without
>>> re-encoding the video** so that when I do dump and remux them that the
>>> sync
>>> issue doesn't happen?
>>>
>>> Does that all make sense?
>>>
>>> Thanks!
>>>
>>
>> Use harddup always and try with '-mc 0'.  Also specify your output fps
>> '-ofps'.   That should work if your original AVI is in sync.
>>
>> Jarred
>>
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