[FFmpeg-devel] [FFmpeg-devel-irc] IRC log for 2010-03-28

[Baptiste Coudurier]

On 03/30/2010 07:16 PM, M?ns Rullg?rd wrote:
> Baptiste Coudurier<baptiste.coudurier at gmail.com>  writes:
>
>> On 03/30/2010 07:11 PM, M?ns Rullg?rd wrote:
>>> Alexander Strange<astrange at ithinksw.com>   writes:
>>>
>>>> There are some streamcopy bugs (copying audio from flv to mp3
>>>> failing with non-monotone timestamps when mp3 can't have timestamps
>>>> anyway) reported but not fixed, it might be discouraging more. Of
>>>> course, I never managed to look into them myself...
>>>
>>> Streamcopy of anything out of mkv always fails in the same way.
>>> Trivially hacked up tools to simply dump packets to a file do the
>>> right thing...
>>
>> That is just false. It fails in some specific cases, and only with
>> H.264 and B-pyramid AFAIK.
>
> I guess those specific cases are all mkv files on my hard disk.  And
> in "anything" I also include audio.

What codec ?

The problem with mkv is that it doesn't contain dts, to remux to mp4, 
you _absolutely_ need dts. To compute correct dts you need the correct 
delay.

Then you have mkv storing timestamps per block, you have to interpolate 
the timestamps per frame to remux it to mp4 by example.

Don't imply "streamcopying" _online_ is easy as saying it, please.
Offline is _easier_ but is also not realistic when dealing with huge files.

> Also, please keep discussions on-list.

Yes, sorry about that.

-- 
Baptiste COUDURIER
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