Re: [Mlt-devel] removing parts of mp4

[Carl K. <ca...@pe...>]

On Tue, Mar 26, 2013 at 7:55 AM, Brian Matherly <pez...@ya...> wrote:
>> I need to touch up some videos I made with:
>
>>
>> melt -verbose -progress -profile dv_ntsc test.mlt -consumer
>> avformat:test.mp4 threads=2 progressive=1 properties=x264-medium
>> vb=1024k acodec=libmp3lame ab=128k
>>
>> I don't have the sources listed in test.mlt (they are in a truck being
>> shipped, eta friday)
>>
>> So starting with test.mp4 which was encoded using the above
>> parameters, what is a good way to remove some dead air?
>>
>> The two I need so far:
>> 1. cut the last 10 min off  cut out from  0:30:36 to the end
>> 2. remove from 0:50:14 - 0:55:06
>>
>> mplayer -identify says
>> ID_VIDEO_FPS=29.970
>>
>> I am good using that to calc in/out frames if I need to, but doesn't
>> melt now take h:m:s for in/out ?
>
> in/out are in units of frames. So just calculate the number of frames for your in/out points. I assume your timecodes above are in HH:MM:SS format.
>
> For #1 above:
>    ( ( 30 x 60 ) + 36 ) x 29.97 = 55024
> So you would run:
>    melt test.mp4 out=55024 -consumer avformat:test2.mp4
>
> For #2 above:
>    ( ( 50 x 60 ) + 14 ) x 29.97 = 90329
>    ( ( 55 x 60  ) + 6 ) x 29.97 = 99080
> So you would run:
>    melt test.mp4 out=90329 test.mp4 in=99080 -consumer avformat:test2.mp4
>

Thanks.

Carl K