[CinCV TNG] [PATCH] Removed can_copy_from from file* sources

Andrew Randrianasulu randrianasulu at gmail.com
Sat Jul 15 17:05:00 CEST 2017


В сообщении от Saturday 15 July 2017 17:40:36 Einar Rc3bcnkaru написал(а):
> On 07/15/2017 08:38 AM, igor_ubuntu wrote:
> > 2017-07-14 23:48 GMT+03:00 Johannes Sixt <j6t at kdbg.org
> > <mailto:j6t at kdbg.org>>:
> >
> >
> >     For example, when your *source is DV and you render DV*, then a DV
> >     frame can be copied without decoding and encoding it (provided that
> >     no changes, such as effects, are applied, of course).
>
> Direct copy works when there is 1 video track, no effects, input and
> output have the same size, input and output media is all I-frames.
>
> DV - DV, PNG - PNG, TIFF - TIFF work.

Can it be extended  to work with mjpeg, DNxHD, I-frames only mpeg2 , ffv1, and 
alikes ?

https://en.wikipedia.org/wiki/DNxHD
--------
DNxHD support is included in stable version 0.5 of FFmpeg, released on March 10, 
2009.[9][10] This allows Linux non-linear video editors Cinelerra and Kdenlive 
to use DNxHD.
---------

I personally never used  workflow with reencoded source videos  due to extreme 
lack of free space, but at least old versions of Cinelerra  often had no option 
but to run on reencoded material, and having no hdd space for video editing is 
more like deviation, not norm ....


>
> DV and PNG can be packed to MOV (according to current sources)
>
> The possibility of direct copy is decided frame by frame.
>
> > You mean the menu File->Render ? i.e. export from CV ? But cinelerra
> > does not have the option 'smart copy' as in Avidemux.
>
> User has no control over the feature. The workaround to disable the
> feature is to apply an arbitary effect to the whole track.
>
> > Einar says that there are noticeable differences between directly copied
> > and decoded/encoded areas.
>
> These reports were sent a long time ago. Currently nobody wants to
> encode there video to dv or png lists. Everybody wants h264 or something
> more sophisticated - then direct copy is impossible.
>
> The question is why it is bad to remove the feature that can be used
> only with obsoleted formats?
>
> For me it means, that I need to have test cases and test direct copy
> after every major change. I am not interested in it. I do not see real
> usage of the feature as it is.
>
> Einar
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