[CinCV TNG] MPEG-2 native lossless editing without re-encoding

Terje J. Hanssen terje at nordland-teknikk.no
Wed Dec 28 19:50:52 CET 2016


Den 28. des. 2016 16:45, skrev Einar R√ľnkaru:
>
>
> On 12/28/2016 04:13 PM, Terje J. Hanssen wrote:
>> Maybe a stupid question, but can someone clarify what happends when
>> typical a source mepg2 video file is loaded into Cinelerra, on the time
>> line and available as a Media asset in Ressources?
>
> Cinelerra decodes frames needed to fill timeline and compositor. Then 
> it waits for user input.
>>
>> That is, does Cinelerra have (use) its own "internal format" for video
>> and audio, so that already after loading, the source file has been
>> decoded from the source mpeg2 ?
>
> Yes. The intened usage of Cinelerra is to modidify audio samples and 
> video pixels. One can control the internal format from 
> Preferences/Format.
>
>  And next to render this to the "same
>> mpeg2", is re-encode and/or passthrough used?
>
> When there are no edits, it is possible that cinelerra remuxes packets 
> from original file to the result. It happens automatically without 
> user control.
>>
>> Doing this with Cinelerra-gg 5.1 and "try FFmpeg first" mode set, the
>> Media info in Ressources say the file format is "FFMPEG" and list more
>> in the details.
>
> Never tried gg. My explanations are for CV. I dont know wether HV or 
> GG have this feature. It is removed from CVE.
>

Einar,

Thank you for throwing some light on this area.
If someone has more enlightment to add to this subject, it is welcome.

Terje J. H


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