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

JCA 1.41421 at gmail.com
Wed Dec 28 20:15:51 CET 2016


Does this mean that Cinelerra can do frame-accurate editing of mpeg2 video
without re-encoding? What about x.264 video?

On Wed, Dec 28, 2016 at 8:45 AM, Einar R√ľnkaru <einarrunkaru at gmail.com>
wrote:

>
>
> 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
>
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