On 16 Sep 2015, at 12:39, Robert Krüger <[email protected]> wrote:
> On Wed, Sep 16, 2015 at 12:26 PM, Henk D. Schoneveld <[email protected]> > wrote: > >> >> On 16 Sep 2015, at 11:33, [email protected] wrote: >> >>> Hello, >>> >>> I'm trying to cut a video to get 12s sequences. It needs to be accurate. >> Cutting is done on begin and end of a Group Of Pictures, a GOP. >> Splitting always occurs the way you mention, it is ‘about 12 seconds’ >> What is, could be the reason, you need it absoute accurate ? >> One way around could be to 1st encode your source to all I-frame, key >> frames. This way you get a GOP-size of 1 > > > That's not necessary. AFAIR ffmpeg will subclip accurately also for > non-i-frame-only codecs when transcoding the video. So if your aoutput is > not supposed to be i-frame-only (which is probably not the case), you would > have an unneeded encoding step (and thus quality loss), unless your > intermediate format is lossless of course. So, should it not suffice to > replace copy by a re-encoding, you could do that as a workaround (i.e. > transcode to ffv1-iframe-only and then segment that) but as I said, it > should not be required. I don’t see the difference, although I didn’t explicitly mention that this is done in 1 step. > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
