2017-04-10 7:16 GMT+10:00 bowljoman <[email protected]>: > > sorry if this client top posts, but to answer, you can do 1 of 2 things. > assume it is different and insert it before returning to the unprocessed > clip. or you can check if they are different by doing a comparison. > > > Thanks for your suggestion. Let's say if original H.264 video stream has AVCC bitstream, no matter you encode 1st part with Annex-b or AVCC, as long as it's different from orginal format, I won't be able to do codec copy using readpacket/writepacket, right?
Thanks > Sent from my T-Mobile 4G LTE Device > > -------- Original message -------- > From: YIRAN LI <[email protected]> > Date: 4/7/17 3:15 PM (GMT-08:00) > To: "This list is about using libavcodec, libavformat, libavutil, > libavdevice and libavfilter." <[email protected]>, FFmpeg user > questions <[email protected]> > Subject: [Libav-user] re-encoding and transcode (codec copy) on same file. > > Hi guys, > > I'm investigating if it's possible to do editing and transcode on same > file. > > I mean use -vcodec copy, we can readout packets and write them directly > into output file without re-encoding. But if it's possible, for example if > I have a 2 mins video, re-encode 1st min because there're some effects > applied to that region but copy 2nd part? > > My concern is, for example we know H.264 has extradata, if I re-encode > first part but keep 2nd part, how if new extradata is different from old > extradta? > > Anyone have suggestion on this? and any other possible problems doing this? > > Thanks > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > >
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