Path: csiph.com!eternal-september.org!feeder.eternal-september.org!reader02.eternal-september.org!kreme.dont-email.me!.POSTED!not-for-mail From: Lewis Newsgroups: comp.sys.mac.apps,comp.sys.mac.system Subject: Re: Video Editing Date: Sat, 14 Nov 2020 18:46:07 -0000 (UTC) Organization: Miskatonic U Lines: 24 Message-ID: References: <1eNrH.550126$0W4.249829@fx42.iad> Reply-To: g.kreme@gmail.don-t-email-me.com Injection-Date: Sat, 14 Nov 2020 18:46:07 -0000 (UTC) Injection-Info: kreme.dont-email.me; posting-host="3adbca80f172146e5ddf22ea3072edc8"; logging-data="11887"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18nq1nMIqqYg6cJpBnuaROt" User-Agent: slrn/1.0.3 (Darwin) Cancel-Lock: sha1:DQV72F95w2bXYe0J6E47pz0XkBk= X-Face: )^b5"R:T7U>9~:PEn3YkzMfW*[b1qKeU.fP9C8~8HpU9}lA&6`bH1z X-Clacks-Overhead: GNU Terry Pratchett Mail-Copies-To: nobody Xref: csiph.com comp.sys.mac.apps:45632 comp.sys.mac.system:134908 In message JF Mezei wrote: > On 2020-11-14 10:35, Jolly Roger wrote: >> On 2020-11-14, JF Mezei wrote: >>> note: I have found that by using -vcodec h264 and -acodec ac3 or aac >>> with ffmpeg will used up mega CPU and is slower. >> >> That's because you are instructing ffmpeg to re-encode with those codecs >> rather than "-*codec copy" which streams the content as-is and is much >> faster as a result. > Opposite: I found that by forcing the re-encode, I got the output video > to start 100% OK at the time mark. When you don't do this via the > "copy", it starts to copy frame information at the right frane, but the > output video contains "out of context" compressed data for the first > frames because it doesn't start with a keyframe. This is because you don't know what you are doing. -- Up the airy mountains, down the rushy glen... From ghosties and bogles and long-leggity beasties... My mother said I never should... We dare not go a-hunting for fear... And things that go bump... Play with the fairies in the wood... --Lords and Ladies