On Sun, Feb 11, 2024 at 8:54 PM Vincent Deconinck <vdeconi...@gmail.com> wrote:
> Hi, > > I will probably get flamed because I'm for jumping into this conversation > while being a complete newbie :-), but I think nobody replied with an > answer to Mark's question "why". > > All I know is the ffmpeg page on seeking - > https://trac.ffmpeg.org/wiki/Seeking - ends with a paragraph saying: > "Using -ss as input/output option *together with -c:v copy might not be > accurate* since ffmpeg is forced to only use/split on i-frames" (emphasis > mine) > The page also states that: > "As of FFmpeg 2.1, when transcoding with ffmpeg (*i.e. not stream > copying*), > -ss is now also "frame-accurate" even when used as an input option" > My understanding is thus that with input seeking, the requested start time > will not be satisfied without transcoding; while with output seeking, the > requested start time will always be guaranteed correct, even with -c copy. > > Yes, but "frame-accurate" (and if no bugs exist) is very slow when seeking away from start of video. But I might be wrong ;-) > > Peace. > > Vincent > > On Sun, Feb 11, 2024 at 8:29 PM Paul B Mahol <one...@gmail.com> wrote: > > > On Sun, Feb 11, 2024 at 7:12 PM Mark Filipak <markfilipak.i...@gmail.com > > > > wrote: > > > > > On 11/02/2024 13.09, Bouke / Videotoolshed wrote: > > > > So do you, so why ask the question? > > > > Now go away! > > > > > > I do not know the answer. > > > > > > > In most cases you will get in most times different results for those 2 > > variants. > > > > Only for perfect containers and perfect implementations it will give same > > result in every case. > > For last one I do not have any example ffmpeg command to show you. (And > I'm > > not sure if it even exist) > > > > > > > > > > _______________________________________________ > > > ffmpeg-user mailing list > > > ffmpeg-user@ffmpeg.org > > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > > > To unsubscribe, visit link above, or email > > > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > > > > > _______________________________________________ > > ffmpeg-user mailing list > > ffmpeg-user@ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
