On Mon, Jul 4, 2022 at 11:30 PM Michael Koch <[email protected]> wrote:
> Am 04.07.2022 um 18:46 schrieb Cecil Westerhof via ffmpeg-user: > > Paul B Mahol <[email protected]> writes: > > > >> On Mon, Jul 4, 2022 at 6:15 PM Cecil Westerhof via ffmpeg-user < > >> [email protected]> wrote: > >> > >>> Some time ago I was experimenting with xfade. I wanted to know how to > >>> use several in one run. Now I really needed it, so I did some digging > >>> and found this: > >>> ffmpeg -y \ > >>> -i input0.mkv \ > >>> -i input1.mkv \ > >>> -i input2.mkv \ > >>> -i input3.mkv \ > >>> -i input4.mkv \ > >>> -i input5.mkv \ > >>> -i input6.mkv \ > >>> -i input7.mkv \ > >>> -i input8.mkv \ > >>> -i input9.mkv \ > >>> -vcodec libx264 \ > >>> -crf 26 \ > >>> -preset veryfast \ > >>> -filter_complex " > >>> [0:a][1:a] acrossfade=d=4[a1]; > >>> [0:v][1:v] xfade=transition=hlslice: > >>> duration=4: > >>> offset=308[v1]; > >>> > >>> [a1][2:a] acrossfade=d=4[a2]; > >>> [v1][2:v] xfade=transition=vertopen: > >>> duration=4: > >>> offset=357[v2]; > >>> > >>> [a2][3:a] acrossfade=d=4[a3]; > >>> [v2][3:v] xfade=transition=circlecrop: > >>> duration=4: > >>> offset=533[v3]; > >>> > >>> [a3][4:a] acrossfade=d=4[a4]; > >>> [v3][4:v] xfade=transition=rectcrop: > >>> duration=4: > >>> offset=1016[v4]; > >>> > >>> [a4][5:a] acrossfade=d=4[a5]; > >>> [v4][5:v] xfade=transition=slideup: > >>> duration=4: > >>> offset=1158[v5]; > >>> > >>> [a5][6:a] acrossfade=d=4[a6]; > >>> [v5][6:v] xfade=transition=wiperight: > >>> duration=4: > >>> offset=1473[v6]; > >>> > >>> [a6][7:a] acrossfade=d=4[a7]; > >>> [v6][7:v] xfade=transition=horzclose: > >>> duration=4: > >>> offset=1661[v7]; > >>> > >>> [a7][8:a] acrossfade=d=4[a8]; > >>> [v7][8:v] xfade=transition=diagbl: > >>> duration=4: > >>> offset=2082[v8]; > >>> > >>> [a8][9:a] acrossfade=d=4[a9]; > >>> [v8][9:v] xfade=transition=slideright: > >>> duration=4: > >>> offset=2211[v9] > >>> " \ > >>> -map '[v9]' -map '[a9]' \ > >>> output.mkv > >>> > >>> I hope there are better ways, because there are some problems with it. > >>> For example it needs a lot of memory. (24 GB) > >>> > >> Could use (a)movie filters and only use such filter when actually > needed in > >> graph. > > I am concerning ffmpeg still a newbie. What do you mean by this? > > > > I also didn't understand it. > Before each new input to xfade use movie filter to set input file. Similar for audio. Your current solution is problematic because it starts decoding everything from start and that used lots of memory to keep timestamps in sync when they are not really needed. > > Michael > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
