Hello,
I created initial captions with fade ins and outs like this:
ffmpeg -i in.mov \
-framerate 24 -loop 1 -i a/01.png \
-framerate 24 -loop 1 -i a/02.png \
-framerate 24 -loop 1 -i a/03.png \
-framerate 24 -loop 1 -i a/04.png \
-framerate 24 -loop 1 -i a/05.png \
-framerate 24 -loop 1 -i a/06.png \
-framerate 24 -loop 1 -i a/07.png \
-framerate 24 -loop 1 -i a/08.png \
-framerate 24 -loop 1 -i a/09.png \
-filter_complex \
"[1:v]fade=in:0:d=0.2,fade=out:20:d=0.2[fad1]; \
[2:v]fade=in:28:d=0.2,fade=out:48:d=0.2[fad2]; \
[3:v]fade=in:56:d=0.2,fade=out:76:d=0.2[fad3]; \
[4:v]fade=in:84:d=0.2,fade=out:104:d=0.2[fad4]; \
[5:v]fade=in:112:d=0.2,fade=out:132:d=0.2[fad5]; \
[6:v]fade=in:140:d=0.2,fade=out:160:d=0.2[fad6]; \
[7:v]fade=in:168:d=0.2,fade=out:188:d=0.2[fad7]; \
[8:v]fade=in:196:d=0.2,fade=out:216:d=0.2[fad8]; \
[9:v]fade=in:224:d=0.2,fade=out:265:d=0.2[fad9]; \
[0:v][fad1]overlay=0:0:enable='between(t,0,1)'[tmp1]; \
[tmp1][fad2]overlay=0:0:enable='between(t,1.2,2.2)'[tmp2]; \
[tmp2][fad3]overlay=0:0:enable='between(t,2.4,3.4)'[tmp3]; \
[tmp3][fad4]overlay=0:0:enable='between(t,3.6,4.6)'[tmp4]; \
[tmp4][fad5]overlay=0:0:enable='between(t,4.8,5.8)'[tmp5]; \
[tmp5][fad6]overlay=0:0:enable='between(t,6, 7 )'[tmp6]; \
[tmp6][fad7]overlay=0:0:enable='between(t,7.2,8.2)'[tmp7]; \
[tmp7][fad8]overlay=0:0:enable='between(t,8.4,9.4)'[tmp8]; \
[tmp8][fad9]overlay=0:0:enable='between(t,9.6,11.2)'[tmp9]; \
[tmp9]ass=../subtitles.ass[outv]" \
-map [outv] -map a:0 \
-c libx264 -preset slow -profile:v high -crf 19 \
-strict -2 -c:a aac -b:a 192k \
-f mov -y out.mov
It encodes at 5.5 fps if I let it run for five minutes (the video is
almost two hours)
If I instead do:
ffmpeg -i in.mov \
-i a/01.png -i a/02.png -i a/03.png -i a/04.png -i a/05.png -i a/06.png -i
a/07.png -i a/08.png -i a/09.png \
-filter_complex \
"[0:v][1:v]overlay=0:0:enable='between(t,0,1)'[tmp1]; \
[tmp1][2:v]overlay=0:0:enable='between(t,1.2,2.2)'[tmp2]; \
[tmp2][3:v]overlay=0:0:enable='between(t,2.4,3.4)'[tmp3]; \
[tmp3][4:v]overlay=0:0:enable='between(t,3.6,4.6)'[tmp4]; \
[tmp4][5:v]overlay=0:0:enable='between(t,4.8,5.8)'[tmp5]; \
[tmp5][6:v]overlay=0:0:enable='between(t,6, 7 )'[tmp6]; \
[tmp6][7:v]overlay=0:0:enable='between(t,7.2,8.2)'[tmp7]; \
[tmp7][8:v]overlay=0:0:enable='between(t,8.4,9.4)'[tmp8]; \
[tmp8][9:v]overlay=0:0:enable='between(t,9.6,11.2)'[tmp9]; \
[tmp9]ass=../neposunute.ass[outv]" \
-map [outv] -map a:0 \
-c libx264 -preset slow -profile:v high -crf 19 \
-strict -2 -c:a aac -b:a 192k \
-f mov -y out.mov
It encodes in roughly 14 fps. But fade ins and outs occur only at the very
beginning (in the first 11 seconds), yet the slow down is preserved (I
also run the compilation for about five minuts). Is this a performance bug?
Regards,
Tomas
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