如何使ffmpeg drawtext持续时间适用于图像幻灯片显示？

debugcn 发表于 Dev

kostya572

我有可用的代码从具有一些淡入淡出效果的图像创建视频幻灯片放映：

ffmpeg -video_size 1280x720 \
-loop 1 -t 2.5 -i ok/image-1.jpg \
-loop 1 -t 2.5 -i ok/image-2.jpg \
-loop 1 -t 2.5 -i ok/image-3.jpg \
-loop 1 -t 2.5 -i ok/image-4.jpg \
-loop 1 -t 2.5 -i ok/image-5.jpg \
-filter_complex \
"[0:v]fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[pre]; \
 [0:v]drawtext=enable='between(t,0,5)':fontfile=/Library/Fonts/Arial.ttf:text='FIRST TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th[top0]; \
 [1:v][0:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b1v]; \
 [1:v]drawtext='between(t,5,10)':fontfile=/Library/Fonts/Arial.ttf:text='SECOND TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th[top1]; \
 [2:v][1:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b2v]; \
 [2:v]drawtext='between(t,10,15)':fontfile=/Library/Fonts/Arial.ttf:text='THIRD TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th[top2]; \
 [3:v][2:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b3v]; \
 [3:v]drawtext='between(t,15,20)':fontfile=/Library/Fonts/Arial.ttf:text='FOURTH TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th[top3]; \
 [4:v][3:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b4v]; \
 [4:v]drawtext='between(t,20,25)':fontfile=/Library/Fonts/Arial.ttf:text='FIFTH TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th[top4]; \
[pre][top0][0:v][b1v][top1][1:v][b2v][top2][2:v][b3v][top3][3:v][b4v][top4][4:v]concat=n=15:v=1:a=0,format=yuv420p[v]" -map "[v]" out.mp4

如何使“ FIRST TEXT”与第一张幻灯片“ ok / image-1.jpg”显示全部5秒钟？现在只显示约2秒钟，然后隐藏。还可以显示第一张幻灯片“ ok / image-1.jpg”的多个文本吗？

enable='between(t,0,5) 在所有5秒钟内都不工作。

吉安

尝试

ffmpeg \
-loop 1 -t 6 -i ok/image-1.jpg \
-loop 1 -t 5 -i ok/image-2.jpg \
-loop 1 -t 5 -i ok/image-3.jpg \
-loop 1 -t 5 -i ok/image-4.jpg \
-loop 1 -t 5 -i ok/image-5.jpg \
-filter_complex \
"[0:v]drawtext=fontfile=/Library/Fonts/Arial.ttf:text='FIRST TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th,drawtext=fontfile=/Library/Fonts/Arial.ttf:text='AFTER FIRST TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th+100,split[pre][pbv0];[pbv0]fifo[bv0]; \
 [pre]fade=t=in:st=0:d=1[v0]; \
 [1:v]drawtext=fontfile=/Library/Fonts/Arial.ttf:text='SECOND TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th,split=3[pbv1a][pbv1b][v1];[pbv1a]fifo[bv1a];[pbv1b]fifo[bv1b]; \
 [2:v]drawtext=fontfile=/Library/Fonts/Arial.ttf:text='THIRD TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th,split=3[pbv2a][pbv2b][v2];[pbv2a]fifo[bv2a];[pbv2b]fifo[bv2b];\
 [3:v]drawtext=fontfile=/Library/Fonts/Arial.ttf:text='FOURTH TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th,split=3[pbv3a][pbv3b][v3];[pbv3a]fifo[bv3a];[pbv3b]fifo[bv3b]; \
 [4:v]drawtext=fontfile=/Library/Fonts/Arial.ttf:text='FIFTH TEXT':fontcolor=white:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th,split[pbv4][v4];[pbv4]fifo[bv4]; \
 [bv1a][bv0]blend=all_expr='A*T/0.5+B*(0.5-T)/0.5',trim=0:0.5[01v]; \
 [bv2a][bv1b]blend=all_expr='A*T/0.5+B*(0.5-T)/0.5',trim=0:0.5[12v]; \
 [bv3a][bv2b]blend=all_expr='A*T/0.5+B*(0.5-T)/0.5',trim=0:0.5[23v]; \
 [bv4][bv3b]blend=all_expr='A*T/0.5+B*(0.5-T)/0.5',trim=0:0.5[34v]; \
 [v0][01v][v1][12v][v2][23v][v3][34v][v4]concat=n=9,format=yuv420p[v]" -map "[v]" out.mp4

我假设您希望在淡入淡出期间显示文本。因此，我已经重新调整了您的命令。应首先应用所有抽签，然后将这些输出混合。

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