ffmpeg - 用不同颜色覆盖多个褪色文本

Question

我对这个 ffmpeg 命令有疑问，如果褪色文本为白色字体颜色，它可以正常工作，但如果我将字体颜色更改为其他颜色(例如黑色)，褪色文本将不会出现，有什么想法吗？

ffmpeg -i ./based_video/480/clip3.mp4 -filter_complex "color=black:100x100[c]; [c][0]scale2ref[ct][mv0]; \
[ct]setsar=1,split=3[t1][t2][t3]; \
[t1]drawtext=fontfile=/usr/share/fonts/truetype/roboto/Roboto-Bold.ttf:text='\$30,000.0':fontsize=40:fontcolor=white,split[text1][alpha1]; \
[text1][alpha1]alphamerge,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=5:d=1:alpha=1[txta1]; \
[t2]drawtext=fontfile=/usr/share/fonts/truetype/roboto/Roboto-Bold.ttf:text='\$30,000.0':fontsize=40:fontcolor=white,split[text2][alpha2]; \
[text2][alpha2]alphamerge,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=5:d=1:alpha=1[txta2]; \
[t3]drawtext=fontfile=/usr/share/fonts/truetype/roboto/Roboto-Bold.ttf:text='\$30,000.0':fontsize=40:fontcolor=white,split[text3][alpha3]; \
[text3][alpha3]alphamerge,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=5:d=1:alpha=1[txta3]; \
[mv0][txta1]overlay=x='100':y='200':shortest=1[mv1]; \
[mv1][txta2]overlay=x='300':y='200':shortest=1[mv2]; \
[mv2][txta3]overlay=x='500':y='200':shortest=1" \
-c:v libx264 -c:a copy ./output_video/testnew-clip3-output.mp4

完整日志在这里:
https://docs.google.com/document/d/1y9Dnn0Df75J8P_hZ6LjHTX2dk-8z97UnTjlX8dnc0v0/edit?usp=sharing

提前致谢

Answer 1

您正在使用绘制的文本作为 alpha 来馈送飞机。如果文本为黑色，则 alpha 为黑色，因此文本不会出现。您可以完全跳过 alpha 创建和合并。

ffmpeg -i ./based_video/480/clip3.mp4 -filter_complex "color=black@0:100x100,format=yuva444p[c]; [c][0]scale2ref[ct][mv0]; \
[ct]setsar=1,split=3[t1][t2][t3]; \
[t1]drawtext=fontfile=/usr/share/fonts/truetype/roboto/Roboto-Bold.ttf:text='\$30,000.0':fontsize=40:fontcolor=white,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=5:d=1:alpha=1[txta1]; \
[t2]drawtext=fontfile=/usr/share/fonts/truetype/roboto/Roboto-Bold.ttf:text='\$30,000.0':fontsize=40:fontcolor=white,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=5:d=1:alpha=1[txta2]; \
[t3]drawtext=fontfile=/usr/share/fonts/truetype/roboto/Roboto-Bold.ttf:text='\$30,000.0':fontsize=40:fontcolor=white,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=5:d=1:alpha=1[txta3]; \
[mv0][txta1]overlay=x='100':y='200':shortest=1[mv1]; \
[mv1][txta2]overlay=x='300':y='200':shortest=1[mv2]; \
[mv2][txta3]overlay=x='500':y='200':shortest=1" \
-c:v libx264 -c:a copy ./output_video/testnew-clip3-output.mp4