image-processing - 裁剪后的ffmpeg psnr

Question

我正在尝试计算两个宽度/高度略有不同的图像的 PSNR:

ffmpeg -y -i /tmp/ff-021407597-sn-1029-516-C-0-956542137 
          -i /tmp/ff-021407597-ff-1029-516-C-0-362227908 
          -filter_complex "[0:v]crop=1028:514;[1:v]crop=1028:514" 
          -filter_complex "psnr"  %03d.png

这不起作用，我收到此错误:

Input #0, png_pipe, from

'/tmp/ff-021407597-sn-1029-516-C-0-956542137': Duration: N/A,

bitrate: N/A

Stream #0:0: Video: png, rgb24(pc), 1029x515, 25 tbr, 25 tbn, 25 tbc Input #1, png_pipe, from

'/tmp/ff-021407597-ff-1029-516-C-0-362227908': Duration: N/A,

bitrate: N/A

Stream #1:0: Video: png, rgb24(pc), 1029x516, 25 tbr, 25 tbn, 25 tbc Cannot find a matching stream for unlabeled input pad 0 on filter

Parsed_psnr_0

有没有办法映射裁剪过滤器的输出，以便将其传递到 psnr 过滤器？

Answer 1

利用

ffmpeg -y -i /tmp/ff-021407597-sn-1029-516-C-0-956542137 
          -i /tmp/ff-021407597-ff-1029-516-C-0-362227908 
          -filter_complex "[0:v]crop=1028:514[a];[1:v]crop=1028:514[b];[a][b]psnr" -f null -