Im trying to scale a video so that it is always 512 wide where the height changes in proportion to the original video. Once scaled, I then want to apply a watermark/overlay to the video, therefore the video will scale but the watermark wont.
我试着在一个视频上缩放，所以它总是在512宽的地方，高度与原始视频成比例。一旦缩放，我就想在视频中应用水印/叠加，因此视频将缩放，但水印不会。
I am able to achieve each of these separately using the following filters:
我可以分别使用以下过滤器实现每一个:
Scale
规模
-vf "scale=512:-1"
Watermark
水印
-vf "movie=watermark.png [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]"
They work successfully on their own.
他们自己成功地工作。
However when trying to combine the two, Im having a bit of trouble.
然而，当我试图把两者结合起来的时候，我遇到了一点麻烦。
Having both as parameters of course does not work as one will override the other.
当然，作为一个参数，这两个参数并不会相互作用。
Ive tried:
我试过:
-vf "scale=512:-1,movie=watermark.png [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]"
my thinking was that the scale would be applied first then the watermark but all I get is an error
我的想法是，水印首先会应用到水印上，但我得到的只是一个错误。
Too many inputs specified for the "movie" filter.
为“movie”过滤器指定的输入太多。
Error opening filters!
打开过滤器错误!
Then changing the , to a ; resulted in:
然后把a换成a;导致:
Simple filtergraph 'scale=512:-1; movie=watermark.png [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]' does not have exactly one input and output.
简单filtergraph '规模= 512:1;电影=水印。png(水印);[in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]'并不只有一个输入和输出。
Error opening filters!
打开过滤器错误!
I presume I need to do something more with filterchains but Im struggling to figure it out.
我想我需要用过滤链做更多的事情，但我正在努力想办法解决。
Any ideas anyone?
有什么想法吗?
Many thanks in advance.
提前感谢。
3 个解决方案
#1
18
You can use the -filter_complex option with the scale and overlay filters:
您可以使用-filter_complex选项与scale和overlay过滤器:
ffmpeg -i input.mp4 -i logo.png -filter_complex "[0:v]scale=512:-1[bg];[bg][1:v]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" output
- See scale and overlay filter documentation for more info.
- 有关更多信息，请参阅scale和overlay过滤器文档。
- No need for the movie source filter as in the other examples.
- 不需要像其他例子那样使用电影源过滤器。
- You can add
-c:a copyif you want to stream copy (re-mux) the original audio instead of re-encoding it. This is useful if your input and output container formats are the same. - 您可以添加-c:如果您想要流复制(remux)的原始音频而不是重新编码它。如果您的输入和输出容器格式相同，这将非常有用。
- The example will place the logo in the center. For other placement options:
- Upper left with 10 px padding:
overlay=10:10 - 左上角有10px填充:叠加=10:10。
- Upper right with 10 px padding:
overlay=W-w-10:10 - 右上角有10px填充:叠加=W-w-10:10。
- Lower right with 10 px padding:
overlay=W-w-10:H-h-10 - 右下角有10px填充:叠加=W-w-10:H-h-10。
- Lower left with 10 px padding:
overlay=H-h-10:10 - 左下角有10px填充:叠加=H-h-10:10。
- Upper left with 10 px padding:
- 这个例子将把logo放在中间。对于其他位置选项:左上角有10个px填充:覆盖=10:10右上角有10个px填充:叠加=W-w-10 -10的右下角，有10个px填充:叠加=W-w-10:H-h-10，左下角有10个px填充:叠加=H-h-10:10。
#2
14
Thank you to both @DiJuMx and @LordNeckbeard, you both got me closer to my solution. Ive not tried the filter_complex option yet but it certainly looks simpler.
感谢@DiJuMx和@ lordbeard，你们都让我更接近我的解决方案。我还没有尝试过filter_complex选项，但它看起来确实更简单。
The solution I found to work is:
我找到的解决办法是:
-vf "movie=watermark.png [watermark]; [in]scale=512:trunc(ow/a/2)*2 [scale]; [scale][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]"
Note that Ive replaced the -1 in the scale as that had the potential to cause an uneven number of pixels in the height of the video when scaling which would then cause encoding errors.
注意，我替换了scale中的-1，因为它有可能导致在视频的高度出现不均匀的像素数量，然后缩放会导致编码错误。
#3
0
From what I understand, this might work:
据我所知，这可能行得通:
-vf "movie=watermark.png [watermark]; [in] scale=512:-1,[watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]"
You apply the scale filter to the input "[in]".
您将scale filter应用于输入“[in]”。
Unfortunately I don't have much experience with the filters on ffmpeg so I can't help further. Sorry
不幸的是，我对ffmpeg的过滤器没有太多的经验，所以我不能再进一步了。对不起
#1
18
You can use the -filter_complex option with the scale and overlay filters:
您可以使用-filter_complex选项与scale和overlay过滤器:
ffmpeg -i input.mp4 -i logo.png -filter_complex "[0:v]scale=512:-1[bg];[bg][1:v]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" output
- See scale and overlay filter documentation for more info.
- 有关更多信息，请参阅scale和overlay过滤器文档。
- No need for the movie source filter as in the other examples.
- 不需要像其他例子那样使用电影源过滤器。
- You can add
-c:a copyif you want to stream copy (re-mux) the original audio instead of re-encoding it. This is useful if your input and output container formats are the same. - 您可以添加-c:如果您想要流复制(remux)的原始音频而不是重新编码它。如果您的输入和输出容器格式相同，这将非常有用。
- The example will place the logo in the center. For other placement options:
- Upper left with 10 px padding:
overlay=10:10 - 左上角有10px填充:叠加=10:10。
- Upper right with 10 px padding:
overlay=W-w-10:10 - 右上角有10px填充:叠加=W-w-10:10。
- Lower right with 10 px padding:
overlay=W-w-10:H-h-10 - 右下角有10px填充:叠加=W-w-10:H-h-10。
- Lower left with 10 px padding:
overlay=H-h-10:10 - 左下角有10px填充:叠加=H-h-10:10。
- Upper left with 10 px padding:
- 这个例子将把logo放在中间。对于其他位置选项:左上角有10个px填充:覆盖=10:10右上角有10个px填充:叠加=W-w-10 -10的右下角，有10个px填充:叠加=W-w-10:H-h-10，左下角有10个px填充:叠加=H-h-10:10。
#2
14
Thank you to both @DiJuMx and @LordNeckbeard, you both got me closer to my solution. Ive not tried the filter_complex option yet but it certainly looks simpler.
感谢@DiJuMx和@ lordbeard，你们都让我更接近我的解决方案。我还没有尝试过filter_complex选项，但它看起来确实更简单。
The solution I found to work is:
我找到的解决办法是:
-vf "movie=watermark.png [watermark]; [in]scale=512:trunc(ow/a/2)*2 [scale]; [scale][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]"
Note that Ive replaced the -1 in the scale as that had the potential to cause an uneven number of pixels in the height of the video when scaling which would then cause encoding errors.
注意，我替换了scale中的-1，因为它有可能导致在视频的高度出现不均匀的像素数量，然后缩放会导致编码错误。
#3
0
From what I understand, this might work:
据我所知，这可能行得通:
-vf "movie=watermark.png [watermark]; [in] scale=512:-1,[watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]"
You apply the scale filter to the input "[in]".
您将scale filter应用于输入“[in]”。
Unfortunately I don't have much experience with the filters on ffmpeg so I can't help further. Sorry
不幸的是，我对ffmpeg的过滤器没有太多的经验，所以我不能再进一步了。对不起