user25202: So I want to create videos that had a red overlay, effect and I assume that blend is the right options filter for this. Here my command :
ffmpeg -i dogs.mp4 -i red.jpg -filter_complex '[1:v]scale=1280:720[ckout];[0:v][ckout]blend=all_mode='multiply'[out]' -map '[out]' output.mp4

But when i tried this I always got : 
Press [q] to stop, [?] for help
[swscaler @ 00000263f19a9560] deprecated pixel format used, make sure you did set range correctly
[Parsed_blend_1 @ 00000263f192fa20] First input link top parameters (size 1920x1080, SAR 0:1) do not match the corresponding second input link bottom parameters (1280x720, SAR 1:1)
[Parsed_blend_1 @ 00000263f192fa20] Failed to configure output pad on Parsed_blend_1
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!

What is the right command for this?

user1871: The blend filter requires both inputs to have the same resolution. You can use the scale2ref filter to resize the overlay.
ffmpeg -i dogs.mp4 -i red.jpg -filter_complex '[1:v][0:v]scale2ref[ckout][vid];[vid][ckout]blend=all_mode='multiply'[out]' -map '[out]' output.mp4

25202: <p>So I want to create videos that had a red overlay, effect and I assume that <code>blend</code> is the right options filter for this. Here my command :</p>

<pre><code>ffmpeg -i dogs.mp4 -i red.jpg -filter_complex '[1:v]scale=1280:720[ckout];[0:v][ckout]blend=all_mode='multiply'[out]' -map '[out]' output.mp4
</code></pre>

<p>But when i tried this I always got : </p>

<pre><code>Press [q] to stop, [?] for help
[swscaler @ 00000263f19a9560] deprecated pixel format used, make sure you did set range correctly
[Parsed_blend_1 @ 00000263f192fa20] First input link top parameters (size 1920x1080, SAR 0:1) do not match the corresponding second input link bottom parameters (1280x720, SAR 1:1)
[Parsed_blend_1 @ 00000263f192fa20] Failed to configure output pad on Parsed_blend_1
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!
</code></pre>

<p>What is the right command for this?</p>
 1871: <p>The blend filter requires both inputs to have the same resolution. You can use the scale2ref filter to resize the overlay.</p>

<p><code>ffmpeg -i dogs.mp4 -i red.jpg -filter_complex '[1:v][0:v]scale2ref[ckout][vid];[vid][ckout]blend=all_mode='multiply'[out]' -map '[out]' output.mp4</code></p>
