<p>ffplay is designed to play a single input. So, a workaround is needed.</p>

<pre><code>ffplay -f lavfi "movie=org[a];movie=enc[b];[a][b]blend=all_mode=difference"
</code></pre>

<p>A filtergraph is created and movie source filters used to open the files, then blended.</p>

CC BY-SA 4.0
2018-05-23T23:40:37.370Z
I got error Argument [filename]  provided as input filename, but [filename][a]; "  was already specified.
Alex Zubkov
CC BY-SA 4.0
2018-05-24T05:04:23.770Z
Add `report` to command and share report.
Gyan
CC BY-SA 4.0
2018-05-24T22:32:21.137Z
https://pastebin.com/bZdu5GL0 - report
Alex Zubkov
CC BY-SA 4.0
2018-05-25T05:25:41.467Z
The command has to be in the form in my answer: `ffplay -f lavfi "movie='C\:/Users/Lover/Desktop/video.wmv'[a];movie='C\:/Users/Lover/Desktop/video - Copy.wmv'[b];[a][b]blend=all_mode=difference"`
Gyan
CC BY-SA 4.0
2018-05-25T16:43:32.870Z
great! That works, is there any way how to create 2 ffplay windows to compare side by side? This blend mode doesn't help too much in my case. I can tell they different in terms of pixel peeping but i need full range of colors.
Alex Zubkov
CC BY-SA 4.0
2018-05-25T16:44:32.070Z
Instead of `blend=all_mode=difference` use `hstack`
Gyan
CC BY-SA 4.0
2018-05-25T16:48:43.653Z
I was aiming for! Thx a lot
Alex Zubkov
CC BY-SA 4.0
2018-05-23T06:57:54.070Z
2018-05-23T13:16:45.587Z
2018-05-23T13:16:45.587Z
Gyan
<p>One of those videos lower resolution, another one is higher</p>

<pre><code>ffplay.exe -i [PATHTOFILE][org] -i[PATHTOFILE][enc];\
[org][enc]blend=all_mode=difference"enter code here
</code></pre>

<p>but i got error </p>

<pre><code>    No such filter: [filename1][org][filename2][enc];
[org][enc]blend=all_mode=difference: Invalid argument
</code></pre>

<p>I Just want to compare my videos utilizing <strong>FFPLAY</strong> with many inputs to save some memory.</p>

<ffmpeg><video-editor><signal-processing>
I want to compare two video files using FFPLAY
Alex Zubkov
# I want to compare two video files using FFPLAY

(Asked by: username_0 on 2018-05-23)

One of those videos lower resolution, another one is higher
ffplay.exe -i [PATHTOFILE][org] -i[PATHTOFILE][enc];\
[org][enc]blend=all_mode=difference"enter code here

but i got error 
    No such filter: [filename1][org][filename2][enc];
[org][enc]blend=all_mode=difference: Invalid argument

I Just want to compare my videos utilizing FFPLAY with many inputs to save some memory.

**Tags:** ffmpeg, video-editor, signal-processing


---

## 1 answers

### Answer by username_1 on 2018-05-23. Score: 2 | Accepted answer

ffplay is designed to play a single input. So, a workaround is needed.
ffplay -f lavfi "movie=org[a];movie=enc[b];[a][b]blend=all_mode=difference"

A filtergraph is created and movie source filters used to open the files, then blended.

> **Comments:**
> **username_0**: I got error Argument [filename]  provided as input filename, but [filename][a]; "  was already specified.  
> **username_1**: Add `report` to command and share report.  
> **username_0**: https://pastebin.com/bZdu5GL0 - report  
> **username_1**: The command has to be in the form in my answer: `ffplay -f lavfi "movie='C\:/Users/Lover/Desktop/video.wmv'[a];movie='C\:/Users/Lover/Desktop/video - Copy.wmv'[b];[a][b]blend=all_mode=difference"`  
> **username_0**: great! That works, is there any way how to create 2 ffplay windows to compare side by side? This blend mode doesn't help too much in my case. I can tell they different in terms of pixel peeping but i need full range of colors.  
> **username_1**: Instead of `blend=all_mode=difference` use `hstack`  
> **username_0**: I was aiming for! Thx a lot  

---

