user3459: I am trying to use FFmpeg to overlay one video on top of the other using an additive blend. One video is the actual video I want to transcode, the other is a ~10 second long video I want to put into one corner, sort of an animated watermark. The watermark video is some white animated stuff with a black background.
So far, I have tried something along these lines:
$ /d/ffmpeg/ffmpeg.exe -i actualvideo.mkv -i myoverlay.mp4 \
-filter_complex "[1:0] setsar=sar=1 [1sared]; [0:0][1sared] blend=all_mode='addition':repeatlast=1" \
test.mkv

The setsar seemed necessary as otherwise it would complain:
[Parsed_blend_0 @ 00000000043e0e40] First input link top parameters (size 1280x720, SAR 1:1) do not match the corresponding second input link bottom parameters (1280x720, SAR 0:1)

With the setsar there's no complaint, but the output video looks.. mostly pink. Both videos look fine when viewed on their own before I feed them into FFmpeg.
Any ideas? Am I doing something wrong?

user3459: I found a helpful post on stackoverflow that addresses this issue: https://stackoverflow.com/a/21400416/377875
Apparently, it's a problem with color space. Something like this works:
ffmpeg -i "$1" -i "$2" \
-filter_complex "[1:0] setsar=sar=1,format=rgba [1sared]; [0:0]format=rgba [0rgbd]; [0rgbd][1sared]blend=all_mode='addition':repeatlast=1:all_opacity=1,format=yuva422p10le" \
-c:v libx264 -preset slow -tune film -crf 19 \
-c:a aac -strict -2 -ac 2 -b:a 256k \
-pix_fmt yuv420p "$3"

(substitute $1 with your actual video, $2 with your overlay, and $3 with the output file name)

3459: <p>I am trying to use FFmpeg to overlay one video on top of the other using an additive blend. One video is the actual video I want to transcode, the other is a ~10 second long video I want to put into one corner, sort of an animated watermark. The watermark video is some white animated stuff with a black background.</p>

<p>So far, I have tried something along these lines:</p>

<pre><code>$ /d/ffmpeg/ffmpeg.exe -i actualvideo.mkv -i myoverlay.mp4 \
-filter_complex "[1:0] setsar=sar=1 [1sared]; [0:0][1sared] blend=all_mode='addition':repeatlast=1" \
test.mkv
</code></pre>

<p>The <code>setsar</code> seemed necessary as otherwise it would complain:</p>

<pre><code>[Parsed_blend_0 @ 00000000043e0e40] First input link top parameters (size 1280x720, SAR 1:1) do not match the corresponding second input link bottom parameters (1280x720, SAR 0:1)
</code></pre>

<p>With the <code>setsar</code> there's no complaint, but the output video looks.. mostly pink. Both videos look fine when viewed on their own before I feed them into FFmpeg.</p>

<p>Any ideas? Am I doing something wrong?</p>
 3459: <p>I found a helpful post on stackoverflow that addresses this issue: <a href="https://stackoverflow.com/a/21400416/377875">https://stackoverflow.com/a/21400416/377875</a></p>

<p>Apparently, it's a problem with color space. Something like this works:</p>

<pre><code>ffmpeg -i "$1" -i "$2" \
-filter_complex "[1:0] setsar=sar=1,format=rgba [1sared]; [0:0]format=rgba [0rgbd]; [0rgbd][1sared]blend=all_mode='addition':repeatlast=1:all_opacity=1,format=yuva422p10le" \
-c:v libx264 -preset slow -tune film -crf 19 \
-c:a aac -strict -2 -ac 2 -b:a 256k \
-pix_fmt yuv420p "$3"
</code></pre>

<p>(substitute <code>$1</code> with your actual video, <code>$2</code> with your overlay, and <code>$3</code> with the output file name)</p>
