user22009: I tried consequentially commands below. On output I'm getting video with a mess (even.mp4).
ffmpeg -i in.MOV -an -vcodec rawvideo -pix_fmt yuv420p rawbitstream.yuv

ffmpeg -r 2 -s 640x480 -i rawbitstream.yuv -vf select="not(mod(n-1\,2))" -c:v rawvideo -r 1 -format rawvideo -pix_fmt yuv420p -an even.yuv

ffmpeg -f rawvideo -vcodec rawvideo -s 640x480 -r 25 -pix_fmt yuv420p -i even.yuv -c:v libx264 -preset ultrafast -qp 0 even.mp4


Here is full log.
Video files are here.

user1871: Use
ffmpeg -i in.MOV -an -vcodec rawvideo -pix_fmt yuv420p rawbitstream.yuv

ffmpeg -s 640x480 -i rawbitstream.yuv -vf select="not(mod(n+1\,2))" -c:v rawvideo -vsync 0 -an even.yuv

ffmpeg -f rawvideo -s 640x480 -pix_fmt yuv420p -i even.yuv -c:v libx264 -preset ultrafast -profile:v high -qp 1 even.mp4


22009: <p>I tried consequentially commands below. On output I'm getting video with a mess (even.mp4).</p>

<pre><code>ffmpeg -i in.MOV -an -vcodec rawvideo -pix_fmt yuv420p rawbitstream.yuv

ffmpeg -r 2 -s 640x480 -i rawbitstream.yuv -vf select="not(mod(n-1\,2))" -c:v rawvideo -r 1 -format rawvideo -pix_fmt yuv420p -an even.yuv

ffmpeg -f rawvideo -vcodec rawvideo -s 640x480 -r 25 -pix_fmt yuv420p -i even.yuv -c:v libx264 -preset ultrafast -qp 0 even.mp4
</code></pre>

<p><a href="https://i.stack.imgur.com/DMuje.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DMuje.jpg" alt="enter image description here"></a></p>

<p>Here is <a href="https://drive.google.com/open?id=1SQEPPZGB4ogf6cbczejbiyTdwK-1twfm" rel="nofollow noreferrer">full log</a>.
Video files are <a href="https://drive.google.com/open?id=1YfIwWo4FloOONNA8Fw05czAmWg3K__ei" rel="nofollow noreferrer">here</a>.</p>
 1871: <p>Use</p>

<pre><code>ffmpeg -i in.MOV -an -vcodec rawvideo -pix_fmt yuv420p rawbitstream.yuv

ffmpeg -s 640x480 -i rawbitstream.yuv -vf select="not(mod(n+1\,2))" -c:v rawvideo -vsync 0 -an even.yuv

ffmpeg -f rawvideo -s 640x480 -pix_fmt yuv420p -i even.yuv -c:v libx264 -preset ultrafast -profile:v high -qp 1 even.mp4
</code></pre>
