diff --git a/internal/worker/command_ffmpeg.go b/internal/worker/command_ffmpeg.go
index 55c6d316..b60ff275 100644
--- a/internal/worker/command_ffmpeg.go
+++ b/internal/worker/command_ffmpeg.go
@@ -214,6 +214,9 @@ func (p *CreateVideoParams) getInputGlob() ([]string, func(), error) {
 	}
 
 	cliArgs := []string{
+		// FFmpeg needs the input frame rate as well, otherwise it'll default to 25
+		// FPS, and mysteriously drop frames when rendering a 24 FPS shot.
+		"-r", strconv.FormatFloat(p.fps, 'f', -1, 64),
 		"-pattern_type", "glob",
 		"-i", crosspath.ToSlash(p.inputGlob),
 	}
diff --git a/internal/worker/command_ffmpeg_test.go b/internal/worker/command_ffmpeg_test.go
index bf3a6bd0..1de4dacf 100644
--- a/internal/worker/command_ffmpeg_test.go
+++ b/internal/worker/command_ffmpeg_test.go
@@ -42,10 +42,11 @@ func TestCmdFramesToVideoSimplePosix(t *testing.T) {
 
 	cliArgs := []string{
 		"-v", "quiet", // exe
-		"-report",                                              // argsBefore
+		"-report",  // argsBefore
+		"-r", "10", // input frame rate
 		"-pattern_type", "glob", "-i", "path/to/renders/*.png", // inputGlob
 		"-c:v", "hevc", "-crf", "31", "-vf", "pad=ceil(iw/2)*2:ceil(ih/2)*2", // args
-		"-r", "10", // fps
+		"-r", "10", // output frame rate
 		"path/to/renders/preview.mkv", // outputFile
 	}
 	mocks.cli.EXPECT().CommandContext(gomock.Any(), "/path/to/ffmpeg", cliArgs).Return(nil)