Suppress ffmpeg diagnostic noise in MP4 output

sbryngelson · claude · sbryngelson · commit 467c60b43501 · 2026-02-24T19:40:26.000-05:00
Pass ffmpeg_log_level='error' to imageio.mimwrite so the rawvideo
probesize warning is not printed for short videos.

Co-Authored-By: Claude Sonnet 4.6 &lt;noreply@anthropic.com&gt;
diff --git a/toolchain/mfc/viz/renderer.py b/toolchain/mfc/viz/renderer.py
@@ -242,6 +242,7 @@ def render_mp4(varname, steps, output, fps=10,  # pylint: disable=too-many-argum
             output,
             [imageio.imread(os.path.join(viz_dir, fname)) for fname in frame_files],
             fps=fps, codec='libx264', pixelformat='yuv420p', macro_block_size=2,
+            ffmpeg_log_level='error',
         )
         success = True
     except (OSError, ValueError, RuntimeError) as exc:

Original file line number	Diff line number	Diff line change
`@@ -242,6 +242,7 @@ def render_mp4(varname, steps, output, fps=10, # pylint: disable=too-many-argum`
`242`	`242`	`output,`
`243`	`243`	`[imageio.imread(os.path.join(viz_dir, fname)) for fname in frame_files],`
`244`	`244`	`fps=fps, codec='libx264', pixelformat='yuv420p', macro_block_size=2,`
	`245`	`+ ffmpeg_log_level='error',`
`245`	`246`	`)`
`246`	`247`	`success = True`
`247`	`248`	`except (OSError, ValueError, RuntimeError) as exc:`