The "Remove Grain" effect can cause rendering artifacts. Always preview a few seconds of your timeline before exporting.
Premiere Pro CS6 offers several denoising options, including: denoiser premiere pro cs6
Denoising is the process of removing unwanted noise or grain from video footage. Noise can manifest as random pixels or speckles, often caused by low-light conditions, high ISO settings, or poor camera quality. Denoising tools aim to minimize these distractions, resulting in a cleaner, more visually appealing image. The "Remove Grain" effect can cause rendering artifacts
Do not apply the denoiser to the whole timeline immediately. Find the clip with the worst noise. Noise can manifest as random pixels or speckles,
Duplicate your clip onto Video Track 2. Apply a slight blur to the bottom layer (V1) to hide noise, then use the Luma Key on the top layer (V2) to only show highlights, preserving some original detail over the smoothed shadows.
Premiere Pro CS6 includes a built-in effect for audio, though it is known for being temperamental.