Hey there, let’s work through these Blender 2.79 issues— I’ve dealt with similar headaches back when I was using this version for video projects, so here’s a step-by-step breakdown of fixes:

1. Resolving Severe Render Pixelation #

Pixelation in HD output usually boils down to misconfigured resolution, sampling, or anti-aliasing settings. Let’s tackle each angle:

• Double-check Resolution & Scale
  Head to the Output tab, under the Resolution section. Make sure:

  • X/Y values are set to 1920x1080 (standard HD)
  • The Scale slider is set to 1.0 (a fraction like 0.5 would shrink your render and stretch it back to HD, causing pixelation)

• Adjust Sampling Settings
  Depending on your render engine:

  • For Cycles: Go to the Render tab > Sampling. Set Render Samples to at least 128 (256 is a safe bet for smooth HD output). Uncheck "Use Preview Settings" to ensure your final render uses the higher sample count, not the low preview value.
  • For Blender Render: In the Render tab > Anti-Aliasing, switch the Filter Type to Mitchell-Netravali or Gaussian, and set Filter Size to 1.5–2.0. This softens jagged edges that can look like pixelation.

• Tweak Output Compression
  In the Output tab > Format:

  • If you’re using H.264 (MP4), set Quality to 90 or higher. Low-quality compression crushes detail and creates pixelation.
  • Test with a lossless format like AVI Raw first— if the output is sharp, the problem is just over-compression, not your core render settings.

• Disable Render Border
  Accidentally enabling Render Border (Ctrl+Alt+B in the 3D view) will only render a cropped section of your scene, which gets stretched to HD size. Fix this by:

  • Pressing Ctrl+Alt+B again to clear the border, or unchecking Render Border in the Render tab.

2. Fixing Missing File Extensions #

Blender 2.79 has a quirky bug where it sometimes skips auto-adding extensions to output files. Try these quick fixes:

• Manually Add the Extension
  In the Output tab > File Path, type the full filename including the extension (e.g., my_final_video.mp4 or project_render.avi). Don’t rely on Blender to append it automatically.

• Check Output Folder Permissions
  If you’re rendering to a system-protected folder (like C:\ root), Blender might not have permission to write proper filenames. Switch to a user-owned folder (e.g., Documents/Blender Outputs) and try again.

• Update to Blender 2.79b
  The final stable release of 2.79 (2.79b) fixed several output-related bugs, including missing extensions. If you’re on an older sub-version, grab this update— it’s a quick fix for many odd issues.

Quick Troubleshooting Tip #

Render a single test frame first (go to Render tab > Render Image) instead of rendering the whole video. This lets you quickly test if your settings fix the pixelation without wasting time on a full render.

内容的提问来源于stack exchange，提问作者dazdread