Knowing these details will help me provide a specific solution to get your render finished. H.264 exporting error - Adobe Community
Avoid direct H.264 exports from After Effects. Instead, render to a high-quality format (like Apple ProRes or DNxHD) and convert to .mp4 later.
Are you using any (like Sapphire or Element 3D)? Comp 1.mp4
Pre-compose all layers so only one layer exists in the timeline.
Troubleshoot by removing third-party effects, particularly if the render crashes. Clear Cache: Clear the After Effects Media Cache . If your "Comp 1.mp4" is failing, can you tell me: Which error code are you seeing (e.g., -1609629695)? Knowing these details will help me provide a
Error codes like -1609629695 or Error code 3 . Rendering Stuck: The process hangs at a specific timecode. Troubleshooting & Fixes (The Write-up):
Writing with exporter: H.264. Writing to file: \\?\ C:\Users\rolenzj\Desktop\Comp 1.mp4. Writing file type: H264. Around timecode: Are you using any (like Sapphire or Element 3D)
In Adobe Media Encoder , go to Preferences > Media and turn off Hardware Encoding/Decoding to force software rendering.