I've been deveoping an android app (using ChatGPT - I have no real android development knowledge!) which animates a dog's mouth through the camera feed. I had the app working okay but with some latency between the camera feed and the overlay (using CameraX and a PreviewView), so I tried to update it to an offscreen rendering approach, using an EGL context and MediaCodec surface to render the camera feed plus overlays into a single composited output.
However, the I have not implemented this correclty and the camera feed is just showing a black screen.
Here's ChatGPT's summary of what we had originally (working) and what we changed it to. Both of these approaches are saved on different github branches which you will have access to. You can see the previously working version on the master branch, and the newly updated (not working) version on a test branch.
What We Had Originally - An Android app (Kotlin) using CameraX and a PreviewView to display the live camera feed. - A BoundingBoxOverlay custom View drawn on top for YOLO pose detection (dog’s mouth, eyes, etc.). - We wanted to animate the dog’s mouth in sync with audio but were limited by the traditional overlay.
What We Changed It To Offscreen Rendering Approach: - Created an EGL context and MediaCodec surface (via OffscreenRenderer.kt) to render the camera feed plus overlays into a single composited output. - The camera feed is now provided by a SurfaceTexture created from an external OES texture (rather than using PreviewView). - CameraX is configured to output frames to that SurfaceTexture. - A custom pipeline composites the camera and any overlays (animated mouth, etc.) in OpenGL, then encodes to a video file with MediaCodec.
What We’re Trying to Achieve A Snapchat-like pipeline: - Grab the camera feed directly via a SurfaceTexture (external OES texture). - Apply real-time overlays/filters (like mouth animation, hats, glasses) in OpenGL. - Composite everything offscreen and encode it into a video file (for recording). - Avoid the performance constraints of standard Android Views by relying on OpenGL compositing (similar to Snapchat filters).
Despite these changes, the feed currently displays a black screen. We suspect an issue with the GL pipeline, resolution mismatch, or camera frames not drawing as intended.
Goal: Fix the offscreen renderer so that camera frames plus overlays appear in real time, and video recording also works as expected.
UI Design for CRM Landing Page Category: Figma, Graphic Design, HTML, UI / User Interface, User Experience Research, User Interface / IA, Web Design Budget: ₹600 - ₹1500 INR
24-Mar-2026 11:04 GMT
Modern Clean Figma Showcase Site Category: Figma, Graphic Design, Photoshop, UI / User Interface, User Interface / IA, Web Application, Web Design, Web Development Budget: ₹1500 - ₹12500 INR
Urgent Email Restore & Migration Category: Cloud Computing, CPanel, Linux, Network Administration, PHP, System Administration, Technical Support, Troubleshooting, Web Hosting, Web Security Budget: $10 - $30 USD
24-Mar-2026 10:57 GMT
AI Search Optimization Expert | Rank on Google, ChatGPT & AI Platforms Category: AI (Artificial Intelligence) HW / SW, AI Chatbot Development, AI Content Creation, AI Development, AI Model Development, AI Text To Text, Internet Marketing, Link Building, Search Engine Marketing (SEM), SEO Budget: ₹75000 - ₹150000 INR
24-Mar-2026 10:55 GMT
Social Media Manager Πωλήσεων Αυτοκινήτων Category: A / B Testing, Advertising, Analytics, Content Creation, Content Strategy, Digital Marketing, Facebook Marketing, Social Media Management, Social Media Marketing Budget: €250 - €750 EUR
24-Mar-2026 10:55 GMT
SEO | AEO | GEO Expert Proposal Category: Content Strategy, Content Writing, Conversational AI, Generative AI, Internet Marketing, Keyword Research, Link Building, Marketing, Prompt Engineering, SEO Budget: ₹150000 - ₹250000 INR
24-Mar-2026 10:53 GMT
Edición Creativa de Promos Category: Adobe Premiere Pro, After Effects, Animation, Creative Design, DaVinci Resolve, Graphic Design, Motion Graphics, Video Editing, Video Production, Video Services Budget: £18 - £36 GBP
