# Step 5: Mux into final container (MP4 or MKV) # We take the audio/subs from the original file and merge with new video cmd_mux = [ "ffmpeg", "-i", "final_p8.hevc", "-i", self.input_file, "-map", "0:v", "-map", "1:a", "-map", "1:s?", "-c", "copy", "-strict", "unofficial", self.output_file, "-y" ] subprocess.run(cmd_mux, check=True)
RPU merging & packaging
If you are building this into a modern app, do not rely on raw FFmpeg commands for the metadata manipulation. Use the dovi_tool Rust library (libdovi) directly if you are coding in Rust/C++, or wrap the binary securely. This ensures you handle the specific bitstream requirements of the RPU correctly without corrupting frame timing. convert dolby vision profile 7 to profile 8 new
To backup your source media into a manageable container. The Conversion Workflow # Step 5: Mux into final container (MP4