Video types problem

Hi, can anyone tell me what im doing wrong? I have been rendering videos in blender using cycles render for some time now and never had a problem… how ever iv started wanting to add sound to my videos with in blender and have the video and sound render all at once in blender instead of having to always use a external program… the problem is the only codec that seems to alow for audio and video rendering at the same time is the FFmpeg, when i use that and the H.26 setting with mp3 audio options it seems no matter how high i put the res, sampling, or video out put options the video always turns out pixled and blocky. can anyone please help me understand how to render clean clear videos with sound in them using blender?

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