I am working on converting audio track of video files. In these files video is encoded with h263 codec and audio with AMR_WB.
I have to convert audio track to be encoded with AAC coded. So the new video should be encoded with h263 and sound with AAC. My general approach is to copy video frame without reencoding to output stream and rencode sound with AAC codec. The first problem is to create output context with h263 video codec and AAC audio codec. I am not sure if it is possible?. In all examples I saw "av_guess_format" is used to create audio and video context. For file path with extension "mp4" it creates context with mpeg4 and AAC codes. How to create this context I need?
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