avcodecmap: Set AAC/H264/H265 stream-format for demuxer/encoder situations if...

avcodecmap: Set AAC/H264/H265 stream-format for demuxer/encoder situations if no codec_data is provided

This fixes output of the above formats from demuxers.
26 jobs for avcodecmap-aac-h2645 in 38 minutes and 36 seconds (queued for 7 seconds)