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avconv -i file.mkv -c:v copy -c:a copy file.mp4

avconv -i File_name1.mkv -codec copy File_name1.mp4

avconv  -i P1010989.MOV -vcodec copy -acodec copy out.mp4

avconv -i P1010989.MOV -vcodec copy -acodec aac -strict -2 -b:a 384k out.mp4

avconv -i audio_name.mka -i video_name.mkv -vcodec copy -acodec aac -strict -2 -b:a 384k out.mp4

avconv -i audio_name.mka -i video_name.mkv -acodec copy -vcodec copy output.mkv