To create a audio/Video editing app on Android / IOS with only basic editing functions.
1. set multiple breaking points on audio track
2. play the audio between 2 breaking points.
3. save and share audio between 2 breaking points.
4. play at slow / fast speed
5. add subtitle / transcription along the audio track
6. save the project including all breaking points / subtitles / transcription
7. all customize playing by breaking points. e.g. breaking point A -> B- A -> C.
Please propose your technical solutions and budget.