ON merge audio change video quality

[imvijaykaushik]

Hello all,
Please any one get this issue, actually i am adding audio into my pre-recorded video, quality of video decrease after merge audio.
below in my code

EpEditor.music(orginal_video_url, audio_file_url, video_output_file_url, 0, 1, new OnEditorListener() {
@OverRide
public void onSuccess() {
//playvideo
}
@OverRide
public void onFailure() {
//show errer
}
@OverRide
public void onProgress(float progress) {
//update progress
}
});

Please help me for this.
Very Thanks in advance