To add audio with .ts video file and convert into mp4 you can use FFmpeg. Check below link for installation steps of FFmpeg: How to setup, install, configure, use ffmpeg on Windows 10 Follow below steps to achieve above target: Open CMD and set the path where your audio and ts video files are placed: Now use below command to add audio to ts file and convert into mp4. ffmpeg -i audio_file_name.audio_ext -i video_file_name.video_ext -async 1 -c copy output_video_name.encoding_extension ffmpeg -i 01_audio.aac -i 01.ts -async 1 -c copy 01.mp4 I have done this because my download manager didn't able to download audio in TS file, I got audio and TS file separately. If you have video data only in TS files, and audio data only in another TS files. You can use tsMuxer to add the audio stream from one .ts file into the .ts file containing the video or vice versa. This is called muxing and doesn't affect the quality of the audio or video in any way. ...