ffmpeg

can do this easily from command line

ffmpeg -i input.mp4 output.mpeg

There are felt one million additional options to change the output format.

Softsubs

MP4 supports streaming text format subtitles, but playback support for this among players and devices is not universal.

Basic example using default stream selection behavior while stream copying the audio:

ffmpeg -i input.mkv -c copy -c:s mov_text output.mp4

Example to stream copy all of the video and audio streams, convert the all text based subtitle input streams (SRT, ASS, VTT, etc) to the streaming text format, and set the language for the first two subtitle streams.

ffmpeg -i input.mkv -map 0 -c copy -c:s mov_text -metadata:s:s:0 language=eng -metadata:s:s:1 language=ipk output.mp4

Same as above but re-encode the video and audio to formats compatible with the MP4 container (H.264 video:

ffmpeg -i input.mkv -map 0 -c:v libx264 -c:a aac -c:s mov_text -metadata:s:s:0 language=eng -metadata:s:s:1 language=ipk output.mp4

Same as above but use the -map option to choose the first video stream, second audio stream, and third subtitle stream:

ffmpeg -i input.mkv -map 0:v:0 -map 0:a:1 -map 0:s:2 -c:v libx264 -c:a aac -c:s mov_text -metadata:s:s:0 language=eng output.mp4

Hardsubs

Text based subtitle format inputs

Use the subtitles filter to "burn-in" text based subtitle formats (SRT, ASS, VTT, etc). Note that this requires re-encoding, so it will by much slower than using softsubs.

Basic example using default stream selection behavior while stream copying the audio:

ffmpeg -i input.mkv -filter_complex "subtitles=input.mkv" -c:a copy output.mp4

Example to use the third video stream, fifth subtitle stream, and first audio stream:

ffmpeg -i input.mkv -filter_complex "[0:v:2]subtitles=input.mkv:si=4[v]" -map "[v]" -map 0:a:0 -c:a copy output.mp4

Example for a separate subtitle input file (your-subtitles-file.srt):

ffmpeg -i input.mp4 -filter_complex "subtitles=your-subtitles-file.srt" -c:a copy output.mp4

Image based subtitle format inputs

Use the overlay filter. This example will overlay the fourth subtitle stream over the second video stream, and stream copy the seventh audio stream:

ffmpeg -i input.mkv -filter_complex "[0:v:2][0:s:3]overlay[v]" -map "[v]" -map 0:a:6 -c:a copy output.mp4

Also see

• FFmpeg Wiki: Subtitles
• How to use the -map option to choose streams