Converted MP4 video file to H.264, but there is no sound

Question

I have an MP4 video file. I'm turning this into H.264. After converting, the video looks good, but there is no sound. Can you help me?

ffmpeg -i input.mp4 -vcodec libx264 -acodec aac output.h264

Solution

.264 represents a raw H264 bitstream so no audio will be present. If you want the video in input to be transcoded to a H264 stream, use

ffmpeg -i input.mp4 -vcodec libx264 -acodec aac output.mp4

But check if it is already H264. Run ffprobe input.mp4.

Comments

[slhck]

What do you actually want to do? This seems like an XY problem (xyproblem.info)

[siklopentan]

But this time it appears to be mp4. I want to see it as h.264. Is not there a way to do this?

[user1686]

@siklopentan: H.264 and MP4 are different classes entirely – one is a codec, the other a container holding codecs. So a file could be both at the same time. (And probably is.)