yt-dlp malformed aac bitstream

[David Banner]

Downloaded video with yt-dlp and get sound file separate. |They won't merge. Message "malformed aac bitstream install FFMpeg to fix this automatically." I have ffmpeg in the same folder as yt-dlp.What do they mean install fmmpeg?

Also is there a way to join the video and audio and have them in sync?

[[ss]vegeta]

What is the command you used for merging?

You can synchronize the audio and video with ffmpeg with the following command

ffmpeg.exe -i "movie.mp4" -itsoffset 3.84 -i "movie.mp4" -map 0:v -map 1:a -c copy "movie-audio-delayed.mp4"

You need to change the 3.84 with the corresponding delay. It might need negative number, it might need positive.

[codehound]

There's probably, in all likelihood nothing wrong with the downloaded aac file. It's the way fmpeg is interpreting it and baulking at it.

With ffmpeg and ffprobe in the same directory as yt-dlp - in this instance try to download both the video and audio with ffmpeg, therefore giving it less opportunity to complain, thus:

Substitute your selections where I have used bv+ba for testing.

yt-dlp -f bv+ba --hls-prefer-ffmpeg "URL"

or because the mp4 format is stricter than mkv for accepting audio formats, you could use mkv:

yt-dlp -f bv+ba --hls-prefer-ffmpeg "URL" --merge-output-format mkv