I have a bunch of mkv files inside them are x264 encoded vids, the audio is usually aac and sometimes ac3. I want to transcode this files into m4v or mp4 to make it natively play on aTV. So far I've manage to demux the mkv using mkvextract, but I haven't been able to find a muxer for m4v/mp4 under OS X.

If anyone can help me I'll greatly appreciate it.

I think you can mux the video files and the audio files with ffmpegx.

Originally Posted by iMags

I think you can mux the video files and the audio files with ffmpegx.

Does ffmpegx support m4v/mp4?

The thing is I dont want to reencode the video its already h.264 nor the audio which is already AAC. I just want to get the tracks into the container.

i've tried this with ffmpeg and managed to get it to create a x264 remuxed avi from a mkv but not a mp4 container. Using VisualHub I bulk converted my x264 MKVs to high bitrate (3000) H264 720p MP4s (using xgrid - very cool btw). I lost the AC3 on these but I'm not too concerned. The video quality is fine and they play smoothly on my aTV (unlike mkvs).

I have tried VisualHub to convert .mkv to Mp4 and I always get skipped frames the vidoe quality is terrible.

What bitrate do you use?

What I've done is:

Transcode with VisualHub select appleTV and "go nuts" quality then in advanced h264 options select best h264 quality. That gives me an mp4 file with AAC audio so then I open the original in quicktime and extract the AC3 track and replace the AAC track from the converted with this one, save it and it plays greatly.

Although what I've noticed from this converted videos there is some lag going on with the audio, when I start playing the file it is perfectly synced but after say 30min watching the lag increases (after 1 hour its almost 1-2 seconds out of sync) and this happens with both the AAC and the AC3 tracks. This is not only in one movie is any movie that I have converted and also it will happen the same if I fast forward the movie half way through and start playing from there, at first synced perfectly and lag starts to appear after some time. Is this an aTV bug??

VisualHub 1.23 (the one with Apple TV support) is now out with a working serial at the pink place.
Works great!

Originally Posted by sidechain

I have tried VisualHub to convert .mkv to Mp4 and I always get skipped frames the vidoe quality is terrible.

Use mkvextract to break the video and audio tracks from the .mkv file, then mux then back together as a .mp4 using mp4box.

mkvextract is in the MKVtoolnix set, and you can get a Universal Binary of mp4box if you've got ffmpegx installed - look inside its Resources folder.

Originally Posted by trashcanglam

Use mkvextract to break the video and audio tracks from the .mkv file, then mux then back together as a .mp4 using mp4box.

mkvextract is in the MKVtoolnix set, and you can get a Universal Binary of mp4box if you've got ffmpegx installed - look inside its Resources folder.

i converted mkv to mp4 in your way
but it is so complicted to do just as you say
furthermore,it will bring loss of video and audio quality.
now i use brorsoft mkv converter which can convert mkv to mp4 much more easily and fast with keeping subtitle.