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famous600
Aug 2, 2013, 09:58 PM
So I have a lot of mkv files I converted to mp4 and converted the audio to AAC 5.1 however when I play a video on my iPad via home sharing I get no audio :( I've confirmed the audio was converted. Any thoughts?



waw74
Aug 2, 2013, 11:33 PM
http://www.apple.com/ipad/specs/
Audio Playback
Frequency response: 20Hz to 20,000Hz
Audio formats supported: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV
User-configurable maximum volume limit
TV and Video
AirPlay mirroring and video out to Apple TV (2nd and 3rd generation)
Video mirroring and video out support: Up to 1080p through Lightning Digital AV Adapter and Lightning to VGA Adapter (adapters sold separately)
Video formats supported: H.264 video up to 1080p, 30 frames per second, High Profile level 4.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG‑4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format

you need to add a second audio track in stereo

spacepower7
Aug 2, 2013, 11:36 PM
IIRC none of the iOS devices can play videos with just 5.1 AAC. I think you need a stereo 2.0 AAC in addition to the 5.1 AAC. Or just a 2.0 AAC mix

If you have a Mac, try converting with Subler which can downmix the 5.1 to 2.0.

Che Castro
Aug 4, 2013, 03:25 AM
If the mkv has h264 in it you don't need to convert it just muxed it

Get the program mp4tools load the video in it , it should tell you if the video is h264 and mp4tools can convert the audio or add a stereo track

If the video mkv is h264 mp4tools will turn it into an mp4/m4v in a minute or 2


But also you can use a program called iFlicks , you can throw your mkv's in there & it will add the stereo track automatically ,also add the movie covers metadata and will send the video to iTunes for you
Also just like mp4tools the muxing or whatever is called takes only a few minutes
It does not convert the video unless is mpegg & that takes 30 minutes or longer