Postby Ruffa-Duffa » 20 Jul 2013 08:06
From what I can tell it definitely it isn't on all videos. I found an mkv which according to the codec information in VLC 2.0.7 on windows was using AC3 audio another using AAC audio. They ran fine on the VLC app for both my iPad 2 and my iPod 5. However when I try streaming an mkv which I transcode while streaming so it can run on the VLC for iOS app I get 2 results depending on the "profile" I use. The first "profile": H.246 + MP3 (MP4) which I assume means H.246 video and MP3 audio and that outputs no sound at all even when I just try streaming to my own computer. The second "profile": H.246 Video with MP3 audio(TS) which outputs just buzzing which I assume means the same codecs as the first "profile" just with a different container gives me what other people seem to be getting when I try streaming to my iPod 5 through VLC for iOS: a strange fuzzing sound that vaguely replicates the sound of the actual audio. What's interesting here is as far as I can tell it is using the same audio codec and getting I'm different results. The only difference is the container. MP4 is the container used by Apple and I believe means MPEG-4. From what I can tell apple's .m4v (MP4s just with a different extension) use the AAC audio codec whereas I am transcoding it to the MP3 audio codec no matter which profile I use. The second profile's container is TS which I believe is used for broadcasting HDTV or something. Not too sure about something. Anyway all of this in-depth analysis I have here doesn't explain what's happening or how to solve the problem. I just thought it might be worth noting that as far as I can tell it doesn't apply to AAC and AC3 audio and only to MP3. Not sure about DTS yet. So basically some mkvs will still work.