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  1. Member
    Join Date
    Feb 2019
    Location
    Australia
    Search Comp PM
    I've recently come across this site and thought it might be able to solve my problem.
    The downloaded TV programs that I watch on my Sony Bravia - stored on a hard drive connected via USB - are usually in MKV format. On occasions the programs - which play fine on my PC - have no sound when played on the TV. I can usually get over this by converting the MKV file to MKV via Format Factory or by converting to MP4 via either Vidcoder or Handbrake.
    Very occasionally I have a program that, whatever I do I cannot get to play with sound.
    Can anyone tell me why this might be so and whether there is an easy, guaranteed method of fixing the problem.

    A case in point:

    Matroska 651 MiB, 1 Video Stream AVC, 1 Audio Stream AAC LC
    Last edited by Trooper Meade; 21st Feb 2019 at 02:36.
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  2. Member Krispy Kritter's Avatar
    Join Date
    Jul 2003
    Location
    St Louis, MO USA
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    First a few details: mkv is just a container. It holds video, audio, subtitles, etc. Your TV apparently supports "mkv", so if some work, and others don't, it's not an "mkv" issue. Most likely the video or audio streams within that container aren't supported by your TV. As you have video, but no audio, it's apparently the audio files at fault.

    There are numerous audio formats, you need to find out what is supported by your TV. The details should be covered in the User Manual. If not, you can simply compare a working file and a non-working file. You will very likely see the audio type is different.

    Most likely, the TV supports the usual stereo and older DD5.1 or AC3 audio streams but not the new HD formats (or maybe just a specific new HD format).
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  3. Member
    Join Date
    Feb 2019
    Location
    Australia
    Search Comp PM
    Thanks all. I've found that Handbrake to MP4 fixes just about all the problems I've been having. A pain to have to do it but at least I can.
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  4. Since it is a downloaded file, you have no control over how the video and audio in that file were created. Many of the somewhat shady characters who upload videos do so with tools which are designed to make the file really small. This means that most of them are encoded with variable bitrate. Since many of these kiddiehackers are not well-versed in making an end product that plays on a wide range of equipment, they don't look at the maximum bitrates allowed by consumer TVs. So, what I suspect may be happening is that when either the total bitrate (audio+video) or the audio bitrate temporarily exceeds the limit that your TV can handle, it freezes or, in your cases, stops playing the audio. Your re-encode not only changes format, which is probably not the issue at all, but the bitrate profile as well.
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