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  1. I have an MKV file who's audio plays well from my PC.
    But, when played from our TV, the audio comes through garbled.

    I have run into this before with an AVI file.
    I tried converting the audio a few times with no success.

    Is there a way to fix this problem?
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  2. Member awgie's Avatar
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    Need more information.
    • What are the specs of the MKV file - specifically what audio codec is used?
    • How are you playing it on the TV?
    • How are you converting the audio? And to what?

    You need to make sure that the audio codec used is compatible with whatever you're using to play it on the TV. Your PC will undoubtedly play dozens of different audio formats just fine, but your TV may not.
    Do or do not. There is no "try." - Yoda
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  3. It's a good thing you didn't clutter up your post with information like the model of the TV, the container and audio codecs of the file, how you're playing the video on your TV (media player built into the TV, some other media player, your computer), and stuff like that. It's so much more fun trying to divine that information.
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  4. lol @ jagabo. are you using a crystal ball? is it 4k though?
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  5. Yeah I know, I didn't give much information.
    But then, I wasn't sure exactly what was needed to figure this out.

    1.
    How do I find what is contained in the MKV file?

    2.
    The TV is a JVC SP55M-C.
    I believe that it does auto firmware updates.
    The first time I loaded an MKV file into it and it accepted it I was very surprised.
    I have gone through the menu and cannot see where acceptable audio codecs are listed.

    The video files are 720 or 1080, entered into the TV by way of a thumb drive and are accessed through the remote's "Multimedia" button.

    How do I find out what audio codecs are accepted by the TV?

    OK, will that give us enough to get started with?
    Last edited by 1voyager1; 2nd Jan 2017 at 13:17.
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  6. Use MediaInfo to determine the audio and video codecs (problems with the video codec can cause audio problems too). Use text mode in MediaInfo (View -> Text) then cut/paste into a message here.
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  7. OK, here is the MediaInfo text file for that video:

    General
    Unique ID : 211026911985641282490607912847662307987 (0x9EC24E0D0A309D1DA7D5647FC5F6DA93)
    Complete name : C:\Users\Solo-1\Desktop\Video 01.mkv
    Format : Matroska
    Format version : Version 4 / Version 2
    File size : 1.76 GiB
    Duration : 1 h 52 min
    Overall bit rate mode : Variable
    Overall bit rate : 2 244 kb/s
    Encoded date : UTC 2016-12-29 05:16:55
    Writing application : mkvmerge v9.4.0 ('Knurl') 32bit
    Writing library : libebml v1.3.4 + libmatroska v1.4.5

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4.2
    Format settings, CABAC : Yes
    Format settings, ReFrames : 4 frames
    Codec ID : V_MPEG4/ISO/AVC
    Duration : 1 h 52 min
    Bit rate mode : Variable
    Bit rate : 2 000 kb/s
    Maximum bit rate : 62.5 Mb/s
    Width : 720 pixels
    Height : 384 pixels
    Display aspect ratio : 1.85:1
    Frame rate mode : Constant
    Frame rate : 23.976 (24000/1001) FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.302
    Stream size : 1.55 GiB (89%)
    Writing library : x264 core 148 r2638 7599210
    Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=18 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=16 / lookahead_threads=1 / sliced_threads=0 / slices=4 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=1 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / vbv_maxrate=62500 / vbv_bufsize=78125 / nal_hrd=vbr / filler=0 / ip_ratio=1.40 / aq=1:1.00
    Default : Yes
    Forced : No
    Color range : Full
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.709

    Audio
    ID : 2
    Format : AC-3
    Format/Info : Audio Coding 3
    Mode extension : CM (complete main)
    Format settings, Endianness : Big
    Codec ID : A_AC3
    Duration : 1 h 52 min
    Bit rate mode : Constant
    Bit rate : 256 kb/s
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 44.1 kHz
    Frame rate : 28.711 FPS (1536 spf)
    Bit depth : 16 bits
    Compression mode : Lossy
    Delay relative to video : 24 ms
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  8. I don't see anything there that looks like it would be a problem. What do you mean by "garbled"? Is it just an occasional chirp or is it continuously bad? Can you recognize the audio at all?

    Try a quick remux with mkvtoolnix. Just open the video and save as a new video.

    Also, as a test, try muxing the audio with another video, one that plays normally. See if the problem follows the audio or the video.
    Last edited by jagabo; 2nd Jan 2017 at 15:59.
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  9. Member awgie's Avatar
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    Originally Posted by 1voyager1 View Post
    2.
    The TV is a JVC SP55M-C.
    I believe that it does auto firmware updates.
    The first time I loaded an MKV file into it and it accepted it I was very surprised.
    I have gone through the menu and cannot see where acceptable audio codecs are listed.

    The video files are 720 or 1080, entered into the TV by way of a thumb drive and are accessed through the remote's "Multimedia" button.

    How do I find out what audio codecs are accepted by the TV?

    OK, will that give us enough to get started with?
    Page 32 of the user manual says the following:
    The TV is capable of photos, music and video playback. However, due to the wide variety of multimedia file formats. Some formats may not be supported.
    Unfortunately it doesn't say which formats are supported.

    However, according to the FAQs for JVC TVs (http://www.jvc-tv.com/faq/), they only support .MP4 files, so the fact that it would play an .MKV file at all is indeed a surprise. I suspect this is the root of your problem.

    According to the user manual for that TV (page 55, "Audio Technology"), it does do Dolby audio, which is what AC3 is, so if you use a program such as AviDemux or maybe ffmpeg to take the AVC video stream and the AC3 audio stream and simply put them into an .MP4 container, you should be able to play the file just fine without needing to completely re-encode it.
    Do or do not. There is no "try." - Yoda
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  10. Sorry for disappearing for so long. Other more pressing matters came up.

    I tried converting the video to MPEG4, then XVID .mp4, and the audio to mp3 in both cases.
    No satisfaction.
    Audio still garbled.
    Distorted may be a better term.

    I found another copy from another source and tried it.
    It works just fine on both PC and TV.

    MediaInfo text file for video 02:
    General
    Complete name : C:\Users\Solo-1\Desktop\Video 02.avi
    Format : AVI
    Format/Info : Audio Video Interleave
    File size : 1.36 GiB
    Duration : 1 h 52 min
    Overall bit rate : 1 736 kb/s
    Writing library : VirtualDub build 32593/release

    Video
    ID : 0
    Format : MPEG-4 Visual
    Format profile : Advanced Simple@L5
    Format settings, BVOP : 2
    Format settings, QPel : No
    Format settings, GMC : No warppoints
    Format settings, Matrix : Default (H.263)
    Muxing mode : Packed bitstream
    Codec ID : XVID
    Codec ID/Hint : XviD
    Duration : 1 h 52 min
    Bit rate : 1 343 kb/s
    Width : 720 pixels
    Height : 384 pixels
    Display aspect ratio : 1.85:1
    Frame rate : 23.976 (24000/1001) FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Compression mode : Lossy
    Bits/(Pixel*Frame) : 0.203
    Stream size : 1.05 GiB (77%)
    Writing library : XviD 66

    Audio
    ID : 1
    Format : AC-3
    Format/Info : Audio Coding 3
    Mode extension : CM (complete main)
    Format settings, Endianness : Big
    Codec ID : 2000
    Duration : 1 h 52 min
    Bit rate mode : Constant
    Bit rate : 384 kb/s
    Channel(s) : 6 channels
    Channel positions : Front: L C R, Side: L R, LFE
    Sampling rate : 48.0 kHz
    Frame rate : 31.250 FPS (1536 spf)

    I've used video 02 and deleted 01.
    I don't know enough to see why one works and the other doesn't.

    Thank you for your help on this folks.
    You've given me some useful information I can use in the future, even if I haven't used it all now.
    Last edited by 1voyager1; 5th Jan 2017 at 15:21.
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  11. Member awgie's Avatar
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    Originally Posted by 1voyager1 View Post
    Sorry for disappearing for so long. Other more pressing matters came up.

    I tried converting the video to MPEG4, then XVID .mp4, and the audio to mp3 in both cases.
    No satisfaction.
    Audio still garbled.
    Distorted may be a better term.
    The video was already MPEG4 format
    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4.2
    Format settings, CABAC : Yes
    Format settings, ReFrames : 4 frames
    Codec ID : V_MPEG4/ISO/AVC
    • When you did these 2 conversions, what were the steps you performed?
    • What software did you use?
    • Did you put them back into an MKV container, or leave them as .MP4?
    • Did the resulting MP3 audio sound OK on your computer?
    I've used video 02 and deleted 01.
    That's unfortunate. It would be nice to try other things out on Video 01.

    Specifically, I noticed that the audio showed the A_AC3 codec, and that may be what is messing it up. A_AC3 is specific to Matroska (.mkv) files. Normal AC3 is BitStreamID 8, but A_AC3 also allows for BSID9 & BSID10, which break decoder compatibility. Your audio may in fact be BSID8, but showing A_AC3 as the codec may be throwing everything off.

    Your TV may not be compatible with it, and the software you used to convert it to MP3 may also not be reading it correctly, resulting in the MP3 also being messed up.

    I found another forum thread mentioning having problems with A_AC3 audio, and the suggestion was made to try MKV2AC3. Unfortunately, the OP never updated whether it was successful.
    Do or do not. There is no "try." - Yoda
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