Converted mkv to mp4; some play, some don't

Discussion in 'iPad Tips, Help and Troubleshooting' started by brian.leveille, Oct 8, 2010.

  1. macrumors newbie

    Joined:
    Mar 17, 2007
    Messages:
    16
    #1
    I've used mkvtools to extract and re-mux some mkvs and mp4s. 2 out the 3 I've tried actually worked great and look good on the ipad.

    The 3rd one won't sync over. Can someone take a look at this media info output and tell me the ipad is rejecting it?


    General
    Complete name : foorbar.m4v
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom
    File size : 557 MiB
    Duration : 21mn 6s
    Overall bit rate : 3 688 Kbps


    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4.1
    Format settings, CABAC : Yes
    Format settings, ReFrames : 8 frames
    Format settings, GOP : M=5, N=32
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 21mn 6s
    Bit rate mode : Variable
    Bit rate : 3 253 Kbps
    Maximum bit rate : 26.9 Mbps
    Width : 1 280 pixels
    Height : 720 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 23.976 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.147
    Stream size : 491 MiB (88%)
    Title : foobar.h264 - Imported with GPAC 0.4.6-DEV (internal rev. 5)
    Writing library : x264 core 105 r1732 2b04482
    Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=6 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=4 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=3253 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
    Encoded date : UTC 2010-10-07 17:53:40
    Tagged date : UTC 2010-10-07 17:54:10

    Audio #1
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format version : Version 4
    Format profile : LC
    Format settings, SBR : No
    Codec ID : 40
    Duration : 21mn 6s
    Bit rate mode : Variable
    Bit rate : 264.6 Kbps
    Maximum bit rate : 752 Kbps
    Channel(s) : 6 channels
    Channel positions : Front: L C R, Side: L R, LFE
    Sampling rate : 48.0 KHz
    Stream size : 40.3 MiB (7%)
    Title : /foobar.tempAudio.t0.aac:lang=unknown - Imported with GPAC 0.4.6-DEV (internal rev. 5)
    Encoded date : UTC 2010-10-07 17:54:02
    Tagged date : UTC 2010-10-07 17:54:10

    Audio #2
    ID : 3
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format version : Version 4
    Format profile : LC
    Format settings, SBR : No
    Codec ID : 40
    Duration : 21mn 6s
    Bit rate mode : Variable
    Bit rate : 156 Kbps
    Maximum bit rate : 302 Kbps
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 48.0 KHz
    Stream size : 23.5 MiB (4%)
    Title : /foobar.mkv.tempAudio.t0.added.aac:lang=unknown - Imported with GPAC 0.4.6-DEV (internal rev. 5)
    Encoded date : UTC 2010-10-07 17:54:07
    Tagged date : UTC 2010-10-07 17:54:10
     
  2. SR2
    macrumors regular

    Joined:
    Oct 3, 2010
    Messages:
    114
    #2
    I'm not sure the ipad can handle high profile x264 video with 8 reference frames and b pyramid. You probably have to convert it to play on the ipad.
     
  3. macrumors 6502

    pruppert

    Joined:
    Jan 30, 2008
    Messages:
    275
    #3
    You might check out the Zumocast app. It's free and streams a transcoded version to the iPad from your computer. I discovered it today and am liking it so far.
     
  4. macrumors 65816

    Joined:
    Oct 28, 2007
    Messages:
    1,186
    #4
  5. macrumors regular

    bassanoclapper

    Joined:
    Mar 4, 2008
    Messages:
    231
    Location:
    London
    #5
    VLC for iPad
    No conversion necessary
     
  6. macrumors newbie

    Joined:
    Jul 12, 2009
    Messages:
    4
    #6
    This is the problem. The iPad only supports up to Main profile 3.1.

    I have yet to find a quick way around this so had to resort to converting with Air Video or Handbrake.
     
  7. macrumors member

    Joined:
    Jul 7, 2008
    Messages:
    94
    #7
    The High@L4.1 is indeed the problem. Which version of MKVtools are you using? The newest version does a better job of changing the profile level, which needs to be 3.1, so you might want to give it a try. BTW, MKVtools will work with mp4 videos, so you don't need to reprocess the original video. Just passthru the video and audio with the device set to iPad. It should be a fairly quick process.
     
  8. macrumors newbie

    Joined:
    Mar 17, 2007
    Messages:
    16
    #8
    emmgunn,

    Yes, I just upgraded to the lastest version of mkvtools and it's MUCH better than the old version I was using. The "add stereo audio track" checkbox rocks in that I will have a single file that'll play on both the ipad and soon to arrive in the mail AppleTV2.

    I'll definitely be registering the product.

    Thanks!

    -BL
     
  9. macrumors member

    Joined:
    Jul 7, 2008
    Messages:
    94
    #9
    Hi Brian,
    Just so you know, there is a bug with the dual audio that is preventing the ATV from seeing the second audio track. I've got the fix, I just need to code it. Hopefully there will be an update in a day or two.
     
  10. macrumors member

    Joined:
    Jul 7, 2008
    Messages:
    94
    #10
    FYI. Version 2.4.1 is now out, which hopefully fixes the dual audio track issue.
     
  11. macrumors newbie

    Joined:
    Mar 17, 2007
    Messages:
    16
    #11
    Emmgunn,

    I just got my atv2 in the mail today. I ran a few mkv's through 2.4.1 and can't get 5.1 to work. Both tracks playback as 2.0.

    My settings are:

    video: passthrough
    audio: aac5.1 (and add extra 2.0 track)
    device: ipad


    Should I select a different device type? I select ipad because I'm hoping that the same file will playback on both my new atv2 and my new ipad.

    Thoughts?
     
  12. macrumors newbie

    Joined:
    Mar 17, 2007
    Messages:
    16
    #12

    I take that back. I just re-did one and select ac3 - 5.1 (and add 2nd audio track).

    It plays back just fine in 5.1 on the new atv2!

    Yay!
     
  13. macrumors regular

    Joined:
    Sep 27, 2008
    Messages:
    124
    Location:
    Bolton, UK
    #13
    Will this only Mux on a mac?
     

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