No Audio on Some MP4 VideosSupport


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  1. Scary

    Scary Well-Known Member This Topic's Starter

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    I use a little application on my computer called iPlayer Downloader. Basically it lets me download BBC iPlayer programmes as either mp3 or mp4 files.

    However when I copy one of the mp4 files to my Desire it plays but without audio. I've tried other mp4 files - one downloaded direct from YouTube and another via ZamZar and they work (as do the mp3's it produces of radio shows)

    Looking at the details of the files on Quicktime it gives me these details:


    Clip that doesn't work:
    H.264, 483 x 272, Millions
    AAC, Stereo, 48,000 kHz
    FPS: 25.00

    Clip that works:
    AAC, Stereo (L R), 41.100 kHz
    H.264, 352 x 264, Millions
    FPS: 24.94

    Another:
    MPEG-4 video 640 x 360, millions
    AAC, Stereo 9L R), 48000 kHz

    I assume it's something to do with the audio format, but on the above the only difference on the non-working one is the Stereo format

    Any ideas anyone?
     

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  2. SUroot

    SUroot Well-Known Member Developer

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  3. Scary

    Scary Well-Known Member This Topic's Starter

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    I will try Handbrake after seeing it recommended elsewhere on this forum. I'm wondering if it can take a mp4 file and output a different type of mp4 file though?
     
  4. SUroot

    SUroot Well-Known Member Developer

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    The h.264 is the video format and the audio format can be whatever you want and it will still be an .mp4 extension. You don't need to fix the video in the file, just the audio which is encoded separately within the same file.

    EDIT>

    Outputs:


    • File format: MP4 and MKV
    • Video: MPEG-4, H.264, or Theora
    • Audio: AAC, CoreAudio AAC (OS X Only), MP3, or Vorbis. AC-3 pass-through, DTS pass-thorugh (MKV only)
     
  5. Scary

    Scary Well-Known Member This Topic's Starter

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  6. SUroot

    SUroot Well-Known Member Developer

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    Yes, that was me earlier in this thread :$
     
  7. Scary

    Scary Well-Known Member This Topic's Starter

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    What was? :confused:
     
  8. SUroot

    SUroot Well-Known Member Developer

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  9. Scary

    Scary Well-Known Member This Topic's Starter

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    Ooops, I think I brushed over that originally because of the mention of DIVX

    Thanks for you help
     
  10. Kryten2k35

    Kryten2k35 Well-Known Member

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    I've been using the handbreak program flawlessly. It's the best imho.
     
  11. jbhq

    jbhq New Member

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    any Win user with a prob playing IPlayer mp4 on Android can ...
    download/install MP4Box to <x>
    create bat file below in folder <x>
    move downloaded mp4s to <x>
    run bat file
    copy to phone

    involves no transcoding:)

    batch file - lists mp4s and then processes by splitting/joining video/audio)

    copy from next line >>>
    dir *.mp4 /b > mp4list.txt

    for /f "delims=." %%a in (mp4list.txt) do (

    MP4Box -raw 1 "%%a.mp4" -out "%%a.h264"
    MP4Box -raw 2 "%%a.mp4" -out "%%a.aac"
    MP4Box -fps 25 -add "%%a.h264" -add "%%a.aac" -new "%%a.mp4"

    del "%%a.h264"
    del "%%a.aac"
    )
     
  12. Brucew0617

    Brucew0617 Banned

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  13. SUroot

    SUroot Well-Known Member Developer

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    This issue is old and resolved. We are in the HTC desire forum.
     

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