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  1. Hi, I can't open some .mp4 files downloaded from the internet using an old Notebook with Windows XP Service Pack 3.
    This happens only with a few files recently downloaded, before I hadn't any problem with any kind of video files...
    I tried different players (VLC, KMplayer,...), downloaded current Codecs, but without any result.

    On a different, more recent, PC with Windows 7 VLC can open these files correctly.

    Which could be the reason? Hardware too old, video drivers not upadated?

    Can you help me in finding the cause ? Thank you very much in advance and sorry for my bad english!
    Last edited by pippoismaele; 15th Oct 2014 at 03:51.
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  2. DECEASED
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    Probably you need to update the software players, because of D.A.S.H. :

    http://en.wikipedia.org/wiki/Dynamic_Adaptive_Streaming_over_HTTP
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  3. Thank you, but i dont't think it depends on software players. I am using the newest version of VLC, KMPlayer an others, and with the same players I can open the files on a different PC....
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  4. I'm a MEGA Super Moderator Baldrick's Avatar
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    Can you post the video details from one of the mp4s that wont work in vlc. Use mediainfo(view->text) or mediainfoxp.
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  5. These are the details of oneo of such files:

    Generale
    Complete name : D:\Profili\u084357\Documents\Collection\Chielaltro .mp4
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom
    File size : 444MiB
    Duration : 1o 36min
    Overall bit rate mode : Variabile
    Overall bit rate : 645 Kbps
    Encoded date : UTC 1970-01-01 00:00:00
    Tagged date : UTC 1970-01-01 00:00:00
    Writing application : Lavf52.94.0

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : Main@L3.1
    Format settings, CABAC : Si
    Format settings, ReFrames : 2 frame
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 1o 36min
    Bit rate : 511 Kbps
    Width : 720 pixel
    Height : 544 pixel
    Display aspect ratio : 4:3
    Frame rate mode : Costante
    Frame rate : 29,970 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bit
    Scan type : Progressivo
    Bits/(Pixel*Frame) : 0.044
    Stream size : 352MiB (79%)
    Writing library : x264 core 112 r1834 a51816a
    Encoding settings : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x1:0 / me=dia / subme=2 / psy=1 / psy_rd=0.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=3 / weightb=0 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=511 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.41 / aq=1:1.00
    Encoded date : UTC 1970-01-01 00:00:00
    Tagged date : UTC 1970-01-01 00:00:00

    Audio
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format profile : LC
    Codec ID : 40
    Duration : 1o 36min
    Bit rate mode : Variabile
    Bit rate : 128 Kbps
    Channel(s) : 2 canali
    Channel positions : Front: L R
    Sampling rate : 44,1 KHz
    Compression mode : Con perdita
    Stream size : 88,1MiB (20%)
    Encoded date : UTC 1970-01-01 00:00:00
    Tagged date : UTC 1970-01-01 00:00:00
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  6. I'm a MEGA Super Moderator Baldrick's Avatar
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    It should work in VLC.

    What happens in vlc? What is the error message?

    And some mp4s or other videos works?
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  7. With VLC 2.1.1 release I got the message "VLC does not support the audio or video format "undf". Unfortunately there is no way for you to fix this", after the upgrade to 2.1.5 VLC just doesn't open the file (the screen remains black).

    These are details of a file working (in red the main differences)

    General
    Complete name : D:\Profili\u084357\Documents\Collection\chielaltro _BIS.mp4
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom
    File size : 599 MiB
    Duration : 1h 36mn
    Overall bit rate mode : Variable
    Overall bit rate : 871 Kbps
    Writing application : Lavf55.50.100

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : Baseline@L3.0
    Format settings, CABAC : No
    Format settings, ReFrames : 1 frame

    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 1h 36mn
    Bit rate : 802 Kbps
    Width : 476 pixels
    Height : 360 pixels
    Display aspect ratio : 4:3
    Frame rate mode : Constant
    Frame rate : 25.000 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.187
    Stream size : 552 MiB (92%)
    Writing library : x264 core 142 r24 ea0ca51

    Encoding settings : cabac=0 / ref=1 / deblock=0:0:0 / analyse=0:0 / me=dia / subme=0 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=25 / scenecut=0 / intra_refresh=0 / rc_lookahead=0 / rc=crf / mbtree=0 / crf=25.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=2500 / vbv_bufsize=5000 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=0

    Audio
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format profile : LC
    Codec ID : 40
    Duration : 1h 36mn
    Duration_LastFrame : -10ms
    Bit rate mode : Variable
    Bit rate : 63.8 Kbps
    Maximum bit rate : 2 500 Kbps
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 44.1 KHz
    Compression mode : Lossy
    Stream size : 43.9 MiB (7%)
    Last edited by pippoismaele; 15th Oct 2014 at 04:39.
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