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  1. #1
    Sherman is offline Senior Member Always Around
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    Default MP4s... a problem?

    Hey guys,

    Sorry to ask what's probably a stupid question, but here we go. I tried to search for "mp4" before posting, but unfortunately that's such a "small or common" search term that it got removed from the search terms. And I don't see anything relelvant on the first couple of pages here...

    So anyway... recently I'm noticing a few places changing to prefering to encode in this newfangled MP4 format rather than the old AVI or whatever. My problem is basically this: they never work for me. At least, not well. I often get a lag before it actually starts, and then when it's playing, the video will occasionally freeze or block right the hell up for a time. Also, scrolling to different parts of the file is often impossible. Instead, the file just pauses and never seems to pick back up again.

    I'm using the latest VLC player as I've heard good things. My computer is nothing flash, but I'd find it a bit strange if it was struggling just to play a video file. And the thing that gets me the most is, the video files always freeze AT THE SAME PLACE. It's like there's certain parts of the file which just DON'T WORK. They're not particularly action-packed scenes or anything, just random segments that won't work. If I scroll past them (once the file picks back up), it'll work fine again. But then if I scroll back into the problem area again, it'll freeze back up. And these areas stay consistent no matter how many times I play the file.

    So, I wonder, could the files be corrupt or something? It only happens to me with mp4, and yet it happens with nearly every mp4 that I get. Could it be that mp4 is just an unreliable format? Considering it's so specific, I have a hard time thinking it's a fault with the computer. But then, you never know...

    Anyway, anyone have similar issues?

  2. #2
    Jakko's Avatar
    Jakko is offline Senior Member Community Builder
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    Could you list Processor? OS? Any codecs you have installed?
    Also, are all files(even different kinds) stopping at the same place on the player, or are you talking about the same files stopping at the same place with different players?

  3. #3
    Volvogga's Avatar
    Volvogga is offline Senior Member Always Around
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    Well first off, VLC has subtitle issues (unless they finally got off their dead ass and fixed it), so for future reference, might want to go with another player (although the only other real player that doesn't take external codecs is Mplayer, and to use that in windows you need to run the command line version).

    Next thing is that MP4, far as I know, I believe is a container format. AVI is defiantly a container format. Basically, what that means is that it's a file that wraps multiple files together (kinda like a ZIP, but acts differently). So what that means is that you have 'streams' within the container. You have your video stream, which can be encoded in a number of formats (Xvid, H264, etc.), Audio (MP3, AAC, Vorbis, etc.), Subtitles, sometimes even fonts and things.

    So in addition to what Jakko requested, I'd like to know what program you are using to encode, as well as what video codec and audio codec being used.

    Also, are you leaving the computer unattended when you encode? Is there anything else you are running during the encode that could possibly cause a hickup in the encoding process?


    EDIT:
    Oh, one other thing... is this ANY MP4, or is this only the MP4s you encode yourself?
    Vol~

    thanks to Silverwmoon!

  4. #4
    Sherman is offline Senior Member Always Around
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    OK, cheers for the help guys. Here's the answers:

    First, I have never encoded anything in my life. Sorry if I led you astray there. I'm just talking about shows I download. Specifically, the shows I've had the big problems with (which I can remember) are Jigoku Shoujo and Higurashi no Naku Koro ni.

    I get what you mean about the "container format", I think. And it might be worth saying that the audio stream is usually alot more reliable than the video stream - at least in terms of freezing. And blocking, I guess, since audio can't really do that Sometimes the audio will continue happily away while the image just locks in a certain place.

    And Jakko, I mean that with a certain file, that file tends to freeze at the same place. The freezing spot changes from file to file (some don't even have one! - though that's super rare), but whenever I play that particular file, the same segment is always the troublesome bit.

    I'm using VLC, yeah, but never had any subtitle issues, except for the fact that sometimes you have to turn them on (they default to Off). And as far as I know, it doesn't use codecs. Like I say, I'm not actually encoding anything.

    As for my specs, I'm not too hot on that, but here's what I could find out. It's Windows XP SP2, and it's an Intel Celeron 2.50GHz with 256 MB RAM. How's that?

  5. #5
    Merlin7777 is offline Junior Member Newbie
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    Yes, MP4 is a container format. And totally rule out a few things I recommend getting your hands on

    Media Player Classic
    Haali Media Splitter
    FFDSHOW

    Those three files will allow you to play any file you come across.

  6. #6
    irecinius is offline Senior Member Community Builder
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    If a file stop on the very same place, might be download corruption.

    Do a CRC Check on them to see that you downloaded them correctly..
    Usualy the animes comes with [Group]Name_extended_[XXXXXXX].avi/mp4/mkv
    See the XXXX
    thats the crc32 (search google there are a couple of programs that check thoses)

    If the number that the program gives to you is different from the one that says in the filename, your download is corrupted.


    Now that we got Download corruption out of the way, means that the file is ok, but still crashes on the same place.

    You might have instaled CCCP, the codec pack, it comes with a pre-configured version of FFDSHOW.
    THat might be putting a strain on your computer, thats why it "lags" on certain parts, or maybe even stop completely.

    DBL-Click on the "FF video" icon, bellow, "Image Settings" there should be a bunch of options somes should be with a "check" on the right..
    Just disable them all off, clicking on the box, to uncheck them.

    Apply and ok..

    You probably going to see a difference on the video itself, colors, blurring and such.. but see if that the mp4 hangs on the same place
    "Chile is a thin and tall country"

  7. #7
    Digital_Eon's Avatar
    Digital_Eon is offline Super Moderator Community Builder
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    Probably won't really help, but mp4 is the iPod format, right? Maybe one of the Apple media players (QuickTime, right?) could solve the issue. It isn't really solving the problem with other media players, but it could at least help you watch what you need (if the files themselves aren't corrupted... which could be a possibility).
    ~Digital_Eon~




  8. #8
    LordMelkor is offline Senior Member Well Known
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    Quote Originally Posted by Digital_Eon View Post
    Probably won't really help, but mp4 is the iPod format, right? Maybe one of the Apple media players (QuickTime, right?) could solve the issue. It isn't really solving the problem with other media players, but it could at least help you watch what you need (if the files themselves aren't corrupted... which could be a possibility).
    although apple originally developed mp4 (afaik) their support for its extended features is pretty limited. So chances are VLC will probably do better than quicktime if it is a container problem.

    @Sherman
    Try changing the container format to mkv and see if your problems still occur, that way you will know if the problem is the container, or the encoding. You can find out how to change the container with a simple google search of somthing like "mp4 to mkv"

  9. #9
    Sherman is offline Senior Member Always Around
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    OK... I ran a CRC check on a couple of files, and they seem to be fine (though I'm still weirded out by them stopping at the same place each time).

    As for Quicktime, it outright refuses to play any of these files. They're not even accepted.

    I didn't have FFDshow, but I just downloaded it. I installed it... but now what? It doesn't seem to have actually installed a player. I just have a random bunch of files. I can access "configuration" for audio and video, but there doesn't seem to be any program I can actually PLAY anything with... do you have to utilise it through something else? I tried using Media Player Classic to run files after installing FFDshow, but it hadn't made a difference.

    Sorry if I sound like a complete computer idiot, but I kinda am. And it's too late and I'm too tired to care anymore. I want answers!

  10. #10
    LordMelkor is offline Senior Member Well Known
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    use the CCCP codec pack that installs ffdshow and other codecish stuff for you.

 

 
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