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Sujet: MPEG 4 problem tonight (major) - Page: 1

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I've been testing mpeg4's at home using the little window on my monitor. Man, it worked great, played for hours without any problems. One thing I forgot was to actually try the TV out.

Well, tonight doing a test run in the club for next week I actually hooked it up right, did the video out to tv's. I could get audio out with mpeg4 but not video. The little window in VDJ kept saying "loading", so it wasn't even play in the program window. NOW, if I redid the from the tv to the monitor, it adjusted and worked.

I tried unclicking the hardware excelleration button and then the mpeg4 video worked both in VDJ and over the tv's HOWEVER, the video was all jerkey and when I re-selected hardware excelleration the VDJ actually froze and I had to do a contro/alt/delete.

Any ideas? Anybody actually tried to play mpeg4 over tv's or projector? I'm thinking about doing an emergency conversion from mpeg4 to mpeg2.

Oh, by the way, mpeg1, mpeg2, and vob's all worked perfect.
 
Posté Fri 20 Apr 07 @ 4:47 am
Shame that happened Doc. Definately noticed that mp4s take more cpu than mp2s, etc. I know on my machine i don't dare to play them untill they've fully loaded.

For the first time tonight I tried putting my mp4s onto a tv screen (putting a little demo together), didn't seem to have too many problems, but the lips definitely weren't in sync!

Might be worth converting just so you know it will work all the time. It's a shame though, more hassle! Hopefully they'll support mp4 natively soon.
 
Yea Andy, don't know why I had that problem. I feel stupid that I didn't try over a tv at home first. Unless I hear something different, I'm converting the mpeg4 to mpeg2. I also didn't think about the cpu usage either.
 
That seriously sux. Conversion takes ages! Hope all goes well in future.
 
A lesson learned.

After I played around with mpg4 I came to the conclusion its not worth it at all. I'll just keep adding drives to my rig and stick to mpeg-2, fast easy clean low overhead. Mpeg-1 is a close second. I've tired them all mpeg-2 is still king at least in my book. Unless we see hardware decode of h264 on video cards it will stay that way for years to come.
 
Actually conversion from mpeg4 to mpeg2 isn't real bad. I'll do it during the night.
 
which conversion software do you guys recommend ??? Presently I use Sony Vegas 6.0a for all video rendering which doesnt have the mpg2 option, by the way, can i acquire a plugin from sony to render vidz to mpg2.
 
"Actually conversion from mpeg4 to mpeg2 isn't real bad. I'll do it during the night"

It's bad in the sense you are taking a file that's been compressed with M-4, you lost quality in that process. You will end up with a larger file with the quality of a compressed file.

If you have the original .vob's I'd go back to that point or convert them to DIVX and you won't be increasing the file size for nothing and they will play fine. :^)



 
I'm thinking of converting my mp4s (from my12inch.com). Any thoughts on what format would be best (divx, mp1 or mp2)? Here's the media info for a file i recently got:

Format : MPEG-4
Format/Info : ISO 14496-1 version 2
Format/Family : MPEG-4
File size : 65.9 MiB
PlayTime : 4mn 17s
Bit rate : 2146 Kbps
StreamSize : 107 KiB
Movie name : That's That
Album : www.my12inch.com
 
Had a similar problem. Cahnged the codec from video decoder to windows media video decoder. Then it worked.

Hearing great things about mpeg4. Bought DivX, ripped a few vobs using that codec. Ugh. Blotchy, clumpy video, close up, or at a distance. Tried TMPEG-4. Sameo. Tried AVS. Sameo. Sticking with the vobs until somebody gets it right (and simple).
 
Thing is cap, no one has got it right yet. Divx is good if you match the bitrate of the vob files but then you really don't save any space, mpeg-4 is about the same way, but with a high cpu overhead and not able to be played from the faster vdj decoder. H264 hey if you got 6 hours to put into one track go for it. It took me 2 hours to encode a 30 second spot. and the cpu is maxed out when playing back in media player! Mpeg-2 still the best when it comes to time is money and space is cheap.
 
I agree with Cyder. Space don't mean anything to me either. I want the files to look good and play efficiently in VDJ.

Now, I converted the mpeg4 to mpeg2 and the video quality is crap. I used 25 frames per second and a video bitrate of 2496 kbps, using the MEncoder.

Any ideas to help improve quality?

BTW Renee, I have no choice, I can only get mpeg4, and VDJ crashed for me and wouldn't play the video over a tv or projector.
 
OK here some help
I've used VDJ 2years at a club with 10 TV's Make sure you have the newest Codex also your Video card is 128 or more i use a 256Meg ati card never have trouble Sometimes and Voice is out of time little bit not bad just sec or 2 try this and see if it helps any
DJ Jim Owner
Lasertunes Entertainment
www.myspace.com/djjim65
www.myspace.com/tailg8tors
 
Jim, are you running mpeg4's? If so, which codec are you using?
 
hey ppl am new here and i have a question

does virtual dj let u record videos like how u can record audio

cause it tells me that mpg4 codec is not found so can i get some help pls
 

I must have missed something here.

I'm using MP4's and I'm experiencing no problems (even when using an external monitor).

They load up quick and play smoothly (sizes from 60mb - 140mb)

I use MP4's because that's what the download services provide, if I was ripping from DVD's I'd go with Mpeg2 for quality reasons only.


System Specs:

1.66ghz Core 2 duo
2gb Ram
Vista
300mb Shared graphics card (intel).
 
andytaylor125 wrote :
I'm thinking of converting my mp4s (from my12inch.com). Any thoughts on what format would be best (divx, mp1 or mp2)? Here's the media info for a file i recently got:

Format : MPEG-4
Format/Info : ISO 14496-1 version 2
Format/Family : MPEG-4
File size : 65.9 MiB
PlayTime : 4mn 17s
Bit rate : 2146 Kbps
StreamSize : 107 KiB
Movie name : That's That
Album : www.my12inch.com


the problem with my12inch.com is the codec they use (or at least used to when I was a member) it is a 3ivx codec which as I have been told is a version of divx...but not quite and it did always have problems for me with vdj.

I rip all my videos now with h264 (FFDSHOW codec, it's free) and have been for over a year and I have no problems whatsoever. Did some tests with the same videos from the same dvd ripped to mpeg2 and there is no loading speed difference (the mp4 is actually a hair faster) and I have my config set to "internal video decoder".

Rip your videos with h264 at 7000kbs just as the mpeg2s are and there is NO compression from the original DVD and the quality of video is IDENTICAl but the audio is actually better as you can rip the audio in either full wav (LPCM) or AAC 320kbs which is FAR superior to mp3 320kbs.
 
andytaylor125 wrote :
I'm thinking of converting my mp4s (from my12inch.com). Any thoughts on what format would be best (divx, mp1 or mp2)? Here's the media info for a file i recently got:

Format : MPEG-4
Format/Info : ISO 14496-1 version 2
Format/Family : MPEG-4
File size : 65.9 MiB
PlayTime : 4mn 17s
Bit rate : 2146 Kbps
StreamSize : 107 KiB
Movie name : That's That
Album : www.my12inch.com


XviD for the video, keep the aac audio so you don't lose time transcoding and so there's no quality loss, and put them in an mp4 containers. Mencoder will be able to do all this with one/two commands depending on your settings.
 
DJ Doc Z wrote :
I agree with Cyder. Space don't mean anything to me either. I want the files to look good and play efficiently in VDJ.

Now, I converted the mpeg4 to mpeg2 and the video quality is crap. I used 25 frames per second and a video bitrate of 2496 kbps, using the MEncoder.

Any ideas to help improve quality?

BTW Renee, I have no choice, I can only get mpeg4, and VDJ crashed for me and wouldn't play the video over a tv or projector.


Standard video is 29.9 frames per second (usually listed as either 29 or 30 in most software). Some compression uses 25 frames per second to keep the same bitrate but cut the file size by about 16 %. Sort of the equivalent of going into a movie frame by frame and editing out every 6th frame, to most people you won't notice a difference, but if your eyes are fast enough with motion sensitivity you can actually see some "strobing" or choppiness......use 29 frames per second, that's what the human eye percieves as smooth motion.

mp4 depends primarily on the CODECs used to encode / decode and they generally work flwlessly if you are using the same codec to encode as decode. I use the (FFDshow free H264...actually X264 as it is an open source rather than proprietary coding) and encode at 7000kbs which is EXACTLY identical VIDEO file with NO compression from the original DVD. For audio I use the 320kbs AAC or AC3, whichever your software uses, both are FAR supperior to the 320kbs mp3 (most will also give you the option to use LPCM which is the same as .wav).

For all your conversions get a program called "ANY Video Converter free version" http://www.any-video-converter.com/products/for_video_free/ I have been using this recently and it does a wonderful job and is quite fast actually.

Whenever converting from one source to another if you don't want compression use the same bitrate as your original (2496 is WAAAAY to low for ANY video format to be used on external monitors, about 4000kbs with H264 is the lowest you can go without noticing any compression and with mpeg2 you will be able to notice it at about 6000kbs
 
dj-e-lectric wrote :
Standard video is 29.9 frames per second (usually listed as either 29 or 30 in most software). Some compression uses 25 frames per second to keep the same bitrate but cut the file size by about 16 %. Sort of the equivalent of going into a movie frame by frame and editing out every 6th frame, to most people you won't notice a difference, but if your eyes are fast enough with motion sensitivity you can actually see some "strobing" or choppiness......use 29 frames per second, that's what the human eye percieves as smooth motion.

mp4 depends primarily on the CODECs used to encode / decode and they generally work flwlessly if you are using the same codec to encode as decode. I use the (FFDshow free H264...actually X264 as it is an open source rather than proprietary coding) and encode at 7000kbs which is EXACTLY identical VIDEO file with NO compression from the original DVD. For audio I use the 320kbs AAC or AC3, whichever your software uses, both are FAR supperior to the 320kbs mp3 (most will also give you the option to use LPCM which is the same as .wav).

For all your conversions get a program called "ANY Video Converter free version" http://www.any-video-converter.com/products/for_video_free/ I have been using this recently and it does a wonderful job and is quite fast actually.

Whenever converting from one source to another if you don't want compression use the same bitrate as your original (2496 is WAAAAY to low for ANY video format to be used on external monitors, about 4000kbs with H264 is the lowest you can go without noticing any compression and with mpeg2 you will be able to notice it at about 6000kbs


Standard video is 24 (23.976) fps. If it's 29.97 it's been telecined as your video signal in the USA is 60hz, 59.97fps is closer to this than 47.952, 3:2 pulldown is applied to remove the duplicated frames at virtually no loss in motion sensitivity. People also don't go from 29.97 to 25 to save 16%, PAL uses 25 fps, that's the difference.

Also you maintain that encoding your files at 7000kbps is lossless, it really isn't. H.264 does have a lossless option, but to be lossless you lose and setting over the bitrate and end up with a larger file than you started with. Lossless with all formats is only used for the intermediate stage when editing a video.
 
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