Sign In:     

Forum: General Discussion

Topic: bad sound off video files

This topic is old and might contain outdated or incorrect information.

Why is the sound so variable from video to video? i understand songs have different mixes but doing an A n B test with the video track on one side and the audio ripped CD on the other it is apparent no only is there a recording mix difference but also a peak in frequencies on the video!!

So as an experiment I re-edited a video track putting a 320 bit audio sound track then rendered it as a MPEG4 at 720. This was better but no where near right compared with the 320 audio track the video had a lack of depth and clarity?

Is this a codec problem within virtual DJ? ...and what is the cure as 98% of my show is now video based, i can't compromise sound quality just because it's a video? i am constantly pulling out frequencies on different videoss just to sweeten the sound and stop it making it your ears bleed (1.6k 2k and 6k seem to spike more often on video's)

So if i take a great sounding song playing on one deck and the same song re-recorded as a video mt2 or mpeg4 on the other deck ...and compare them ...then the sound is like chalk and cheese. Why?

It must be a codec issue ...please help
 
Posted Sun 11 Mar 12 @ 7:17 am
What are your source video files? Are you using .vob's ripped from a DVD? .avi's from a download, youtube videos. Reediting an existing track that was at say 128bit to a 320bit will not work, the information was already lost. I have no problem with video files if I rip/convert them with the proper audio settings.
 
What is the best configuration the audio of video files?What is the best format video and audio to VDJ?
 
The best is what you can get. When I stated out, I did vob, because that was PromoOnly. I had to rip the file, and vob was the best quality. Now they offer mpeg4, and all I have to do is copy and paste. The other download services offer the same, so that is what I get. You could search for HD, but know one has ever said to me "your videos look terrible". Now I have seen others use YouTube and other less than quality sources, and they look terrible.
 

320kbps AAC should sound good if the source file is decent, ideally lossless but if you have to transcode from 320kbps MP3 to AAC the change shouldn't be noticeable.

Unlike the competitors VDJ supports MKV which is compatible with Flac so you could have a lossless audio stream (if you're editing them yourself).
 

As the others pointed out, it also depends on your main source for music videos (there's more bad sites than good).


The audio stream should also be 44.100kHz if that is the spec of the original audio file, so many people do everything to DVD standard thinking it's best...
 
yes i understand about the source having to be the best and i understand about sample rates ...but here's the rub, the system i use is all active with bss crossovers, amcron amps, EMO eq and JBL loaded concert rig with 18's 12's and 2" on the top so you hear eveything. This is good and bad because a bad video sounds terrible.

So to take it one step further i re-recorded some video tracks using both MP3 at 320 and aac. The track was then rendered as and MPEG4.

i had the original MP3 sampled at 320 on one side and the re-recorded MPEG4 on the other ...now the sound output should be identical? but it isn't ...there is an inferior sound coming from the MPEG4? whether i use mp3 or aac to re-record!. It isn't the media program because it is adobe and used to make TV programs.

so why is there a sound difference? is it a codec issue? with Virtual DJ not aquiring the correct codec and defaulting to a generic codec which still plays but at a lower quality?

It needs sorting somehow
 
birty1 wrote :
i had the original MP3 sampled at 320 on one side and the re-recorded MPEG4 on the other ...now the sound output should be identical? but it isn't ...there is an inferior sound coming from the MPEG4? whether i use mp3 or aac to re-record!. It isn't the media program because it is adobe and used to make TV programs.

You have so much FAITH in ADOBE it is not because it is used to make TV programs it means it is perfect some other video freaks can even make a full high quality movie using the FREE softwares out there. See the logic is simple you can't compare APPLES harvested from California and the APPLES harvested in BRAZIL it may have different taste although they are both the same APPLES the reason that contributes to your problems is the SOURCE files try to record a video with the same sources using different video codecs remember that each one of them has the variation in quality for both audio and video conversion example in MPEG4 you can have higher conversion and also lossy conversion. Take note that theres no higher quality that is more than the original source if your source is bad you can't do anything by just doing a plain conversion because theres no magic tricks on it, unless you have to spend money to remake the whole thing and resampled everything using those expensive equipment that is available in the movie studio like hollywood.

birty1 wrote :
so why is there a sound difference? is it a codec issue? with Virtual DJ not aquiring the correct codec and defaulting to a generic codec which still plays but at a lower quality?

Sounds difference is from the codec issue each codec uses their default audio and video sittings and in virtual dj i don't know how it handles each different video & audio formats but it could be converted to resides VDJ video and sounds engines standard compatible formats to avoid complications. And for my observation VDJ has a very good sound engines to handles this different video and audio formats. Your issues are lying somewhere in your side you have to analyzed in which way you could make the improvements. Try to use converter that could tweak your sound setting while converting your video like a medium quality video but sounds can tweak a bit higher.
 
@Birty,
I was wondering if you happened to ever end up with an answer to your question. I have definitely noticed a difference in audio quality from videos i get from pools I belong to versus a 320kb MP3. For videos that I've gotten DVD and ripped myself, I don't notice the difference so much. What I have taken to doing (where possible, since some of these videos are different mixes than I have found on a decent audio track) is demuxing the MP4 files, splitting the audio file from the video file from the MP4 container. With a bare h.264 video encoding, I can then remux it with any audio track I prefer, using an MP4 or an MKV container file, depending on what audio I use. Drawback is... this is fairly user intensive; you'll generally have to manually line up the audio and the video, so that they sync properly. The key to this working so well, is that there is no conversion process. the video itself remains untouched, and the audio you sync to the video does as well. they are just put into a container file together with sync information. ( think .zip file, but video specific. Thats how video files actually work) There are a number of free apps around for muxing mp4 and mkv files. I have had good luck with YAMB. :) Hope that this has been helpful, and happy editing.
 


(Old topics and forums are automatically closed)