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28th October 2008, 15:21 | #1 | Link |
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AC3 vs Dolby Surround compatible MP3
Say there's this 3½ hour long DVD movie, of which I wanted to make a 2028 MB (1.98 GB) AVI.
Now I could have kept the 966 MB original AC3 audio, but that would've left only 1062 MB for the video part (including overhead), which isn't very much for 3½ hours. So I converted the AC3 to a Dolby Surround compatible (dplii) 160 kbps VBR MP3, which was only 210 MB, which in turn left a LOT of extra available MBs for the video part (VERY big difference there). Since I don't have mutant ears, this sounded just as good on my 2 speaker system, and since the MP3 is Dolby Surround compatible, I assume that friends with more advanced systems than mine would still get a surround signal, but (apart from not having separate center + LFE channels) would there be other real discernable differences? |
28th October 2008, 16:49 | #2 | Link |
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Personally.... I would have generated a 6Ch AAC-LC audio stream (at 160Kbps)
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28th October 2008, 17:44 | #4 | Link | |
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if you need a backup in avi format (aac is not supported in avi) with less than 2 GB (to be burn in standard DVD data) to be played by standard standalone players. For a 3½ hour long movie is a good choice. |
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28th October 2008, 19:04 | #5 | Link | |
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28th October 2008, 20:09 | #8 | Link | |
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Such players a really affordable nowadays and often come with card readers and USB inputs.
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28th October 2008, 20:16 | #9 | Link |
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I wonder what happened to Aud-X project. Site looks like not developed anymore. Quite pity, cause thanx to aud-x u can have surround mp3 in avi with DolbyPrologicII support at 192kb HQ profile. But as i recall, coding was taking more time than standard mp3, and probably aac gives better quality nowadays.
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28th October 2008, 20:55 | #10 | Link | |
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But there are new players with mkv support (Pop Corn, etc), that seems more interesting. Of course a Matroska file with x264 video and aac audio, or flac if we want the best quality, is the next future. And also store the files in external HDD NTFS with USB 2.0 conexion instead the old DVD, without size problems. But we are talking about the StickHorsie requirements. |
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28th October 2008, 21:15 | #12 | Link | |
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If we need a DirectShow filter to play the full surround ... Also there are multichannel vorbis maybe more eficient than mp3. |
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28th October 2008, 22:30 | #13 | Link | ||
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And yes, that was what I wanted to hear: that DPL II will do nicely if you want to spend more MBs on video quality, but don't want to lose the surround effect and still want full compatibility. Quote:
And hey, I might win the lottery and surround (pun not intended) myself with speakers one day. It's logical that reducing any file size should have some side effects... would the "Control rear channel filtering" setting in BeSweet be of help when I'm converting to .wav? (I'm not doing direct AC3 to MP3 conversions, all editing / limting / etc is done manually in the .wav stage.) Last edited by StickHorsie; 29th October 2008 at 13:17. |
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28th October 2008, 22:34 | #14 | Link | |
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Because AAC-HE is not fully supported in stand-alones.
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29th October 2008, 12:14 | #16 | Link | |
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Works with DS filter in PC players with full surround (quality limited by bitrate) and in standalone players works like DPL II, I think never will be fully supported.
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29th October 2008, 17:29 | #17 | Link |
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FFdshow is also able to decode Aud-X 6Ch (5.1) MP3 streams, provided you have Audxlib.dll located within the "FFdshow" folder.....
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Tags |
ac3, convert, dolby surround, dplii, mp3 |
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