I'll try to be clear about the channel order issue: when I play a ripped dvd with this plain vanilla six-channel mplayer command I've managed to figure out the ffmpeg ac3 channel order, and so I can play it right. Well, I'm slowly beginning to see the light. Last edited by brancaleone on Sat 5:27 pm edited 1 time in total I thought I was a master using the channels and pan filters, but I still can't get it right.Īny ideas? I'd never had any problems with the ac3 files I encoded with Besweet in windowz, other than the poor quality.Īlgunos son humildes porque no les han dado la oportunidad. The same applies to the finished avi or ogm movie. Mplayer -ao alsa -channels 6 -rawaudio on:format=0x2000 outputfile.ac3Ĭhances are that the front channels will sound in the rear speakers, the center channels sounds in the front right speaker, and one rear channel sounds in the center speaker. I am utterly unable to play them properly on my 5.1 soundcard. Well, both methods work and the mencoder one is more flexible, but the output ac3 files are intrinsically different from the input files. Mplayer -dumpaudio -dumpfile outputfile.ac3 frameno.avi In another thread we've discussed methods to encode dvd audio to a 5.1 ac3 file.įfmpeg -i inputfile.ac3 -ab 128 outputfile.ac3Ĭat /ripped_dvd/*.vob | mencoder -channels 6 -ovc frameno -oac lavc -lavcopts acodec=ac3:abitrate=224 -aid 128 -o frameno.avi. Posted: Thu 6:44 pm Post subject: 5.1 Ac3 encoding with ffmpeg or mencoder That said, having listened to “Pray” on headphones and hearing most of it’s ELF junk, I’d prefer a 35Hz BW24HP on the mix to get rid of it.Gentoo Forums :: View topic - 5.1 Ac3 encoding with ffmpeg or mencoder ĥ.1 Ac3 encoding with ffmpeg or mencoder
Boost the lower range with EQ enough and drive your speakers with enough level to exceed Xmax, and you’ll hear the harmonics of them ^). Whether your system can reproduce those frequencies adequately to hear or feel them, they are there in the recording. Though the average level generally drops off steeply below 35 Hz, there are some glissandos tones with content even below 2Hz, an example below shows one of those with level at 2.7Hz equal in amplitude to the spectrum at 900Hz. Whatever you want to call them, the loudest sustained notes in “Pray” are in the octave from 35-70 Hz. When the music is stopped, the spectrograph goes black, indicating what is on screen is “music”, not noise. The music progresses vertically, most recent being at the bottom of the graph, amplitude displayed in color red being loudest, fading to yellow, green, then blue 25dB below the red level. I’ve posted screen prints of spectrographs (and an RTA with a 3-second "peak hold") of some portions of the song below. There are many different, repeated bass notes and glissando samples with fundamentals well below 35Hz in the song. The line between the two was blurred decades before “Pray” was created, when various attack/decay envelopes and low frequency oscillators began being used to modify various combinations of waveforms to sound like acoustic instruments, or something quite different.
Whether the synthetic droning samples are called “kicks” or “baseline” is really just semantics.
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