#Ac3 448 kbps dvd trouble how to#
#Ac3 448 kbps dvd trouble install#

Ubuntu% aften -acmod 3 -chconfig '3/0' -ch_fl fl.wav -ch_fc fc.wav -ch_fr fr.wav audio.ac3 Ubuntu% audio_split audio.wav6 fl.wav fr.wav fc.wav lfe.wav sl.wav sr.wav Now, we'll recombine the 3 channels we want to keep and encode them to AC3: Ubuntu% dcadec -o wav6 audio.dts > audio.wav6Then, let's split the multichannel WAV file into individual mono WAV files: Thus, we only need channel 1, 2 and 3 from that file. We'll try both :)ДЄnyway, the channel order for the sample file is front left, front right, front center, low frequency effect (LFE), surround left and surround right. Another one could be to keep the orginal bitrate and 'spend' the savings to increase the quality of the front channels. Why would you want to do that? Well, less channels allow a lower bitrate, so saving space is an obvious reason.

we'll just use the left front, center front and right front channels. In this example, we're going to encode the DTS file to AC3.0, i.e. Why don't you check for yourself with ' dcadec -h' and ' aften -longhelp' ? )Д¦) Example #3: (DTS -> AC3 3.0) with dcadec and aften Ubuntu% dcadec -o wav6 audio.dts - | aften -b 640 - audio.ac3 What's the point of doing this instead of using ffmpeg? Well, dcadec and especially aften have plenty of options which allow very fine control on the output file. Ubuntu% aften -b 640 audio.wav6 audio.ac3That's it! In fact, you can do it in one step by piping the dcadec output into aften: Now, let's encode this file as to 6-channel AC3 640 Kbit/s with aften: Here's the file displayed by Audacity: 6 channels indeed! Ubuntu% ffmpeg -i audio.dts audio.wav6 One way or the other, we've just created a 6-channel WAV file: Ubuntu% dcadec -o wav6 audio.dts > audio.wav6For the sake of completeness, you could also do this: Ubuntu% dcadec audio.dtsWhat we really want to do is to decode it to a WAV file: In in simplest form, dcadec plays DTS files: We'll use dcadec to decode the DTS file and aften to encode it to AC3. Let's revisit the previous example but with different tools. Anything more complex requires other tools.ДҐ) Example #2: (DTS -> AC3 5.1) with dcadec and aften ' Resampling with input channels greater than 2 unsupported.Д¬an not resample 6 channels 48000 Hz to 3 channels 48000 Hz'ДЄll in all, ffmpeg is a nice and easy solution if you want to preserve the same number of channels or if you want to downmix to stereo. Ubuntu% ffmpeg -i audio.dts -acodec ac3 -ac 6 -ab 448k audio.ac3 Any other number of channel leads to this error (e.g. We can also convert the DTS file to 2-channel AC3: However, if you intend to play the file on the Playstation 3, you can go up to 640Kbit/s. Ubuntu% ffmpeg -i audio.dts -acodec ac3 -ac 6 -ab 448k audio.ac3448 KBit/s is the maximum authorized AC3 bitrate for DVDs. We can easily convert it to AC 5.1 with ffmpeg: There is no installation procedure, so just copy audio_split and audio_combine to /usr/local/bin.Д¤) Example #1: (DTS -> AC3 5.1) & (DTS -> AC3 stereo) with ffmpegД¬hannel positions : Front: L C R, Surround: L R, LFEДЄs you can see, this is DTS 5.1 at 1,536Kbit/s.

#Ac3 448 kbps dvd trouble install#

Ubuntu% sudo apt-get install libsndfile1-dev These tools require the libsndfile library: DCMAKE_INSTALL_PREFIX:STRING='/usr/local'ДЈ) Installing audio_split and audio_combine At the time of this writing, the latest version is 0.0.5. Now, let's get the source, build it and install it. In order to build aften, we need to install cmake: This obviously installs the library itself, but also the dcadec tool which we'll use later on. Let's get the source, build it and install it:

#Ac3 448 kbps dvd trouble how to#

I also showed you how to build it in a previous article.ДЄt the time of this writing, the latest version is 0.0.5. mediainfo : the best tool to learn everything there is know on the true nature of your media files.audiosplit and audiocombine, two nice and simple tools which split and combine (duh) multichannel WAV files.aften, an advanced AC3 encoder which improves on the one included in ffmpeg,.libdca and its tools, a library specialized in decoding the DTS Coherent Acoustics (DCA) codec,.

I showed you how to build it in a previous article. ffmpeg, the best general-purpose tool for audio transcoding.The purpose of this article is to show you to handle multichannel audio streams, which may be found in DVDs and in multimedia files. DVDs have made multichannel audio popular, most notably DTS and Dolby Labs' AC3, and it looks like no one will settle down for good old stereo anymore :)