github/mpv
1
Fork 0
mirror of https://github.com/mpv-player/mpv synced 2024-11-07 01:47:00 +01:00
Code Releases Activity

AC3 --> AC-3

Browse Source 
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@24056 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
diego 2007-08-13 22:50:44 +00:00
parent 183f336611
commit fc0d1814d4
6 changed files with 50 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
DOCS/man/en/mplayer.1
View File

@ -1052,17 +1052,17 @@ Since MPlayer can only seek to the next keyframe this may be inexact.
.
.TP
.B \-a52drc <level>
Select the Dynamic Range Compression level for AC3 audio streams.
Select the Dynamic Range Compression level for AC-3 audio streams.
<level> is a float value ranging from 0 to 1, where 0 means no compression
and 1 (which is the default) means full compression (make loud passages more
silent and vice versa).
This option only shows an effect if the AC3 stream contains the required range
This option only shows an effect if the AC-3 stream contains the required range
compression information.
.
.TP
.B \-aid <ID> (also see \-alang)
Select audio channel (MPEG: 0\-31, AVI/\:OGM: 1\-99, ASF/\:RM: 0\-127,
VOB(AC3): 128\-159, VOB(LPCM): 160\-191, MPEG-TS 17\-8190).
VOB(AC-3): 128\-159, VOB(LPCM): 160\-191, MPEG-TS 17\-8190).
MPlayer prints the available audio IDs when run in verbose (\-v) mode.
When playing an MPEG-TS stream, MPlayer/\:MEncoder will use the first program
(if present) with the chosen audio stream.
@ -1183,14 +1183,14 @@ Request the number of playback channels (default: 2).
MPlayer asks the decoder to decode the audio into as many channels as
specified.
Then it is up to the decoder to fulfill the requirement.
This is usually only important when playing videos with AC3 audio (like DVDs).
This is usually only important when playing videos with AC-3 audio (like DVDs).
In that case liba52 does the decoding by default and correctly downmixes the
audio into the requested number of channels.
To directly control the number of output channels independently of how many
channels are decoded, use the channels filter.
.br
.I NOTE:
This option is honored by codecs (AC3 only), filters (surround) and audio
This option is honored by codecs (AC-3 only), filters (surround) and audio
output drivers (OSS at least).
.sp 1
Available options are:
@ -1254,7 +1254,7 @@ libmpdemux/\:demuxer.h.
.
.TP
.B \-dumpaudio (MPlayer only)
Dumps raw compressed audio stream to ./stream.dump (useful with MPEG/\:AC3,
Dumps raw compressed audio stream to ./stream.dump (useful with MPEG/\:AC-3,
in most other cases the resulting file will not be playable).
If you give more than one of \-dumpaudio, \-dumpvideo, \-dumpstream
on the command line only the last one will work.
@ -1601,7 +1601,7 @@ Number of audio channels to capture.
This option lets you play raw audio files.
You have to use \-demuxer rawaudio as well.
It may also be used to play audio CDs which are not 44kHz 16-bit stereo.
For playing raw AC3 streams use \-rawaudio format=0x2000 \-demuxer rawaudio.
For playing raw AC-3 streams use \-rawaudio format=0x2000 \-demuxer rawaudio.
.sp 1
Available options are:
.sp 1
@ -4027,7 +4027,7 @@ Force the l3codeca.acm MP3 codec.
.IPs "\-ac mad,"
Try libmad first, then fall back on others.
.IPs "\-ac hwac3,a52,"
Try hardware AC3 passthrough, software AC3, then others.
Try hardware AC-3 passthrough, software AC-3, then others.
.IPs "\-ac hwdts,"
Try hardware DTS passthrough, then fall back on others.
.IPs "\-ac -ffmp3,"

24
DOCS/xml/en/codecs.xml
View File

@ -359,11 +359,11 @@ satisfied the requirements for <systemitem class="library">x264</systemitem>.
Windows Media Audio 9 (WMAv3) (using DMO DLL)
</para></listitem>
<listitem><para>
AC3 Dolby audio (<emphasis role="bold">native</emphasis> code, with
AC-3 Dolby audio (<emphasis role="bold">native</emphasis> code, with
MMX/SSE/3DNow! optimization)
</para></listitem>
<listitem><para>
AC3 passing through sound card hardware
AC-3 passing through sound card hardware
</para></listitem>
<listitem><para>
AAC
@ -372,7 +372,7 @@ satisfied the requirements for <systemitem class="library">x264</systemitem>.
Ogg Vorbis audio codec (<emphasis role="bold">native</emphasis> library)
</para></listitem>
<listitem><para>
RealAudio: DNET (low bitrate AC3), Cook, Sipro and ATRAC3
RealAudio: DNET (low bitrate AC-3), Cook, Sipro and ATRAC3
</para></listitem>
<listitem><para>
QuickTime: Qualcomm and QDesign audio codecs
@ -395,17 +395,17 @@ satisfied the requirements for <systemitem class="library">x264</systemitem>.
<!-- ********** -->
<sect2 id="swac3">
<title>Software AC3 decoding</title>
<title>Software AC-3 decoding</title>
<para>
This is the default decoder used for files with AC3 audio.
This is the default decoder used for files with AC-3 audio.
</para>
<para>
The AC3 decoder can create audio output mixes for 2, 4, or 6 speakers.
The AC-3 decoder can create audio output mixes for 2, 4, or 6 speakers.
When configured for 6 speakers, this decoder provides separate output of
all the AC3 channels to the sound driver, allowing for full "surround
sound" experience without the external AC3 decoder required to use the
all the AC-3 channels to the sound driver, allowing for full "surround
sound" experience without the external AC-3 decoder required to use the
hwac3 codec.
</para>
@ -415,7 +415,7 @@ channels. Use <option>-channels 2</option> for a stereo downmix. For a 4
channel downmix (Left Front, Right Front, Left Surround and Right Surround
outputs), use <option>-channels 4</option>. In this case, any center
channel will be mixed equally to the front channels.
<option>-channels 6</option> will output all the AC3 channels as they are
<option>-channels 6</option> will output all the AC-3 channels as they are
encoded - in the order Left, Right, Left Surround, Right Surround, Center and
LFE.
</para>
@ -436,12 +436,12 @@ also supposed to work).
<!-- ********** -->
<sect2 id="hwac3">
<title>Hardware AC3 decoding</title>
<title>Hardware AC-3 decoding</title>
<para>
You need an AC3 capable sound card, with digital out (S/PDIF). The card's
You need an AC-3 capable sound card, with digital out (S/PDIF). The card's
driver must properly support the AFMT_AC3 format (C-Media does). Connect
your AC3 decoder to the S/PDIF output, and use the <option>-ac
your AC-3 decoder to the S/PDIF output, and use the <option>-ac
hwac3</option> option. It is experimental but known to work with C-Media
cards and Soundblaster Live! + ALSA (but not OSS) drivers and DXR3/Hollywood+
MPEG decoder cards.

2
DOCS/xml/en/containers.xml
View File

@ -61,7 +61,7 @@ MPEG files come in different guises:
<listitem><para>
VOB: This is the MPEG file format on <emphasis role="bold">DVDs</emphasis>.
It is the same as MPG, plus the capability to contain subtitles or non-MPEG
(AC3) audio. It contains encoded MPEG-2 video and usually AC3 audio, but DTS,
(AC-3) audio. It contains encoded MPEG-2 video and usually AC-3 audio, but DTS,
MP2 and uncompressed LPCM are allowed, too. <emphasis role="bold">Read the
<link linkend="dvd">DVD</link> section</emphasis>!
</para></listitem>

36
DOCS/xml/en/encoding-guide.xml
View File

@ -1517,14 +1517,14 @@ to get a list of supported codecs.
<para>
Audio is a much simpler problem to solve: if you care about quality, just
leave it as is.
Even AC3 5.1 streams are at most 448Kbit/s, and they are worth every bit.
Even AC-3 5.1 streams are at most 448Kbit/s, and they are worth every bit.
You might be tempted to transcode the audio to high quality Vorbis, but
just because you do not have an A/V receiver for AC3 pass-through today
just because you do not have an A/V receiver for AC-3 pass-through today
does not mean you will not have one tomorrow. Future-proof your DVD rips by
preserving the AC3 stream.
You can keep the AC3 stream either by copying it directly into the video
preserving the AC-3 stream.
You can keep the AC-3 stream either by copying it directly into the video
stream <link linkend="menc-feat-mpeg4">during the encoding</link>.
You can also extract the AC3 stream in order to mux it into containers such
You can also extract the AC-3 stream in order to mux it into containers such
as NUT or Matroska.
<screen>
mplayer <replaceable>source_file.vob</replaceable> -aid 129 -dumpaudio -dumpfile <replaceable>sound.ac3</replaceable>
@ -1569,7 +1569,7 @@ are discontinuities/splices where there are missing or extra audio frames.
The correct way to handle this kind of problem is to insert silence or
cut audio at these points.
However <application>MPlayer</application> cannot do that, so if you
demux the AC3 audio and encode it with a separate app (or dump it to PCM with
demux the AC-3 audio and encode it with a separate app (or dump it to PCM with
<application>MPlayer</application>), the splices will be left incorrect
and the only way to correct them is to drop/dup video frames at the
splice.
@ -1731,7 +1731,7 @@ limitations:
Unfortunately, the most efficient codec, Vorbis, does not meet
either of these requirements.
Therefore, if you plan to store your movie in AVI, you will have to
use a less efficient codec such as MP3 or AC3.
use a less efficient codec such as MP3 or AC-3.
</para></listitem>
</orderedlist>
@ -2600,7 +2600,7 @@ mencoder dvd://2 -o <replaceable>title2.avi</replaceable> -ovc lavc -lavcopts vc
</row>
<row>
<entry>ac3</entry>
<entry>AC3, AKA Dolby Digital</entry>
<entry>AC-3, AKA Dolby Digital</entry>
</row>
<row>
<entry>adpcm_ima_wav</entry>
@ -2635,7 +2635,7 @@ The first column contains the codec names that should be passed after the
</para>
<informalexample><para>
An example with AC3 compression:
An example with AC-3 compression:
<screen>
mencoder dvd://2 -o <replaceable>title2.avi</replaceable> -oac lavc -lavcopts acodec=ac3 -ovc copy
</screen>
@ -4746,7 +4746,7 @@ compliant.
<entry>MPEG-2</entry>
<entry>9800 kbps</entry>
<entry>48000 Hz</entry>
<entry>AC3,PCM</entry>
<entry>AC-3,PCM</entry>
<entry>1536 kbps (max)</entry>
<entry>30000/1001, 24000/1001</entry>
<entry>4:3, 16:9 (only for 720x480)</entry>
@ -4759,7 +4759,7 @@ compliant.
<entry>MPEG-1</entry>
<entry>1856 kbps</entry>
<entry>48000 Hz</entry>
<entry>AC3,PCM</entry>
<entry>AC-3,PCM</entry>
<entry>1536 kbps (max)</entry>
<entry>30000/1001, 24000/1001</entry>
<entry>4:3, 16:9</entry>
@ -4792,7 +4792,7 @@ compliant.
<entry>MPEG-2</entry>
<entry>9800 kbps</entry>
<entry>48000 Hz</entry>
<entry>MP2,AC3,PCM</entry>
<entry>MP2,AC-3,PCM</entry>
<entry>1536 kbps (max)</entry>
<entry>25</entry>
<entry>4:3, 16:9 (only for 720x576)</entry>
@ -4803,7 +4803,7 @@ compliant.
<entry>MPEG-1</entry>
<entry>1856 kbps</entry>
<entry>48000 Hz</entry>
<entry>MP2,AC3,PCM</entry>
<entry>MP2,AC-3,PCM</entry>
<entry>1536 kbps (max)</entry>
<entry>25</entry>
<entry>4:3, 16:9</entry>
@ -5169,7 +5169,7 @@ support it too well.
<para>
For DVD audio, <systemitem class="library">libavcodec</systemitem>'s
AC3 codec is used.
AC-3 codec is used.
</para>
@ -5255,10 +5255,10 @@ keyint=18:vstrict=0:acodec=ac3:abitrate=192:aspect=16/9 -ofps 30000/1001 \
<sect3 id="menc-feat-vcd-dvd-all-pal-ac3-copy">
<title>PAL AVI Containing AC3 Audio to DVD</title>
<title>PAL AVI Containing AC-3 Audio to DVD</title>
<para>
If the source already has AC3 audio, use -oac copy instead of re-encoding it.
If the source already has AC-3 audio, use -oac copy instead of re-encoding it.
<screen>
mencoder -oac copy -ovc lavc -of mpeg -mpegopts format=dvd:tsaf \
-vf scale=720:576,harddup -ofps 25 \
@ -5270,10 +5270,10 @@ keyint=15:vstrict=0:aspect=16/9 -o <replaceable>movie.mpg</replaceable> <replace
<sect3 id="menc-feat-vcd-dvd-all-ntsc-ac3-copy">
<title>NTSC AVI Containing AC3 Audio to DVD</title>
<title>NTSC AVI Containing AC-3 Audio to DVD</title>
<para>
If the source already has AC3 audio, and is NTSC @ 24000/1001 fps:
If the source already has AC-3 audio, and is NTSC @ 24000/1001 fps:
<screen>
mencoder -oac copy -ovc lavc -of mpeg -mpegopts format=dvd:tsaf:telecine \
-vf scale=720:480,harddup -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:\

20
DOCS/xml/en/usage.xml
View File

@ -541,10 +541,10 @@ explanation.
<sect3 id="advaudio-surround-passthrough">
<title>AC3/DTS Passthrough</title>
<title>AC-3/DTS Passthrough</title>
<para>
DVDs usually have surround audio encoded in AC3 (Dolby Digital) or DTS
DVDs usually have surround audio encoded in AC-3 (Dolby Digital) or DTS
(Digital Theater System) format. Some modern audio equipment is capable of
decoding these formats internally. <application>MPlayer</application> can be
configured to relay the audio data without decoding it. This will only work if
@ -552,7 +552,7 @@ you have a S/PDIF (Sony/Philips Digital Interface) jack in your sound card.
</para>
<para>
If your audio equipment can decode both AC3 and DTS, you can safely enable
If your audio equipment can decode both AC-3 and DTS, you can safely enable
passthrough for both formats. Otherwise, enable passthrough for only the format
your equipment supports.
</para>
@ -560,13 +560,13 @@ your equipment supports.
<itemizedlist>
<title>To enable passthrough on the command line:</title>
<listitem><para>
For AC3 only, use <option>-ac hwac3</option>
For AC-3 only, use <option>-ac hwac3</option>
</para></listitem>
<listitem><para>
For DTS only, use <option>-ac hwdts</option>
</para></listitem>
<listitem><para>
For both AC3 and DTS, use <option>-afm hwac3</option>
For both AC-3 and DTS, use <option>-afm hwac3</option>
</para></listitem>
</itemizedlist>
@ -574,13 +574,13 @@ your equipment supports.
<title>To enable passthrough in the <application>MPlayer</application>
configuration file: </title>
<listitem><para>
For AC3 only, use <option>ac=hwac3,</option>
For AC-3 only, use <option>ac=hwac3,</option>
</para></listitem>
<listitem><para>
For DTS only, use <option>ac=hwdts,</option>
</para></listitem>
<listitem><para>
For both AC3 and DTS, use <option>afm=hwac3</option>
For both AC-3 and DTS, use <option>afm=hwac3</option>
</para></listitem>
</itemizedlist>
@ -588,7 +588,7 @@ your equipment supports.
Note that there is a comma (",") at the end of
<option>ac=hwac3,</option> and <option>ac=hwdts,</option>. This will make
<application>MPlayer</application> fall back on the codecs it normally uses when
playing a file that does not have AC3 or DTS audio.
playing a file that does not have AC-3 or DTS audio.
<option>afm=hwac3</option> does not need a comma;
<application>MPlayer</application> will fall back anyway when an audio family
is specified.
@ -708,7 +708,7 @@ audio outputs are often muted and set to zero volume by default.
<para>
Unfortunately, there is no standard for how channels are ordered. The orders
listed below are those of AC3 and are fairly typical; try them and see if your
listed below are those of AC-3 and are fairly typical; try them and see if your
source matches. Channels are numbered starting with 0.
<orderedlist spacing="compact">
@ -996,7 +996,7 @@ downmixing. Here is a way to downmix PCM using <option>pan</option>:
since we only care about the output of the first two channels, we only need to
make two sets; the remaining four sets can be omitted. Beware that not all
multichannel audio files have the same channel order! This example
demonstrates downmixing a file with the same channels as AC3 5.1:
demonstrates downmixing a file with the same channels as AC-3 5.1:
<programlisting>
0 - front left
1 - front right

2
DOCS/xml/en/video.xml
View File

@ -2116,7 +2116,7 @@ problems, or DVD subtitle problems, give <option>:sync</option> a try.
<varlistentry>
<term><option>-ac hwac3</option></term>
<listitem><para>
The em8300 supports playing back AC3 audio (surround sound) through the
The em8300 supports playing back AC-3 audio (surround sound) through the
digital audio output of the card. See the <option>-ao oss</option> option
above, it must be used to specify the DXR3's output instead of a sound card.
</para></listitem>