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mplayer: Make alsa work (use larger buffer), and use it instead of OSS This

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reduces CPU load during playback, and also makes the audio mixer react much
more quickly (note: if mplayer automatic resampling kicks in now, we should
add -af-adv force=2 to make it use the fastest resampling filter)
This commit is contained in:
David Kühling 2011-04-27 08:28:37 +02:00
parent b4bc2ad5f0
commit 030251fdf6
3 changed files with 53 additions and 6 deletions
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4
mplayer/Makefile
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@ -10,7 +10,7 @@ PKG_NAME:=MPlayer
PKG_REV:=33333
FFMPEG_REV:=d84f191d37b8123203dff250531a4b4c0d5f587a
PKG_VERSION:=r$(PKG_REV)
PKG_RELEASE:=2
PKG_RELEASE:=3
PKG_SOURCE=$(PKG_NAME)-$(PKG_VERSION).tar.gz
FFMPEG_SOURCE_URL:=git://git.videolan.org/ffmpeg.git
@ -79,6 +79,8 @@ CONFIGURE_ARGS := --target=mips \
--disable-vdpau \
--disable-gl \
--disable-xf86keysym \
--disable-ossaudio \
--enable-alsa \
--enable-vidix \
--disable-vidix-pcidb \
--with-vidix-drivers="no" \

40
mplayer/README
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@ -1,11 +1,41 @@
this is outdated; mpeg1 support currently disabled (patents?).
1. prepare your video files for Ben:
Use ffmpeg2theora or ffmpeg with vp8, vorbis, mkv
Use ffmpeg2theora or ffmpeg with vp8, vorbis, mkv.
1. prepare your avi files for Ben:
When using theora, try to use a video width and height that are a multiple of
16. Currently theora decoding displays strange borders, if size is not a
multiple of 16.
for i in $(echo "*.avi"); do /usr/bin/mencoder -o "$i.mpg" -vf scale=320:-2 -of mpeg -ovc lavc -lavcopts vcodec=mpeg1video:vpass=1:vbitrate=200 -ofps 24000/1001 -oac lavc -lavcopts acodec=mp2:abitrate=64 "$i" && /usr/bin/mencoder -o "$i.mpg" -vf scale=320:-2 -of mpeg -ovc lavc -lavcopts vcodec=mpeg1video:vpass=2:vbitrate=200 -ofps 24000/1001 -oac lavc -lavcopts acodec=mp2:abitrate=64 "$i"; done
Try to use an audio sampling rate of 44100 for the vorbis audio. If the
automatic resampling of the alsa OSS emulation is triggered, quality degrades
a lot. Alternatively use 'mplayer -af resample=44100:1:1' on playback.
For encoding try to use libtheora 1.2 ("ptalarbvorm") which improves visual
qality a lot compared to previous versions. Always encode with
constant-quality *not* giving a bitrate target.
Here's an example encoding command:
ffmpeg2theora -o output.ogv input.avi \
-v8 -x320 -y176 \
-a0 --channels 2 --samplerate 44100
Yielding a pretty high visual quality (-v8 i.e. "80%"). Use -v6 for
approximately half the bitrate with moderate quality.
2. play your files with Ben:
mplayer -vo sdl -ac mad file.mpg
mplayer output.ogv
(Assumptions:
the following options should be set in your ~/.mplayer/config:
volume=10
vo=cvidix
screenw=320
screenh=240
fs=1
ac=tremor
quiet=1
)

15
mplayer/patches/020-alsa-buffer.patch Normal file
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@ -0,0 +1,15 @@
Index: MPlayer-r33304/libao2/ao_alsa.c
===================================================================
--- MPlayer-r33304.orig/libao2/ao_alsa.c 2011-04-27 08:12:35.000000000 +0200
+++ MPlayer-r33304/libao2/ao_alsa.c 2011-04-27 08:12:55.000000000 +0200
@@ -313,8 +313,8 @@
*/
static int init(int rate_hz, int channels, int format, int flags)
{
- unsigned int alsa_buffer_time = 500000; /* 0.5 s */
- unsigned int alsa_fragcount = 16;
+ unsigned int alsa_buffer_time = 1000000; /* 0.5 s */
+ unsigned int alsa_fragcount = 4;
int err;
int block;
strarg_t device;