mirror of
git://projects.qi-hardware.com/openwrt-packages.git
synced 2024-12-18 23:19:41 +02:00
47 lines
1.3 KiB
Plaintext
47 lines
1.3 KiB
Plaintext
1. prepare your video files for Ben:
|
|
|
|
Use ffmpeg2theora or ffmpeg with vp8, vorbis, mkv.
|
|
|
|
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.
|
|
|
|
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 output.ogv
|
|
|
|
In case sample rate doesn't match 48000 the default will be to perform quick
|
|
resampling, introducing noticeable quality degradation. Add -af
|
|
resample=44100:0:1 to improve audio quality at the cost of a few percent of
|
|
CPU usage.
|
|
|
|
(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
|
|
)
|