Kontron KTT20-pITX - Manual (Page 38)

KTD-S0045-D Page 34 Linux® BSP
KTT20/pITX Software Guide
9.2.2 Reencoding Examples
With the ffmpeg tool you can reencode video files which do not comply the criteria listed above.
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Create H.264 baseline profile, avg bitrate 15 Mbps, peak bitrate 20 Mbps:
ffmpeg -y -i ./video.mov -vcodec libx264 -profile baseline -b 15M-maxrate 20M -bufsize 1830k
-acodec copy ./video_h264_max20_aver15.mov
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Create Xvid, avg bitrate 8 Mbps, peak bitrate 10 Mbps:
ffmpeg -y -i ./video.mov -vcodec mpeg4 -vtag xvid -b 8M -maxrate 10M-bufsize 1830k
-acodec copy ./video_xvid_max10_aver8.avi
9.3 Audio Settings
If you have trouble with audio input/output please check the 'alsamixer' settings.
Examples with the command line tool 'amixer':
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For an overview type amixer contents
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To change a value type e.g.
amixer cset numid=46 on
You can find some audio files in the directory usr/share/sounds/... . Play these files with the 'aplay' tool,
for example aplay ring.wav .
The following table gives an indication to solve the problem(s).
Control Name Value
1 Left Input PGA Switch off
2 Left Input PGA Volume 15
3 Left Input PGA Common Mode Switch off
4 Right Input PGA Switch off
5 Right Input PGA Volume 15
6 Right Input PGA Common Mode Switch off
7 ADC OSR High performance
8 HPF Switch off
9 HPF Mode Hi-fi
10 DRC Switch off
11 DRC Compressor Slope R0 1/16
12 DRC Compressor Slope R1 1
13 DRC Compressor Threshold Volume 124
14 DRC Volume 15
15 DRC Minimum Gain Volume 0
16 DRC Maximum Gain Volume 0
17 DRC Attack Rate 1.45ms
18 DRC Decay Rate 743ms
19 DRC FF Delay 9 samples
20 DRC Anticlip Switch on
21 DRC QR Switch on
22 DRC QR Threshold Volume 2