Difference between revisions of "FDK-AAC-DABplus"
(Created page with "== Installation == This is open-source version of DAB+ encoder. To build DAB+ encoder, you need fec library from crc.ca website: http://mmbtools.crc.ca/content/view/39/65/, foll…") |
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This is open-source version of DAB+ encoder. | This is open-source version of DAB+ encoder. | ||
| − | To build DAB+ encoder, you need fec library from crc.ca website: http://mmbtools.crc.ca/content/view/39/65/, | + | To build DAB+ encoder, you need fec library from crc.ca website: http://mmbtools.crc.ca/content/view/39/65/, follow instrutcions to install it to the system. If you already build crc-dabmux from sources, then this library is already installed. Next, download and build encoder: |
git clone https://github.com/piratfm/fdk-aac-dabplus.git | git clone https://github.com/piratfm/fdk-aac-dabplus.git | ||
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<6> ETI frame number: 228 | <6> ETI frame number: 228 | ||
| − | Then the stream have to be buffered before giving it to muxer | + | Then the stream have to be buffered before giving it to muxer, this additional buffer installed between encoder and fifo. To calculate proper block size for mbuffer ("-s" parameter), the table below may be used: |
{| border="1" cellpadding="5" cellspacing="0" | {| border="1" cellpadding="5" cellspacing="0" | ||
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| − | In example above, for stream with bitrate 24 kbps, mbuffer size setted to 360 bytes. This trick | + | In example above, for stream with bitrate 24 kbps, mbuffer size setted to 360 bytes. This trick helping to solve problem. |
Revision as of 18:50, 11 September 2013
Installation
This is open-source version of DAB+ encoder.
To build DAB+ encoder, you need fec library from crc.ca website: http://mmbtools.crc.ca/content/view/39/65/, follow instrutcions to install it to the system. If you already build crc-dabmux from sources, then this library is already installed. Next, download and build encoder:
git clone https://github.com/piratfm/fdk-aac-dabplus.git cd fdk-aac-dabplus ./bootstrap ./configure --enable-example make sudo make install
Encoding samples
After successful installation, DAB+ encoding may be used:
Live Stream enconding and preparing for DAB mux:
arecord -t raw -f S16_LE -c 2 -r 48000 -D plughw:CARD=Loopback,DEV=0,SUBDEV=0 | \ aac-enc-dabplus -b 24 -f raw -c 2 -r 48000 -i /dev/stdin -o /dev/stdout 2>/dev/null | \ mbuffer -q -m 10k -P 100 -s 360 > station1.fifo
Wave file enconding and preparing for crc-dabmux:
aac-enc-dabplus -a -b 64 -i wave_file.wav -o station1.dabp
Problems solving
If crc-dabmux generates lot of errors like this:
<2> ERROR: Incomplete DAB+ frame! 136 != 360 <5> reach end of file -> rewinding <2> ERROR: Can't rewind file <6> ETI frame number: 228
Then the stream have to be buffered before giving it to muxer, this additional buffer installed between encoder and fifo. To calculate proper block size for mbuffer ("-s" parameter), the table below may be used:
| DAB+ Stream bitrate, kbps | Block size, bytes |
|---|---|
| 16 | 240 |
| 24 | 360 |
| 32 | 480 |
| 48 | 720 |
| 56 | 840 |
| 64 | 960 |
| 72 | 1080 |
| 128 | 1920 |
| 160 | 2400 |
In example above, for stream with bitrate 24 kbps, mbuffer size setted to 360 bytes. This trick helping to solve problem.
