Difference between revisions of "DAB/DAB+ encoding"
| Line 1: | Line 1: | ||
Encoding the sound to [[wikipedia:MPEG-1 Audio Layer II|MPEG-2 Layer II]] for DAB, [[wikipedia:High-Efficiency Advanced Audio Coding|MPEG-4 HE-AACv2]] for DAB+ or video in MPEG-4 H.264 for T-DMB beforefeeding it to the multiplexer. | Encoding the sound to [[wikipedia:MPEG-1 Audio Layer II|MPEG-2 Layer II]] for DAB, [[wikipedia:High-Efficiency Advanced Audio Coding|MPEG-4 HE-AACv2]] for DAB+ or video in MPEG-4 H.264 for T-DMB beforefeeding it to the multiplexer. | ||
| − | ==DAB audio encoding with toolame== | + | ===DAB audio encoding with toolame=== |
*'''[[toolame]]''' MPEG-Layer II encoder (DAB) | *'''[[toolame]]''' MPEG-Layer II encoder (DAB) | ||
| − | ===mpg123 input=== | + | ====mpg123 input==== |
toolame can take a file or a raw PCM stream as input. | toolame can take a file or a raw PCM stream as input. | ||
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mpg123 -b 1024 -r 48000 -s http://maxxima.mine.nu:8000 | mpg123 -b 1024 -r 48000 -s http://maxxima.mine.nu:8000 | ||
| − | ===jack input=== | + | ====jack input==== |
Toolame doesn't support jack, we use arecord with ALSA emulation to get . It is a dirty workaround, it is foreseen to find a better way in the future for example by modifying toolame to support jack: | Toolame doesn't support jack, we use arecord with ALSA emulation to get . It is a dirty workaround, it is foreseen to find a better way in the future for example by modifying toolame to support jack: | ||
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arecord -t raw -f S16_LE -c 2 -r 48000 -D jackplug |toolame -s 48 -D 4 -b 128 /dev/stdin ./1.ff | arecord -t raw -f S16_LE -c 2 -r 48000 -D jackplug |toolame -s 48 -D 4 -b 128 /dev/stdin ./1.ff | ||
| − | ==DAB+ audio encoding with crc-dabplus== | + | ===DAB+ audio encoding with crc-dabplus=== |
*'''[[CRC-dabplus]]''' HE-AAC encoder (DAB+) from CRC (warning, it is not free/open source because of royalty) | *'''[[CRC-dabplus]]''' HE-AAC encoder (DAB+) from CRC (warning, it is not free/open source because of royalty) | ||
| − | ===jack input=== | + | ====jack input==== |
Example of jackplug input (ALSA emulation), encoding at 48kbps, output to a FIFO file: | Example of jackplug input (ALSA emulation), encoding at 48kbps, output to a FIFO file: | ||
crc-dabplus -i card://jackplug -c 2 -b 48 -o file://2.ff | crc-dabplus -i card://jackplug -c 2 -b 48 -o file://2.ff | ||
| − | ==Tools for data services encoding== | + | ===Tools for data services encoding=== |
*[[CRC-SlideShow]] : slideshow generator from CRC. | *[[CRC-SlideShow]] : slideshow generator from CRC. | ||
*[http://code.google.com/p/dab-epg/ DAB-EPG API] from Global Radio Labs | *[http://code.google.com/p/dab-epg/ DAB-EPG API] from Global Radio Labs | ||
Revision as of 01:38, 29 December 2010
Encoding the sound to MPEG-2 Layer II for DAB, MPEG-4 HE-AACv2 for DAB+ or video in MPEG-4 H.264 for T-DMB beforefeeding it to the multiplexer.
DAB audio encoding with toolame
- toolame MPEG-Layer II encoder (DAB)
mpg123 input
toolame can take a file or a raw PCM stream as input.
"mpg123" can be used to take Internet radio stream and convert them from mp3 to raw PCM samples. Be careful, it has been noticed that earlier version have a memory leak when resampling. We use version 1.4.3 to avoid the problem.
Example that decode an mp3 stream, resample it to 48kHz and output the raw samples to stdout:
mpg123 -b 1024 -r 48000 -s http://maxxima.mine.nu:8000
jack input
Toolame doesn't support jack, we use arecord with ALSA emulation to get . It is a dirty workaround, it is foreseen to find a better way in the future for example by modifying toolame to support jack:
Example:
arecord -t raw -f S16_LE -c 2 -r 48000 -D jackplug |toolame -s 48 -D 4 -b 128 /dev/stdin ./1.ff
DAB+ audio encoding with crc-dabplus
- CRC-dabplus HE-AAC encoder (DAB+) from CRC (warning, it is not free/open source because of royalty)
jack input
Example of jackplug input (ALSA emulation), encoding at 48kbps, output to a FIFO file:
crc-dabplus -i card://jackplug -c 2 -b 48 -o file://2.ff
Tools for data services encoding
- CRC-SlideShow : slideshow generator from CRC.
- DAB-EPG API from Global Radio Labs
