nilaoda / av3a_decoder

AVS3-P3 / Audio Vivid Decoder

av3a_decoder

AVS3-P3 / Audio Vivid Decoder

!!ONLY 5.1.4 LAYOUT TESTED!!

!!VERY SLOW, BUT WORKS!!

Steps

1. Extract av3a audio from MPEG2-TS file (Optional)

You can use es_extractor.py to do that:

python es_extractor.py sample.ts sample.av3a 0x101

Note: You can use mediainfo to find av3a track pid, maybe 0x101 or 0x1100

2. Decode av3a to PCM

python av3a_decoder.py sample.av3a sample.wav

3. Post Process

You can set channel layout

5.1.4 Example:

ffmpeg -i sample.wav -filter "channelmap=0|1|2|3|4|5|6|7|8|9:FL+FR+FC+LFE+SL+SR+TFL+TFR+TBL+TBR" sample_layout.wav

You can encode wav to 448 kbps 5.1(side) AC3

ffmpeg -i sample.wav -filter "channelmap=0|1|2|3|4|5:FL+FR+FC+LFE+SL+SR" -b:a 448k sample_layout.ac3

Links

• https://github.com/wuxianlin/ijkplayer-av3a
• https://github.com/maiyao1988/ExAndroidNativeEmu
• https://www.nrta.gov.cn/art/2023/3/9/art_3715_63623.html
• https://www.nrta.gov.cn/art/2020/4/24/art_3715_50841.html