Hello,
I'm using the ffmpeg library to decode / encode audio in Java, using the
Process objets. The aim is to decode the datas of an external source
with ffmpeg, and then to stream the decoded (wav) datas locally to catch
them in my Java code. After I processed them in Java, I'll send them
back to ffmpeg to generate a coded stream (mp3, opus, ogg...) or to
create a file.
As Java sounds only allow wav audio datas, I made a first try with this
command line :
ffmpeg -i http://199.180.75.118:80 -acodec pcm_s16le -ar 44100 -ac
2 "/home/dr_click/montest.wav"
It works. But, my goal is to get the frames on the fly and not a file. I
thought about using a pipe but it seems it will work only with Linux and
not with Windows (and no idea for MacOS)
To stream locally a wav file and to catch it with Java into a
AudioInputStream, I wrote this command :
ffmpeg -re -i http://199.180.75.118:80 -acodec pcm_s16le -ar 44100
-ac 2 -f rtp rtp://127.0.0.1:1234
It seems to work on the server side. But, when I enter the below command
line to act like the client side :
ffplay rtp://127.0.0.1:1234
It doesn't work at all. I got this error :
- [rtp @ 0x7f29c8000b80] Unable to receive RTP payload type 97 without
an SDP file describing it
So I tried the couple :
ffmpeg -i http://199.180.75.118:80 -acodec pcm_s16le -ar 44100 -ac
2 -f rtp -sdp_file /home/dr_click/audio.sdp rtp://127.0.1.1:1234
and
ffplay /home/dr_click/audio.sdp
I got the following error :
- [rtp @ 0x7f7d00008040] Protocol 'rtp' not on whitelist 'file,crypto'! if
And if I finally tried :
fmpeg -protocol_whitelist file,http,rtp,tcp -i
http://199.180.75.118:80 -acodec pcm_s16le -ar 44100 -ac 2 -f rtp
-sdp_file /home/dr_click/audio.sdp rtp://127.0.1.1:1234
But I get the same "whitelist" error.
Which point do I miss to stream locally some wav datas and then catching
them in the JAVA AudioInputStream ?
Thank you for all your replies.
Regards,
Nicolas
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