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rowntreerob on 07/13/11

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youtube rtsp CLI request - AUDIO TRACK only

/ Published in: Bash

youtube cloud to store a video clip where client app wants only amr-nb audio.
tactic to make good use of bandwidth over 3G...

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$ ./openRTSP -a rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp | \
./mplayer -cache 8092 - -rawaudio channels=1:rate=8000:samplesize=2:format=0x73616D72

-- OR using 2 steps...

$ ./openRTSP -a rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp | cat > test_audio_only_rtsp

$ ../mplayer  -rawaudio channels=1:rate=8000:samplesize=2:format=0x73616D72 test_audio_only_rtsp

play download on android client:

new Intent(Intent.ACTION_VIEW).setDataAndType(Uri.parse("file:///mnt/sdcard/test_audio_only_rtsp.3gpp"), "audio/amr");

--DESCRIPTION

rtsp session & protocol by 'openrtsp' ( DESCRIBE, SETUP, PLAY ) on just the audio track belonging to the .3gp container.
pipe the raw stream to 'mplayer' which demuxes the combined RTP/encoded AUDIO .
mplayer plays the audio after interval in which the entire clip streams thru cache.

implication - i could not figure out a shared buffer arraingement where its ready to play as soon as small buffer loads?? rather, the entire clip needs to load to cache BEFORE the player takes over.

--prereq
http://code.google.com/apis/youtube/2.0/developers_guide_protocol_understanding_video_feeds.html  <-- for the rtsp links

http://gdata.youtube.com/feeds/api/videos?orderby=updated&vq=$ID
OR
http://gdata.youtube.com/feeds/api/users/${user}/uploads?orderby=updated&vq=$ID  <--- sample request

RESPONSE:  excerpt covering rtsp links:

<media:content url='rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp' 
type='video/3gpp' medium='video' expression='full' duration='64' yt:format='1'/>
<media:content url='rtsp://v4.cache4.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYESARFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp' 
type='video/3gpp' medium='video' expression='full' duration='64' yt:format='6'/><media:description

--NOTE:
from feed response, parse for 'yt:format='1'' for low bandwidth and for mobile suitability
So, in this instance, choose the v8.cache8 link as a connection to request using a Cli BASED rtsp client...

--Cygwin example using ( mplayer, openRTSP )... for amr-nb audio at 8000 rate

SDP INFO (audio only):
m=audio 0 RTP/AVP 99
b=AS:12   /*bandwidth mas =12kbs*/
a=rtpmap:99 AMR/8000/1
a=control:trackID=1
a=fmtp:99 octet-align

codec details from header file used by 'mplayer':

{{ 0x726D6173, 87, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -0 }, /* fourccmap */
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, /* outfmt */
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* outflags */
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, /* infmt */
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* inflags */
"ffamrnb", /* name */
"AMR Narrowband", /* info */
NULL, /* comment */
"amrnb", /* dll */
"ffmpeg", /* drv */

--- stdout FOR 2 STEP METHOD

$ ./openRTSP -a rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp | \
 cat > test_audio_only_rtsp

Opening connection to 74.125.212.247, port 554...
...remote connection opened
Sending request: OPTIONS rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp RTSP/1.0
CSeq: 2
User-Agent: ./testProgs/openRTSP (LIVE555 Streaming Media v2011.07.08)

Received 140 new bytes of response data.
Received a complete OPTIONS response:
RTSP/1.0 200 OK
Public: DESCRIBE, GET_PARAMETER, OPTIONS, PAUSE, PLAY, SETUP, SET_PARAMETER, TEARDOWN
CSeq: 2
Server: Google RTSP 1.0

Sending request: DESCRIBE rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp RTSP/1.0
CSeq: 3
User-Agent: ./testProgs/openRTSP (LIVE555 Streaming Media v2011.07.08)
Accept: application/sdp

Received 786 new bytes of response data.
Received a complete DESCRIBE response:
RTSP/1.0 200 OK
Content-Type: application/sdp
Cache-Control: must-revalidate
Date: Wed, 13 Jul 2011 21:01:21 GMT
Expires: Wed, 13 Jul 2011 21:01:21 GMT
Last-Modified: Wed, 13 Jul 2011 21:01:21 GMT
Content-Base: rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp/
CSeq: 3
Server: Google RTSP 1.0
Content-Length: 406

v=0
o=GoogleStreamer 1946436214 1631140309 IN IP4 74.125.212.247
s=Video
c=IN IP4 0.0.0.0
b=AS:51
t=0 0
a=control:*
a=range:npt=0-63.800000
m=video 0 RTP/AVP 98
b=AS:39
a=rtpmap:98 H263-2000/90000
a=control:trackID=0
a=cliprect:0,0,144,176
a=framesize:98 176-144
a=fmtp:98 profile=0;level=10
m=audio 0 RTP/AVP 99
b=AS:12
a=rtpmap:99 AMR/8000/1
a=control:trackID=1
a=fmtp:99 octet-align

Opened URL "rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp", returning a SDP description:
v=0
o=GoogleStreamer 1946436214 1631140309 IN IP4 74.125.212.247
s=Video
c=IN IP4 0.0.0.0
b=AS:51
t=0 0
a=control:*
a=range:npt=0-63.800000
m=video 0 RTP/AVP 98
b=AS:39
a=rtpmap:98 H263-2000/90000
a=control:trackID=0
a=cliprect:0,0,144,176
a=framesize:98 176-144
a=fmtp:98 profile=0;level=10
m=audio 0 RTP/AVP 99
b=AS:12
a=rtpmap:99 AMR/8000/1
a=control:trackID=1
a=fmtp:99 octet-align

Ignoring "video/H263-2000" subsession, because we''ve asked to receive a single audio session only
Created receiver for "audio/AMR" subsession (client ports 64498-64499)
Sending request: SETUP rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp/trackID=1 RTSP/1.0
CSeq: 4
User-Agent: ./testProgs/openRTSP (LIVE555 Streaming Media v2011.07.08)
Transport: RTP/AVP;unicast;client_port=64498-64499

Received 360 new bytes of response data.
Received a complete SETUP response:
RTSP/1.0 200 OK
Session: 70cd7f38;timeout=90
Transport: RTP/AVP;unicast;mode=play;client_port=64498-64499;server_port=10580-10581;source=74.125.212.247;ssrc=50DF166F
Cache-Control: must-revalidate
Date: Wed, 13 Jul 2011 21:01:23 GMT
Expires: Wed, 13 Jul 2011 21:01:23 GMT
Last-Modified: Wed, 13 Jul 2011 21:01:23 GMT
CSeq: 4
Server: Google RTSP 1.0

Setup "audio/AMR" subsession (client ports 64498-64499)
Outputting data from the "audio/AMR" subsession to 'stdout'
Sending request: PLAY rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp/ RTSP/1.0
CSeq: 5
User-Agent: ./testProgs/openRTSP (LIVE555 Streaming Media v2011.07.08)
Session: 70cd7f38
Range: npt=0.000-63.800

Received 265 new bytes of response data.
Received a complete PLAY response:
RTSP/1.0 200 OK
Session: 70cd7f38;timeout=90
Range: npt=0.000-63.800
RTP-Info: url=rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp/trackID=1;seq=31872;rtptime=272756789
CSeq: 5
Server: Google RTSP 1.0

Started playing session
Receiving streamed data (for up to 68.800000 seconds)...
Sending request: TEARDOWN rtsp://v8.cache8.c.youtube.com/CigLENy73wIaHwlcw_gs85OUchMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp/ RTSP/1.0
CSeq: 6
User-Agent: ./testProgs/openRTSP (LIVE555 Streaming Media v2011.07.08)
Session: 70cd7f38

Received 72 new bytes of response data.
Received a complete TEARDOWN response:
RTSP/1.0 200 OK
CSeq: 6
Session: 70cd7f38
Server: Google RTSP 1.0

======= STEP 2

$ ./mplayer   -rawaudio channels=1:rate=8000:samplesize=2:format=0x73616D72 test_audio_only_rtsp

Playing test_audio_only_rtsp.
Invalid seek to negative position ffffffffffffffff!
libavformat file format detected.
[amr @ 0x1c507f0] max_analyze_duration 5000000 reached at 5000000
[amr @ 0x1c507f0] Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: audio (amrnb), -aid 0
Load subtitles in ./
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 8000 Hz, 1 ch, floatle, 12.8 kbit/5.00% (ratio: 1600->32000)
Selected audio codec: [ffamrnb] afm: ffmpeg (AMR Narrowband)
==========================================================================
AO: [win32] 8000Hz 1ch s16le (2 bytes per sample)
Video: no video
Starting playback...
A:  59.9 (59.8) of 63.6 (01:03.5)  0.0%

Exiting... (End of file)

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