Streaming from multicast on tvOS fails (Apple TV)

[Dave]

Summary of the bug:

Following command FAILS on tvOS (but exactly same code works on iOS):

avformat_open_input(&pFormatCtx, sdpString, NULL, &opts)

where sdpString is

"data:text/plain;charset=utf-8,v=0\r\no=- 0 0 IN IP4 235.255.255.245\r\nc=IN IP4 235.255.255.245\r\nm=video 8008 RTP/AVP 26\r\na=source-filter: incl IN IP4 235.255.255.245 192.168.68.94\r\no=- 0 0 IN IP4 235.255.255.245\r\nc=IN IP4 235.255.255.245\r\nm=audio 8006 RTP/AVP 0\r\na=source-filter: incl IN IP4 235.255.255.245 192.168.68.94"

From log

[data @ 0x128351300] No default whitelist set
[data @ 0x128351300] Content-type: text/plain
[data @ 0x128351300] Ignoring option 'charset=utf-8'
[sdp @ 0x102089800] Format sdp probed with size=2048 and score=50
[rtp @ 0x128351df0] No default whitelist set
[udp @ 0x1283520b0] No default whitelist set
setsockopt(MCAST_JOIN_SOURCE_GROUP): Can't assign requested address

How to reproduce:

- Compile FFMPEG for tvOS using this build script: 
https://github.com/kewlbear/FFmpeg-iOS-build-script/blob/master/build-ffmpeg-tvos.sh

- Link with tvOS project

- Run following commands on Apple TV
	avcodec_register_all();
	av_register_all();
	avformat_network_init();
	AVDictionary *opts = 0;
	pFormatCtx = avformat_alloc_context();
	avformat_open_input(&pFormatCtx, sdpString , NULL, &opts) 

[Carl Eugen Hoyos]

Does it work if you replace line 281 of libavformat/udp.c with #if 0?
Is this supposed to work on tvOS?

[Dave]

With replaced line it works as expected.

[Carl Eugen Hoyos]

Please also test attached possible real fix.

[Dave]

That did not work. But I think only thing needed is to include TargetConditionals.h

​http://stackoverflow.com/questions/6802903/c-ifdef-mac-os-x-question

[Carl Eugen Hoyos]

New variant attached, please test.

[Dave]

Last patch is working.

[Carl Eugen Hoyos]

Should be fixed in 3c821a1a7bf21536197e68453376242bb5832687