[FFmpeg-user] ffmpeg hangs when encoding rtmp input stream

Sat Aug 13 20:33:42 EEST 2016

Thanks for your prompt reply, Carl. Yes, it was reproductible with the
current FFmpeg head. Below you can see more information:

/root/build/FFmpeg/ffmpeg_g -loglevel debug -i
rtmp://localhost/publish/if_livestream\ live=1\ buffer=0 -c:a libfdk_aac
-b:a 64k -c:v libx264 -b:v 136K -f flv
rtmp://localhost/live/if_livestream_lo\ live=1\ timeout=0\ buffer=0 -c:a
libfdk_aac -b:a 64k -c:v libx264 -b:v 436K -f flv
rtmp://localhost/live/if_livestream_hi\ live=1\ timeout=0\ buffer=0
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
ffmpeg version N-81335-g3a81775 Copyright (c) 2000-2016 the FFmpeg
developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  configuration: --pkg-config-flags=--static --enable-gpl --enable-nonfree
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-debug
--arch=amd64
  libavutil      55. 28.100 / 55. 28.100
  libavcodec     57. 51.102 / 57. 51.102
  libavformat    57. 46.101 / 57. 46.101
  libavdevice    57.  0.102 / 57.  0.102
  libavfilter     6. 51.100 /  6. 51.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
  libpostproc    54.  0.100 / 54.  0.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging
level) with argument 'debug'.
Reading option '-i' ... matched as input file with argument
'rtmp://localhost/publish/if_livestream live=1 buffer=0'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument
'libfdk_aac'.
Reading option '-b:a' ... matched as option 'b' (video bitrate (please use
-b:v)) with argument '64k'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument
'libx264'.
Reading option '-b:v' ... matched as option 'b' (video bitrate (please use
-b:v)) with argument '136K'.
Reading option '-f' ... matched as option 'f' (force format) with argument
'flv'.
Reading option 'rtmp://localhost/live/if_livestream_lo live=1 timeout=0
buffer=0' ... matched as output file.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument
'libfdk_aac'.
Reading option '-b:a' ... matched as option 'b' (video bitrate (please use
-b:v)) with argument '64k'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument
'libx264'.
Reading option '-b:v' ... matched as option 'b' (video bitrate (please use
-b:v)) with argument '436K'.
Reading option '-f' ... matched as option 'f' (force format) with argument
'flv'.
Reading option 'rtmp://localhost/live/if_livestream_hi live=1 timeout=0
buffer=0' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input file
rtmp://localhost/publish/if_livestream live=1 buffer=0.
Successfully parsed a group of options.
Opening an input file: rtmp://localhost/publish/if_livestream live=1
buffer=0.
[rtmp @ 0x5b9b680] No default whitelist set
[rtmp @ 0x5b9b680] Detected librtmp style URL parameters, these aren't
supported by the libavformat internal RTMP handler currently enabled. See
the documentation for the correct way to pass parameters.
[tcp @ 0x5b9bc60] No default whitelist set
[rtmp @ 0x5b9b680] Handshaking...
[rtmp @ 0x5b9b680] Type answer 3
[rtmp @ 0x5b9b680] Server version 13.14.10.13
[rtmp @ 0x5b9b680] Proto = rtmp, path = /publish/if_livestream, app =
publish, fname = if_livestream
[rtmp @ 0x5b9b680] Server bandwidth = 5000000
[rtmp @ 0x5b9b680] Client bandwidth = 5000000
[rtmp @ 0x5b9b680] New incoming chunk size = 4096
[rtmp @ 0x5b9b680] Creating stream...
[rtmp @ 0x5b9b680] Sending play command for 'if_livestream'

And here is the backtrace:

(gdb) bt
#0  0x00006d71987ed680 in __poll_nocancel () from /lib64/libc.so.6
#1  0x000000000066a9f2 in ff_network_wait_fd (write=0, fd=7) at
libavformat/network.c:78
#2  ff_network_wait_fd_timeout (fd=7, write=write at entry=0, timeout=0,
int_cb=0x5b9bc90) at libavformat/network.c:90
#3  0x00000000006c4ab6 in tcp_read (h=<optimized out>, buf=0x77e9e386528f
"", size=1) at libavformat/tcp.c:207
#4  0x00000000005ca204 in retry_transfer_wrapper (transfer_func=0x6c4a90
<tcp_read>, size_min=1, size=1, buf=0x77e9e386528f "", h=0x5b9bc60)
    at libavformat/avio.c:378
#5  ffurl_read (h=h at entry=0x5b9bc60, buf=buf at entry=0x77e9e386528f "",
size=size at entry=1) at libavformat/avio.c:411
#6  0x0000000000707dda in ff_rtmp_packet_read (h=0x5b9bc60,
p=p at entry=0x77e9e3865330,
chunk_size=4096, prev_pkt=prev_pkt at entry=0x5b9b750,
    nb_prev_pkt=nb_prev_pkt at entry=0x5b9b760) at libavformat/rtmppkt.c:164
#7  0x000000000068eb22 in get_packet (s=s at entry=0x5b9b680, for_header=0) at
libavformat/rtmpproto.c:2406
#8  0x00000000006932f1 in rtmp_open (s=0x5b9b680, uri=<optimized out>,
flags=<optimized out>) at libavformat/rtmpproto.c:2837
#9  0x00000000005c9876 in ffurl_connect (uc=0x5b9b680,
options=options at entry=0x77e9e386b540)
at libavformat/avio.c:209
#10 0x00000000005c9f3a in ffurl_open_whitelist (puc=puc at entry=0x77e9e386b4a8,
filename=<optimized out>, flags=<optimized out>,
    int_cb=<optimized out>, options=0x77e9e386b540, whitelist=0x0,
blacklist=blacklist at entry=0x0, parent=parent at entry=0x0) at
libavformat/avio.c:347
#11 0x00000000005d2bc0 in ffio_open_whitelist (s=0x5b9ade0,
filename=<optimized out>, flags=<optimized out>, int_cb=<optimized out>,
    options=<optimized out>, whitelist=<optimized out>, blacklist=0x0) at
libavformat/aviobuf.c:1046
#12 0x000000000067d8b5 in io_open_default (s=<optimized out>, pb=<optimized
out>, url=<optimized out>, flags=<optimized out>,
    options=<optimized out>) at libavformat/options.c:112
#13 0x00000000006d82a3 in init_input (options=0x77e9e386b540,
filename=0x77e9e386c830 "rtmp://localhost/publish/if_livestream live=1
buffer=0",
    s=0x5b9adc0) at libavformat/utils.c:383
#14 avformat_open_input (ps=ps at entry=0x77e9e386b608,
    filename=filename at entry=0x77e9e386c830
"rtmp://localhost/publish/if_livestream live=1 buffer=0", fmt=fmt at entry=0x0,
options=0x5b9a868)
    at libavformat/utils.c:497
#15 0x000000000048d18d in open_input_file (o=o at entry=0x77e9e386b710,
filename=<optimized out>) at ffmpeg_opt.c:982
#16 0x0000000000490c5f in open_files (inout=0x137fc26 "input",
open_file=0x48b9f0 <open_input_file>, l=<optimized out>, l=<optimized out>)
    at ffmpeg_opt.c:3069
#17 ffmpeg_parse_options (argc=argc at entry=27, argv=argv at entry=0x77e9e386c4b8)
at ffmpeg_opt.c:3106
#18 0x000000000047eb0d in main (argc=27, argv=0x77e9e386c4b8) at
ffmpeg.c:4325

Thanks again,

Junior

On Sat, Aug 13, 2016 at 7:21 AM, Carl Eugen Hoyos <ceffmpeg at gmail.com>
wrote:

> Hi!
>
> 2016-08-12 15:57 GMT+02:00 Junior <wpajunior at gmail.com>:
>
> > ffmpeg version 3.1.2 Copyright (c) 2000-2016 the FFmpeg developers
>
> Is the issue reprodicible with current FFmpeg git head?
>
> Please provide a backtrace of FFmpeg when it hangs.
>
> Carl Eugen
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