[FFmpeg-user] astreamsync freezes?

[Roger Pack]

I presume the following "shouldn't freeze forever" [it appears to...]


$ ffmpeg -i mono.wav -i mono.wav -filter_complex "astreamsync" -y output.wav

ffmpeg version N-43594-gf0896a6 Copyright (c) 2000-2012 the FFmpeg developers
  built on Aug 15 2012 21:25:48 with gcc 4.7.1 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-pthreads
--enable-runtime-cpudetect --enable-avisynth --enable-bzlib
--enable-frei0r --enable-libass --enable-libcelt
--enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libfreetype --enable-libgsm --enable-libmp3lame
--enable-libnut --enable-libopenjpeg --enable-librtmp
--enable-libschroedinger --enable-libspeex --enable-libtheora
--enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs
--enable-libxvid --enable-zlib
  libavutil      51. 69.100 / 51. 69.100
  libavcodec     54. 52.100 / 54. 52.100
  libavformat    54. 23.101 / 54. 23.101
  libavdevice    54.  2.100 / 54.  2.100
  libavfilter     3.  9.100 /  3.  9.100
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[wav @ 01fd1800] max_analyze_duration 5000000 reached at 5034667
Guessed Channel Layout for  Input Stream #0.0 : mono
Input #0, wav, from 'mono.wav':
  Metadata:
    encoder         : Lavf54.22.100 (libsndfile-1.0.24)
  Duration: 00:00:53.30, bitrate: 768 kb/s
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
mono, s16, 768 kb/s
[wav @ 02013dc0] max_analyze_duration 5000000 reached at 5034667
Guessed Channel Layout for  Input Stream #1.0 : mono
Input #1, wav, from 'mono.wav':
  Metadata:
    encoder         : Lavf54.22.100 (libsndfile-1.0.24)
  Duration: 00:00:53.30, bitrate: 768 kb/s
    Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
mono, s16, 768 kb/s
Output #0, wav, to 'output.wav':
  Metadata:
    encoder         : Lavf54.23.101
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
mono, s16, 768 kb/s
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
mono, s16, 768 kb/s
Stream mapping:
  Stream #0:0 (pcm_s16le) -> astreamsync:in1
  Stream #1:0 (pcm_s16le) -> astreamsync:in2
  astreamsync:out1 -> Stream #0:0 (pcm_s16le)
  astreamsync:out2 -> Stream #0:1 (pcm_s16le)
Press [q] to stop, [?] for help

(hangs forever).
Feedback welcome.
-r