[FFmpeg-user] amix filter hanging

[Jonathan Girven]

I am still finding that the amix filter hangs in the current git master
branch.
I thought I would share links to some example files if anyone was interested
in trying to reproduce the issue:

BigBuckBunny_320x180_t10.mp4
<http://www.ffmpeg-archive.org/file/n4680975/BigBuckBunny_320x180_t10.mp4>  

full_dillon_in_pro_audio.mp3
<http://www.ffmpeg-archive.org/file/n4680975/full_dillon_in_pro_audio.mp3>  

Here is the output from the command I am using:

$ ffmpeg -y -i BigBuckBunny_320x180_t10.mp4 -i full_dillon_in_pro_audio.mp3
-filter_complex "[1:a][0:a]amix=inputs=2[m]" -map 0:v -map [m] -c:v libx264
-preset ultrafast -c:a aac output.mp4
ffmpeg version N-87042-gf8d0689 Copyright (c) 2000-2017 the FFmpeg
developers
  built with gcc 4.9.2 (Debian 4.9.2-10)
  configuration: --prefix=/usr/local --extra-cflags=-I/usr/local/include
--extra-ldflags=-L/usr/local/lib --bindir=/usr/local/bin --disable-doc
--disable-static --enable-shared --disable-ffplay --extra-libs=-ldl
--enable-version3 --enable-libfreetype --enable-libx264 --enable-gpl
--enable-openssl --enable-nonfree --disable-debug
  libavutil      55. 74.100 / 55. 74.100
  libavcodec     57.103.100 / 57.103.100
  libavformat    57. 77.100 / 57. 77.100
  libavdevice    57.  7.101 / 57.  7.101
  libavfilter     6.100.100 /  6.100.100
  libswscale      4.  7.103 /  4.  7.103
  libswresample   2.  8.100 /  2.  8.100
  libpostproc    54.  6.100 / 54.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'BigBuckBunny_320x180_t10.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : Big Buck Bunny
    artist          : Blender Foundation
    composer        : Blender Foundation
    date            : 2008
    encoder         : Lavf57.68.100
  Duration: 00:00:10.01, start: 0.000000, bitrate: 277 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
320x180 [SAR 1:1 DAR 16:9], 143 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc
(default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[mp3 @ 0x1cbb740] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from 'full_dillon_in_pro_audio.mp3':
  Metadata:
    title           : Dillon in Pro Audio
    artist          : Jingle Punks
    album           : YouTube Audio Library
    genre           : Dance & Electronic
    encoder         : Google
  Duration: 00:01:18.84, start: 0.000000, bitrate: 320 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
Stream mapping:
  Stream #0:1 (aac) -> amix:input1 (graph 0)
  Stream #1:0 (mp3) -> amix:input0 (graph 0)
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  amix (graph 0) -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 0x1cd7b80] using SAR=1/1
[libx264 @ 0x1cd7b80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x1cd7b80] profile Constrained Baseline, level 1.2
[libx264 @ 0x1cd7b80] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft
2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 ref=1
deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0
me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1
chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0
decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0
weightp=0 keyint=250 keyint_min=24 scenecut=0 intra_refresh=0 rc=crf
mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : Big Buck Bunny
    artist          : Blender Foundation
    composer        : Blender Foundation
    date            : 2008
    encoder         : Lavf57.77.100
    Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661),
yuv420p(progressive), 320x180 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 12288
tbn, 24 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc57.103.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
    Metadata:
      encoder         : Lavc57.103.100 aac
<hang for more than 10 minutes>




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