[FFmpeg-trac] #2860(undetermined:new): -ac downmix fails.

FFmpeg trac at avcodec.org
Tue Aug 13 23:18:36 CEST 2013


#2860: -ac downmix fails.
-------------------------------------+-------------------------------------
             Reporter:  Mista_D      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 "-AC 2" filter doesn't downmix properly. The output has surround channels
 only.

 Source sample: https://www.dropbox.com/s/dvurxjsjbu3f3fk/disk11.ts?m


 ffmpeg -i disk11.ts -ac 2 -t 100 100.mp4
     ffmpeg version 2.0 Copyright (c) 2000-2013 the FFmpeg developers
       built on Aug  6 2013 16:10:49 with gcc 4.1.2 (GCC) 20080704 (Red Hat
 4.1.2-52)
       configuration: --enable-static --enable-postproc --enable-gpl
 --enable-avfilter --enable-libx264 --enable-libxvid --enable-libmp3lame
 --enable-libfaac --enable-pthreads --enable-swscale --enable-runtime-
 cpudetect --disable-devices --disable-avdevice --extra-ldflags=-static
 --disable-shared --enable-bzlib --enable-zlib --extra-libs='-lx264
 -lxvidcore -lmp3lame -lpthread -lm -lbz2 -lz -lpthread -lvpx -lass
 -lfontconfig -lexpat -lfreetype -lfaac' --disable-encoder=libgsm
 --disable-decoder=libgsm --disable-doc --enable-libvpx --enable-libass
 --enable-version3 --enable-nonfree --enable-libfreetype
       libavutil      52. 38.100 / 52. 38.100
       libavcodec     55. 18.102 / 55. 18.102
       libavformat    55. 12.100 / 55. 12.100
       libavfilter     3. 79.101 /  3. 79.101
       libswscale      2.  3.100 /  2.  3.100
       libswresample   0. 17.102 /  0. 17.102
       libpostproc    52.  3.100 / 52.  3.100
     Input #0, mpegts, from 'disk11.ts':
       Duration: 01:38:47.88, start: 0.221700, bitrate: 59026 kb/s
       Program 1
         Stream #0:0[0x1e1]: Video: mpeg2video (Main) ([2][0][0][0] /
 0x0002), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k
 tbn, 47.95 tbc
         Stream #0:1[0x1e2]: Audio: s302m (BSSD / 0x44535342), 48000 Hz, 8
 channels (FL+FR+FC+LFE+BL+BR+DL+DR), s16, 7680 kb/s
     [libx264 @ 0xc410c40] using SAR=1/1
     [libx264 @ 0xc410c40] using cpu capabilities: MMX2 SSE2Fast SSSE3
 SSE4.2
     [libx264 @ 0xc410c40] profile High, level 4.0
     [libx264 @ 0xc410c40] 264 - core 135 - H.264/MPEG-4 AVC codec -
 Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1
 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1
 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12
 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0
 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23
 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0
 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
     Output #0, mp4, to '100.mp4':
       Metadata:
         encoder         : Lavf55.12.100
         Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021),
 yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24k tbn, 23.98 tbc
         Stream #0:1: Audio: aac (libfaac) ([64][0][0][0] / 0x0040), 48000
 Hz, stereo, s16, 128 kb/s
     Stream mapping:
       Stream #0:0 -> #0:0 (mpeg2video -> libx264)
       Stream #0:1 -> #0:1 (s302m -> libfaac)
     Press [q] to stop, [?] for help
     frame= 2398 fps= 20 q=-1.0 Lsize=   38380kB time=00:01:40.01
 bitrate=3143.7kbits/s dup=3 drop=0
     video:36750kB audio:1563kB subtitle:0 global headers:0kB muxing
 overhead 0.175016%
     [libx264 @ 0xc410c40] frame I:15    Avg QP:14.89  size: 56463
     [libx264 @ 0xc410c40] frame P:961   Avg QP:21.33  size: 28671
     [libx264 @ 0xc410c40] frame B:1422  Avg QP:22.22  size:  6492
     [libx264 @ 0xc410c40] consecutive B-frames: 11.4% 26.1%  7.3% 55.2%
     [libx264 @ 0xc410c40] mb I  I16..4: 38.8% 58.7%  2.5%
     [libx264 @ 0xc410c40] mb P  I16..4:  5.0% 13.5%  0.4%  P16..4: 35.7%
 9.1%  4.1%  0.0%  0.0%    skip:32.2%
     [libx264 @ 0xc410c40] mb B  I16..4:  0.5%  0.9%  0.0%  B16..8: 24.4%
 1.9%  0.3%  direct: 1.6%  skip:70.3%  L0:40.7% L1:54.9% BI: 4.3%
     [libx264 @ 0xc410c40] 8x8 transform intra:70.0% inter:83.8%
     [libx264 @ 0xc410c40] coded y,uvDC,uvAC intra: 45.1% 49.5% 10.1%
 inter: 11.3% 13.0% 0.6%
     [libx264 @ 0xc410c40] i16 v,h,dc,p: 32% 27%  6% 36%
     [libx264 @ 0xc410c40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 18% 29%  4%
 5%  6%  5%  5%  5%
     [libx264 @ 0xc410c40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 18% 17%  5%
 9%  8%  7%  5%  3%
     [libx264 @ 0xc410c40] i8c dc,h,v,p: 59% 20% 18%  4%
     [libx264 @ 0xc410c40] Weighted P-Frames: Y:15.9% UV:10.1%
     [libx264 @ 0xc410c40] ref P L0: 60.2% 19.2% 15.5%  4.9%  0.3%
     [libx264 @ 0xc410c40] ref B L0: 90.6%  8.4%  1.1%
     [libx264 @ 0xc410c40] ref B L1: 97.7%  2.3%
     [libx264 @ 0xc410c40] kb/s:3010.02

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2860>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker


More information about the FFmpeg-trac mailing list