Opened 3 years ago

Closed 3 years ago

#2860 closed defect (duplicate)

-ac downmix fails.

Reported by: Mista_D Owned by:
Priority: normal Component: undetermined
Version: unspecified Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

"-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

Change History (1)

comment:1 Changed 3 years ago by llogan

  • Resolution set to duplicate
  • Status changed from new to closed

Duplicate of ticket #2859.

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