[FFmpeg-trac] #2473(undetermined:new): Using ios device play mp4 with noisy sound
FFmpeg
trac at avcodec.org
Tue Apr 16 10:25:32 CEST 2013
#2473: Using ios device play mp4 with noisy sound
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Reporter: Ken_JJ | Type: defect
Status: new | Priority: normal
Component: undetermined | Version:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
I use ffmppeg to transcode video.mpg,and I play the newvideo.mp4 on
pc(window 7) and andriod device is fine,but when play it on ios
device(iphone 5 and the new ipad),the sound will noisy.
How to reproduce:
{{{
ffmpeg -i video.mpg -t 300 -vcodec libx264 -level 30 -r 25 -b:v 300k
-profile:v baseline -s 640x480 -coder 0 -acodec libfaac -ac 2 -b:a 128k
-ar 48000 newvideo.mp4
ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
built on Dec 3 2012 19:18:09 with gcc 4.1.2 (GCC) 20080704 (Red Hat
4.1.2-52)
configuration: --enable-version3 --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame
--enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid
--enable-gpl --enable-postproc --enable-nonfree --enable-network --enable-
protocol=tcp --enable-demuxer=rtsp --enable-decoder=h264
libavutil 51. 73.101 / 51. 73.101
libavcodec 54. 59.100 / 54. 59.100
libavformat 54. 29.104 / 54. 29.104
libavdevice 54. 2.101 / 54. 2.101
libavfilter 3. 17.100 / 3. 17.100
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
[mpeg @ 0xc6b3240] max_analyze_duration 5000000 reached at 5005000
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mpeg, from video.mpg':
Duration: 01:28:50.85, start: 0.280633, bitrate: 5277 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR
8:9 DAR 4:3], 6500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0xa0]: Audio: pcm_s16be, 48000 Hz, stereo, s16, 1536 kb/s
[libx264 @ 0xc6bb180] using SAR=1/1
[libx264 @ 0xc6bb180] using cpu capabilities: MMX2 SSE2Fast SSSE3
FastShuffle SSE4.2
[libx264 @ 0xc6bb180] profile Constrained Baseline, level 3.0
[libx264 @ 0xc6bb180] 264 - core 129 - H.264/MPEG-4 AVC codec - Copyleft
2003-2012 - http://www.videolan.org/x264.html - options: cabac=0 ref=3
deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00
mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0
deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 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=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1
bitrate=300 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
aq=1:1.00
Output #0, mp4, to 'newvideo.mp4':
Metadata:
encoder : Lavf54.29.104
Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x480
[SAR 1:1 DAR 4:3], q=-1--1, 300 kb/s, 25 tbn, 25 tbc
Stream #0:1: Audio: aac ([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 (pcm_s16be -> libfaac)
Press [q] to stop, [?] for help
frame= 91 fps= 39 q=47.0 Lsize= 197kB time=00:00:03.64 bitrate=
443.5kbits/s dup=0 drop=15
video:141kB audio:52kB subtitle:0 global headers:0kB muxing overhead
2.174805%
[libx264 @ 0xc6bb180] frame I:1 Avg QP:22.00 size: 923
[libx264 @ 0xc6bb180] frame P:90 Avg QP:25.82 size: 1585
[libx264 @ 0xc6bb180] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0xc6bb180] mb P I16..4: 6.0% 0.0% 0.3% P16..4: 19.6% 2.7%
1.1% 0.0% 0.0% skip:70.3%
[libx264 @ 0xc6bb180] final ratefactor: 25.61
[libx264 @ 0xc6bb180] coded y,uvDC,uvAC intra: 3.2% 27.1% 2.6% inter: 3.3%
12.3% 1.4%
[libx264 @ 0xc6bb180] i16 v,h,dc,p: 68% 18% 9% 5%
[libx264 @ 0xc6bb180] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 16% 58% 3% 2%
3% 3% 2% 2%
[libx264 @ 0xc6bb180] i8c dc,h,v,p: 76% 13% 11% 0%
[libx264 @ 0xc6bb180] ref P L0: 74.2% 13.8% 12.0%
[libx264 @ 0xc6bb180] kb/s:315.58
Received signal 2: terminating.
}}}
I try using different version ffmpeg to transcode video
1.ffmpeg 1.2
2.ffmpeg 1.06 & 1.0
3.ffmpeg 0.11.3
4.ffmpeg 0.10.7
P.S. the ffmpeg build confige is same.
1~3 version the sound is noisy,but when I use ffmpeg 0.10.7 the sound is
fine.
So,is it the version bug??
And what is it mean:
the error message "Guessed Channel Layout for Input Stream #0.1 : stereo"
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2473>
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