在某些Android设备（版本4+）中播放视频时出现问题，但在其他设备上则不会播放
遵循Android开发人员的视频设置，http://developer.android.com/guide/appendix/media-formats.html我使用ffmpeg编码视频，如下所示：
ffmpeg -i gravityTrailer.mp4 -y -f mp4 -vcodec libx264 -profile:v baseline -acodec aac -strict -2 -profile:a aac_low -b:v 500k -ar 44100 -b:a 128k -ac 2 -r 30 -s 480x360 output_hq.mp4
这对应于android开发者的表2中sd高质量（上面的链接）。
然后我把这个视频放在一个服务器上，并使用android.media.MediaPlayer类来从这个URL重现它
https://cloudapp.somedomain.com/bmftvideos/output_hq.mp4
问题是视频在Android版本4+上播放
你可以看到视频：LG G2，索尼xperia S
你无法看到视频：Samsung Galaxy S4，BQ（西班牙语）aquaris 4.5
我不知道为什么
这是ffmpeg输出：
ffmpeg version 1.2.6 Copyright (c) 2000-2014 the FFmpeg developers
built on Mar 5 2014 08:21:01 with gcc 4.8.2 (GCC) 20131212 (Red Hat 4.8.2-7)
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-libass --enable-libcelt --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
libavutil 52. 18.100 / 52. 18.100
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.104 / 54. 63.104
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 42.103 / 3. 42.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x14e5ba0] stream 0, timescale not set
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x14e5ba0] max_analyze_duration 5000000 reached at 5013333 microseconds
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'gravityTrailer.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
creation_time : 2013-12-01 03:59:56
genre : Trailer
artist : Warner Bros.
title : Gravity - 2K Trailer
encoder : HandBrake 0.9.9 2013051800
date : 2013
Duration: 00:02:27.07, start: 0.000000, bitrate: 20296 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 2048x858, 20149 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Metadata:
creation_time : 2013-12-01 03:59:56
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 153 kb/s
Metadata:
creation_time : 2013-12-01 03:59:56
Stream #0:2: Video: mjpeg, yuvj420p, 102x150 [SAR 72:72 DAR 17:25], 90k tbr, 90k tbn, 90k tbc
[libx264 @ 0x1667680] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x1667680] profile Constrained Baseline, level 3.0
[libx264 @ 0x1667680] 264 - core 130 r2282 1db4621 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - 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=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output_hq.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
date : 2013
genre : Trailer
artist : Warner Bros.
title : Gravity - 2K Trailer
encoder : Lavf54.63.104
Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 480x360, q=-1--1, 500 kb/s, 15360 tbn, 30 tbc
Metadata:
creation_time : 2013-12-01 03:59:56
Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
Metadata:
creation_time : 2013-12-01 03:59:56
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> libx264)
Stream #0:1 -> #0:1 (aac -> aac)
Press [q] to stop, [?] for help
frame= 4410 fps= 65 q=-1.0 Lsize= 11154kB time=00:02:27.07 bitrate= 621.3kbits/s dup=885 drop=0
video:9062kB audio:1969kB subtitle:0 global headers:0kB muxing overhead 1.115392%
[libx264 @ 0x1667680] frame I:186 Avg QP:28.41 size: 4446
[libx264 @ 0x1667680] frame P:4224 Avg QP:29.20 size: 2001
[libx264 @ 0x1667680] mb I I16..4: 75.5% 0.0% 24.5%
[libx264 @ 0x1667680] mb P I16..4: 7.5% 0.0% 3.6% P16..4: 23.1% 6.2% 1.8% 0.0% 0.0% skip:57.7%
[libx264 @ 0x1667680] final ratefactor: 27.96
[libx264 @ 0x1667680] coded y,uvDC,uvAC intra: 24.0% 31.9% 8.6% inter: 7.4% 7.6% 0.6%
[libx264 @ 0x1667680] i16 v,h,dc,p: 58% 15% 13% 14%
[libx264 @ 0x1667680] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 9% 27% 7% 6% 8% 5% 7% 3%
[libx264 @ 0x1667680] i8c dc,h,v,p: 80% 7% 12% 2%
[libx264 @ 0x1667680] ref P L0: 84.7% 9.4% 5.9%
[libx264 @ 0x1667680] kb/s:504.98
三个建议，他们都没有直接提供解决方案，但可能导致你。
如果两次都不起作用
如果只有音频或视频只播放，则必须是那里的设置。 您的aac现在是我的主要嫌疑人。 尝试MP3，只是踢，看看会发生什么。 无论哪种方式，因为我没有流或设备，我只能说我会试验这种方式来找出问题所在。
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