我想做的是将视频转换成mp4格式，将在Android上播放。
我已经看过http://developer.android.com/guide/appendix/media-formats.html
我正在设置以下选项
-vcodec libx264 -vprofile baseline -acodec libfaac -ar 44100 -ac 1 -ab 128k
但我得到错误消息"对不起，这个视频是无效的流式传输到这个设备"
我在android浏览器中使用videoJS http://video-js.zencoder.com/oceans-clip.mp4播放视频，效果很好。
我下载了视频oceans-clip.mp4，并尝试使用极简选项进行转换
-y -i working.mp4 -vprofile baseline pleasework.mp4
但我得到相同的错误信息。
下面是视频文件的FFMPEG信息转储
Working.mp4
Array
(
[0] => ffmpeg version N-40229-g24e3f44-syslint Copyright (c) 2000-2012 the FFmpeg developers
[1] => built on Apr 29 2012 22:01:41 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
[2] => configuration: --prefix=/usr/local/cpffmpeg --enable-shared --enable-nonfree --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-decoder=liba52 --enable-libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --extra-cflags=-I/usr/local/cpffmpeg/include/ --extra-ldflags=-L/usr/local/cpffmpeg/lib --enable-version3 --extra-version=syslint
[3] => libavutil 51. 48.100 / 51. 48.100
[4] => libavcodec 54. 17.101 / 54. 17.101
[5] => libavformat 54. 3.100 / 54. 3.100
[6] => libavdevice 53. 4.100 / 53. 4.100
[7] => libavfilter 2. 72.100 / 2. 72.100
[8] => libswscale 2. 1.100 / 2. 1.100
[9] => libswresample 0. 11.100 / 0. 11.100
[10] => libpostproc 52. 0.100 / 52. 0.100
[11] => Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'working.mp4':
[12] => Metadata:
[13] => major_brand : isom
[14] => minor_version : 1
[15] => compatible_brands: isomavc1
[16] => creation_time : 2010-05-18 04:24:00
[17] => Duration: 00:00:46.54, start: 0.000000, bitrate: 3342 kb/s
[18] => Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x264 [SAR 132:133 DAR 320:133], 3195 kb/s, SAR 127:128 DAR 635:264, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
[19] => Metadata:
[20] => creation_time : 2010-05-18 04:24:00
[21] => handler_name : GPAC ISO Video Handler
[22] => Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 144 kb/s
[23] => Metadata:
[24] => creation_time : 2010-05-18 04:24:01
[25] => handler_name : GPAC ISO Audio Handler
[26] => At least one output file must be specified
)
不是Working.mp4
Array
(
[0] => ffmpeg version N-40229-g24e3f44-syslint Copyright (c) 2000-2012 the FFmpeg developers
[1] => built on Apr 29 2012 22:01:41 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
[2] => configuration: --prefix=/usr/local/cpffmpeg --enable-shared --enable-nonfree --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-decoder=liba52 --enable-libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --extra-cflags=-I/usr/local/cpffmpeg/include/ --extra-ldflags=-L/usr/local/cpffmpeg/lib --enable-version3 --extra-version=syslint
[3] => libavutil 51. 48.100 / 51. 48.100
[4] => libavcodec 54. 17.101 / 54. 17.101
[5] => libavformat 54. 3.100 / 54. 3.100
[6] => libavdevice 53. 4.100 / 53. 4.100
[7] => libavfilter 2. 72.100 / 2. 72.100
[8] => libswscale 2. 1.100 / 2. 1.100
[9] => libswresample 0. 11.100 / 0. 11.100
[10] => libpostproc 52. 0.100 / 52. 0.100
[11] => Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pleasework.mp4':
[12] => Metadata:
[13] => major_brand : isom
[14] => minor_version : 512
[15] => compatible_brands: isomiso2avc1mp41
[16] => creation_time : 2010-05-18 04:24:00
[17] => encoder : Lavf54.3.100
[18] => Duration: 00:00:46.54, start: 0.000000, bitrate: 1843 kb/s
[19] => Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x264 [SAR 127:128 DAR 635:264], 1715 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
[20] => Metadata:
[21] => creation_time : 2010-05-18 04:24:00
[22] => handler_name : VideoHandler
[23] => Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 124 kb/s
[24] => Metadata:
[25] => creation_time : 2010-05-18 04:24:00
[26] => handler_name : SoundHandler
[27] => At least one output file must be specified
)
元数据看起来几乎一样，但它似乎不能在android中发挥作用。
由ffmpeg创建的MP4在尾部有moov标头。这就是为什么你得到这个错误消息。Ffmpeg可以把moov头放在前面(适合流媒体)。
简单地运行:
ffmpeg -i <input> -c:v libx264 -c:a aac -movflags +faststart output.mp4
也可参考ffmpeg中的后处理来移动'moov原子'
libfaac已不支持，您可以使用以下配置:
ffmpeg -i <input> -s 480x320 -vcodec mpeg4 -acodec aac -strict -2 -ac 1 -ar 16000 -r 13 -ab 32000 -aspect 3:2 <output>
我的解决方案是:
ffmpeg -i <INPUT_VIDEO> -c:v libx264 -profile:v baseline -c:a libvo_aacenc -ar 44100 -ac 2 -b:a 128k -movflags faststart output.mp4
我使用的是Ubuntu 16.04.1 LTS
我的解决方案是:
ffmpeg -y -i input_file.mp4 -s 352x288 -b:v 384k -flags +loop+mv4 -cmp 256 -partitions +parti4x4+parti8x8+partp4x4+partp8x8 -subq 6 -trellis 0 -refs 5 -bf 0 -coder 0 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 -c:a aac -ac 1 -ar 16000 -r 13 -ab 32000 -aspect 3:2 -strict experimental output_file.3gp
我转换为3gp。它可以在API 16或更高版本中使用VideoView。
我在这里做的是用我的Android设备录制视频，看看它配置了什么FFMPEG:
C:UsersmuradguiDocumentsSmartTrustSoftwareffmpeg-20170418-6108805-win64-staticbin>ffmpeg -i android.mp4
ffmpeg version N-85588-g6108805 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 6.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avis
e-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --e
m --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpe
-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enabl
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil 55. 61.100 / 55. 61.100
libavcodec 57. 93.100 / 57. 93.100
libavformat 57. 72.101 / 57. 72.101
libavdevice 57. 7.100 / 57. 7.100
libavfilter 6. 84.101 / 6. 84.101
libswscale 4. 7.101 / 4. 7.101
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
[h264 @ 00000000003184e0] no frame!
[aac @ 000000000050c900] Input buffer exhausted before END element found
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'android.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2018-03-08T17:30:26.000000Z
com.android.version: 6.0.1
Duration: 00:00:00.86, start: 0.000000, bitrate: 2160 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 720x1280, 2107 kb/s, 31.72 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2018-03-08T17:30:26.000000Z
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 56 kb/s (default)
Metadata:
creation_time : 2018-03-08T17:30:26.000000Z
handler_name : SoundHandle
At least one output file must be specified
我不是很懂技术，但这是最吸引我注意的:
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 720x1280, 2107 kb/s, 31.72 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
我使用以下命令成功地转换我的视频，以便它可以在我的Android上播放:
ffmpeg -i out.avi -vcodec h264 -s 720x1280 test3.mp4
我怀疑我的问题是我的原始视频的分辨率对我的设备来说太高了。这是之前的内容:
C:UsersmuradguiDocumentsSmartTrustSoftwareffmpeg-20170418-6108805-win64-staticbin>ffmpeg -i out.avi
ffmpeg version N-85588-g6108805 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 6.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-zma --enable-zlib
libavutil 55. 61.100 / 55. 61.100
libavcodec 57. 93.100 / 57. 93.100
libavformat 57. 72.101 / 57. 72.101
libavdevice 57. 7.100 / 57. 7.100
libavfilter 6. 84.101 / 6. 84.101
libswscale 4. 7.101 / 4. 7.101
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Input #0, avi, from 'out.avi':
Metadata:
encoder : Lavf57.72.101
Duration: 00:00:10.00, start: 0.000000, bitrate: 4788 kb/s
Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 2250x4000 [SAR 1:1 DAR 9:16], 4596 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 192 kb/s
分辨率为2250x4000(它是来自我在本文中转换为视频的同一设备的图像https://superuser.com/questions/617392/ffmpeg-image-sequence-with-various-durations)。
我尝试简单地调整图像大小，而不将编解码器更改为h264，但这并没有产生非常好的图像。H264为我做了:)
希望这有帮助!!& lt; 3