使用FFMPEG转换Android视频 [英] Converting Video for Android using FFMPEG
问题描述
我想要做的是将视频转换成将在Android中播放的mp4格式。
What i am trying to do is convert video into mp4 format that will play in Android.
我已经通过 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但是我收到错误消息对不起，此视频无法流式传输到此设备
-vcodec libx264 -vprofile baseline -acodec libfaac -ar 44100 -ac 1 -ab 128k yet I get the error message "Sorry, This Video is not valid for streaming to this device"
我在android浏览器中使用videoJS http://video-js.zencoder.com/oceans-clip.mp4 ，它工作正常。
I Played the video in android browser using videoJS http://video-js.zencoder.com/oceans-clip.mp4 and it WORKS fine.
我下载视频oceans-clip.mp4，并尝试使用极简选项转换
I download the video oceans-clip.mp4 and tried to convert using minimalist options
-y -i working.mp4 -vprofile baseline pleasework.mp4
-y -i working.mp4 -vprofile baseline pleasework.mp4
但我收到相同的错误消息。
yet I get the same error message.
以下是视频文件的FFMPEG信息转储
The following is the FFMPEG info dump of the video files
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
)
Not 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似乎没有在android中玩。任何帮助赞赏。
The metadata looks almost the same yet it doesn't seem to play in android. Any help appreciated.
推荐答案
由ffmpeg创建的MP4尾部有moov标题。这就是为什么你收到这个错误信息。 ffmpeg可以将moov标题放在前面（适合流式传输）。
The MP4 created by ffmpeg has the moov header at the tail. That is why you are getting this error message. ffmpeg can put the moov header in front (suitable for streaming).
只需运行：
ffmpeg -i <input> -c:v libx264 -c:a aac -movflags +faststart output.mp4
另请参阅< a href =https://stackoverflow.com/questions/8061798/post-processing-in-ffmpeg-to-move-moov-atom-in-mp4-files-qt-faststart>在ffmpeg中进行后处理以移动' MP4文件中的moov atom（qt-faststart）
这篇关于使用FFMPEG转换Android视频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
