我有两个mpeg-ts + h.264视频文件,我尝试使用ExoPlayer在Android设备(Samsung Tab A 10.1“)上阅读:
SimpleExoPlayerView view = new SimpleExoPlayerView(this);
TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveVideoTrackSelection.Factory(new DefaultBandwidthMeter());
TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
SimpleExoPlayer mediaPlayer = ExoPlayerFactory.newSimpleInstance(this, trackSelector, new DefaultLoadControl());
DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, getString(R.string.app_name)));
ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
MediaSource source = new ExtractorMediaSource(uri, dataSourceFactory, extractorsFactory, null, null);
view.setPlayer(mediaPlayer);
mediaPlayer.setPlayWhenReady(true);
mediaPlayer.prepare(source);
第一个成功(图像被正确显示)但第二个失败(没有显示图像),尽管它们在视频特性方面都非常相似。我想了解原因。
我使用mediainfo
来提取视频编码细节。
第一个视频(成功):
General
ID : 0 (0x0)
Complete name : 1080i.ts
Format : MPEG-TS
File size : 56.7 MiB
Duration : 47s 456ms
Overall bit rate mode : Constant
Overall bit rate : 10.0 Mbps
Video
ID : 256 (0x100)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Codec ID : 27
Duration : 47s 282ms
Bit rate : 9 185 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : MBAFF
Bits/(Pixel*Frame) : 0.148
Stream size : 51.8 MiB (91%)
第二个视频(失败):
General
ID : 1 (0x1)
Complete name : fr5.ts
Format : MPEG-TS
File size : 13.8 MiB
Duration : 32s 270ms
Overall bit rate mode : Variable
Overall bit rate : 3 557 Kbps
Video
ID : 420 (0x1A4)
Menu ID : 1045 (0x415)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : 27
Duration : 31s 760ms
Bit rate : 3 252 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : MBAFF
Bits/(Pixel*Frame) : 0.063
Stream size : 12.3 MiB (89%)
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
答案 0 :(得分:1)
突出的两个文件之间的差异是比特率。工作频率具有更高的比特率,并且它是恒定的,而损坏的比特率具有相同的高分辨率,但是比特率更低且可变。如果不了解提供的统计数据,我会责怪用于编码视频的工具。也许有关配置的事情会导致编码器输出黑帧。您是否在其他设备上尝试过相同的文件?你能用稍微不同的设置重新编码吗?