为什么H.264，MPEG-4 HE AAC在iphoneXS/Max上停止工作? [英] Why did H.264, MPEG-4 HE AAC stop working on iphoneXS/Max?
问题描述
有关新硬件的问题
我一直在疯狂地进行调查，但是没有发现任何暗示为什么我的H.264编码视频无法在这些新设备上运行.
I have been investigating like crazy, and haven't found any hints to why my H.264 encoded videos have stopped working on these new devices.
上下文:直接从ios设备将原始文件发送到s3，aws弹性代码转换器然后将原始文件编码为压缩程度更高的H.264预设.截至昨天，一位同事报告说所有视频均为黑色"，因为自从这些设备的交付已实现以来，我得到了确认.无法在模拟器上重现此问题.未播放的编码视频，我在下面列出了exif数据.
Context: Direct from the ios device, the original is sent to s3, aws elastic transcoder then encodes the original into a more compressed H.264 preset. As of yesterday, a coworker was reporting all videos being "black", now since deliveries on these devices are being fulfilled, i've gotten confirmation. Cannot reproduce this issue on simulator. The encoded videos that are not playing, i've listed the exif data below.
是否有人在编解码器领域具有专业知识，您能权衡一下为什么在iphoneX及以下版本的设备没有问题的情况下，新设备无法解码此H.264视频吗?
Is there is anyone out there with a domain expertise in codecs, can you weigh in why a new device would fail to decode this H.264 video when devices since iphoneX and below have no problem?
➜ Downloads exiftool 30B3485D-24A3-4B6D-8B27-15B7C11FB864.mp4
ExifTool Version Number : 11.10
File Name : 30B3485D-24A3-4B6D-8B27-15B7C11FB864.mp4
Directory : .
File Size : 202 kB
File Modification Date/Time : 2018:09:24 20:35:47-07:00
File Access Date/Time : 2018:09:24 20:36:02-07:00
File Inode Change Date/Time : 2018:09:24 20:35:53-07:00
File Permissions : rw-r--r--
File Type : MP4
File Type Extension : mp4
MIME Type : video/mp4
Major Brand : MP4 Base Media v1 [IS0 14496-12:2003]
Minor Version : 0.2.0
Compatible Brands : isom, iso2, avc1, mp41
Movie Header Version : 0
Create Date : 0000:00:00 00:00:00
Modify Date : 0000:00:00 00:00:00
Time Scale : 1000
Duration : 4.12 s
Preferred Rate : 1
Preferred Volume : 100.00%
Preview Time : 0 s
Preview Duration : 0 s
Poster Time : 0 s
Selection Time : 0 s
Selection Duration : 0 s
Current Time : 0 s
Next Track ID : 3
Track Header Version : 0
Track Create Date : 0000:00:00 00:00:00
Track Modify Date : 0000:00:00 00:00:00
Track ID : 1
Track Duration : 4.12 s
Track Layer : 0
Track Volume : 100.00%
Balance : 0
Audio Format : mp4a
Audio Channels : 2
Audio Bits Per Sample : 16
Audio Sample Rate : 48000
Matrix Structure : 1 0 0 0 1 0 0 0 1
Image Width : 320
Image Height : 568
Media Header Version : 0
Media Create Date : 0000:00:00 00:00:00
Media Modify Date : 0000:00:00 00:00:00
Media Time Scale : 15360
Media Duration : 4.00 s
Media Language Code : und
Handler Description : VideoHandler
Graphics Mode : srcCopy
Op Color : 0 0 0
Compressor ID : avc1
Source Image Width : 320
Source Image Height : 568
X Resolution : 72
Y Resolution : 72
Bit Depth : 24
Pixel Aspect Ratio : 1:1
Video Frame Rate : 30
Handler Type : Metadata
Handler Vendor ID : Apple
Encoder : Lavf57.71.100
Movie Data Size : 202178
Movie Data Offset : 4545
Avg Bitrate : 393 kbps
Image Size : 320x568
Megapixels : 0.182
Rotation : 0
推荐答案
此错误已在iOS13 beta版中为我自己解决.苹果回到我身边，通知我说H264标头说我的视频是4.0版，但第一个H264帧说是3.1，iOS12不允许.
This bug resolved itself for me in iOS13 beta release. Apple got back to me and informed me that the H264 header said that my video was version 4.0 but the first H264 frame says that it's 3.1, and iOS12 will not allow that.
我可以通过将标头版本指定为3.1来解决此问题
I was able to fix this in code by specifying my header version as 3.1
这篇关于为什么H.264，MPEG-4 HE AAC在iphoneXS/Max上停止工作?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！
