mediaFormat QML Value Type

MediaFormat describes the format of a media file. 更多...

import 語句：

import QtMultimedia

特性

• audioCodec : enumeration
• fileFormat : enumeration
• videoCodec : enumeration

方法

• string audioCodecDescription ( codec )
• string audioCodecName ( codec )
• string fileFormatDescription ( fileFormat )
• string fileFormatName ( fileFormat )
• list<AudioCodec> supportedAudioFormats ( conversionMode )
• list<FileFormat> supportedFileFormats ( conversionMode )
• list<VideoCodec> supportedVideoCodecs ( conversionMode )
• string videoCodecDescription ( codec )
• string videoCodecName ( codec )

詳細描述

The MediaFormat type describes the format of a media file. It contains three properties that describe the file type and the audio and video codecs that are being used.

MediaFormat can be used to specify the type of file that should be created by a MediaRecorder . The snippet below shows an example that sets up the recorder to create an mpeg4 video with AAC encoded audio and H265 video:

CaptureSession {
    ... // setup inputs
    MediaRecorder {
        mediaFormat {
            fileFormat: MediaFormat.MPEG4
            audioCodec: MediaFormat.AudioCodec.AAC
            videoCodec: MediaFormat.VideoCodec.H265
        }
    }
}
					

If the specified mediaFormat is not supported, the MediaRecorder will automatically try to find the best possible replacement format and use that instead.

另請參閱 MediaRecorder and CaptureSession .

特性文檔編製

audioCodec : enumeration

Describes the audio codec used in multimedia file or stream. It can take one of the following values:

Property value	描述
MediaFormat.WMA	WMA (Windows 媒體音頻)
MediaFormat.AC3	杜比數字
MediaFormat.AAC	AAC (高級音頻編碼)
MediaFormat.ALAC	ALAC (Apple 無損音頻編解碼器)
MediaFormat.DolbyTrueHD	杜比 TrueHD
MediaFormat.EAC3	杜比數字 + (EAC3)
MediaFormat.MP3	MPEG-1 音頻層 III (或 MPEG-2 音頻層 III)
MediaFormat.Wave	波形音頻文件格式
MediaFormat.Vorbis	Ogg Vorbis
MediaFormat.FLAC	FLAC (自由無損音頻編解碼器)
MediaFormat.Opus	Opus 音頻格式
MediaFormat.Unspecified	未指定編解碼器

fileFormat : enumeration

Describes the container format used in a multimedia file or stream. It can take one of the following values:

Property value	描述
MediaFormat.WMA	WMA (Windows 媒體音頻)
MediaFormat.AAC	AAC (高級音頻編碼)
MediaFormat.Matroska	Matroska (MKV)
MediaFormat.WMV	WMV (Windows 媒體視頻)
MediaFormat.MP3	MPEG-1 音頻層 III (或 MPEG-2 音頻層 III)
MediaFormat.Wave	波形音頻文件格式
MediaFormat.Ogg	Ogg
MediaFormat.MPEG4	MPEG-4
MediaFormat.AVI	AVI (音頻視頻交錯)
MediaFormat.QuickTime	QuickTime
MediaFormat.WebM	WebM
MediaFormat.Mpeg4Audio	MPEG-4 第 3 部分或 MPEG-4 音頻 (正式 ISO/IEC 14496-3)
MediaFormat.FLAC	FLAC (自由無損音頻編解碼器)
MediaFormat.UnspecifiedFormat	The format is unspecified.

videoCodec : enumeration

Describes the video codec used in multimedia file or stream. It can take one of the following values:

Property value	描述
MediaFormat.VP8	VP8
MediaFormat.MPEG2	MPEG-2
MediaFormat.MPEG1	MPEG-1
MediaFormat.WMV	WMV (Windows 媒體視頻)
MediaFormat.H265	High Efficiency Video Coding (HEVC)
MediaFormat.H264	Advanced Video Coding
MediaFormat.MPEG4	MPEG-4
MediaFormat.AV1	AOMedia Video 1
MediaFormat.MotionJPEG	MotionJPEG
MediaFormat.VP9	VP9
MediaFormat.Theora	Theora
MediaFormat.Unspecified	Video codec not specified