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If the extension identifies the sample as interlaced, the encoder maintains the sample interlacing in the compressed stream, and embeds an indication flag in the stream so that the decoder can identify interlaced frames.
Each interlaced sample is marked, so that source content that is a mix of progressive and interlaced can be encoded into a stream together. The Windows Media Format SDK writer object includes the content type data unit extensions in the samples that it writes to the data section of the ASF container for use at the time of rendering.
The decoder identifies interlaced samples based on the flag set in the stream by the encoder. As a default, the decoder deinterlaces the samples and delivers progressive outputs. The difficulty in interlaced video playback arises after the decoder delivers the samples. The renderer video card or chip in a device cannot properly display the video content without knowing which field is which. In applications using the Windows Media Format SDK, the content type data unit extension is retrieved from the uncompressed samples, and can be passed to the device.
When using the codec objects directly, none of this data transfer is automatic. You must implement data-unit-extension support, both in your buffer objects and in the container that you use for your encoded content.
Most common types of media containers like AVI do not support sample-level metadata. You can implement your own system to store the data in the file and associate it with individual samples, but only a customized reader would be able to retrieve it.
Set the encoder for interlaced encoding only if you have interlaced samples to deliver. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.
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