4/13/2023 0 Comments Directshow decoder dmg file![]() ![]() ![]() The assumption underlying this calculation is that all audio samples in the stream are of equal duration however, the samples output by the DMO are not of equal duration, and so the time stamps applied by the AVI Splitter are not accurate. In DirectShow, the AVI Splitter filter manufactures time stamps for each group of samples (each audio frame) based on the nAvgBytesPerSec value in the WAVEFORMATEX structure in the AVI stream header. AVI files do not provide a time stamp for each audio sample or group of samples. It therefore works best with file container formats that use time stamps. The audio encoder DMO outputs samples of varying duration, even when in "constant bit rate" mode. For more information, see Storing Compressed Media in AVI Files. However, the Windows Media Audio and Video codec interfaces do not support WMA in AVI files because it is impossible, using the default DirectShow AVI playback filters, to maintain audio-video sync in an AVI file with a WMA stream. You can use DirectShow to encode WMA streams into any file container format for which you have a multiplexer filter. In other words, you will be using the IMediaObject interface instead of IMFTransform. If you are going to use standalone codecs with DirectShow, you will probably want to use them as DMOs only.
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