 until it reaches 0, at which point the full frame is decoded. The number of fragment rows made available in each call depends on the pixel format and the number of post-processing filters enabled, and may not even be constant for the entire frame. If a non-<code>NULL</code> <em>_granpos</em> pointer is passed to <a class="el" href="group__decfuncs.html#ga31c814bf09b2232aff69c57ae20f04eb" title="Submits a packet containing encoded video data to the decoder.">th_decode_packetin()</a>, the granule position fo