<html><head></head><body><div class="ydp4b46aa55yahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div>Hi,</div><div><br></div><div dir="ltr" data-setdir="false">I am trying to <span>produce </span>files that are as similar as possible to the Sony XAVC Long GOP encoders. To create the fixed GOP pattern IBBPBB...PBB with a GOP length of 24 frames, I used the following parameters:</div><div>--keyint 24 --bframes 2 --b-adapt 0 --no-weightb --weightp 0 --open-gop --no-scenecut</div></div><div><br></div><div><div dir="ltr" data-setdir="false">Unfortunately, this only works from the second GOP onwards, tested with 1080p50, <span>csp i422</span>, 10 Bit input/output. The first GOP is only 22 frames long and sets a P-frame as the second frame. Perhaps this is due to the fact that an IDR frame is generated first, which according to the documentation contradicts an open GOP.</div><div>However, the Sony encoder also generates an IDR frame first and then the two B frames.</div></div><div><br></div><span>Is it possible to get the x264 encoder to also generate the first GOP with the specified pattern (with IDR frame) and length?</span><br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><span>Thomas</span></div></div></body></html>