<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
color:black;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.E-MailFormatvorlage17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.E-MailFormatvorlage18
{mso-style-type:personal-reply;
font-family:"Courier New";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=DE link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'>Hi Stephane, hi Arthur,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'>I am using the lossless FFV1 (AV_CODEC_ID_FFV1) codec within libav.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'>In my case, pixel format is AV_PIX_FMT_YUV422P10 (video source is SMPTE HD-SDI).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'>The compression ratio depends of course on video contents. I get ratios between 2:1 and 4:1. Lossy compression is of course far more effective, but in turn requires more time to encode.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'>Bernhard<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB><br>I don't know if it can help, but I am encoding raw video (no compression whatsoever) using codec<br>AV_CODEC_ID_RAWVIDEO with pixformat AV_PIX_FMT_RGB24 in container .avi file.<br>I too, am looking for some lossless compression but I haven't found any way yet. </span>I am a newbie to libav. <br><br><o:p></o:p></p><div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I need to create a MP4/OpenH264 file from a series of images. Because the images are all of a technical nature, I need to have absolutely no compression. How can I achieve this with OpenH264?<o:p></o:p></p><p class=MsoNormal> <span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p></div></body></html>