<div dir="ltr">Hi,<div><br></div><div>I have built a static libavcodec and I'm trying to link it to an application. I'm cross-compiling to Windows using mingw32-w64. When linking the static <span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">libavcodec to my application I get the following errors:</span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><div><span style="background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><div>/root/prefix/lib/libavcodec.a(eac3_core_bsf.o): In function `eac3_core_filter':</div><div>/root/ffmpeg-4.0/libavcodec/eac3_core_bsf.c:39: undefined reference to `ff_ac3_parse_header'</div><div>/root/ffmpeg-4.0/libavcodec/eac3_core_bsf.c:55: undefined reference to `ff_ac3_parse_header'</div></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">It appears that the static <span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">libavcodec</span> is missing symbols, <span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">ff_ac3_parse_header specifically.</span></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></span></div><div>I have made a sample build script reproducing the issue which you can find <span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">attached to this email. I'm also attaching the output of running the build script.</span></div><div><br></div><div>I would be grateful if you could point out what I'm doing wrong when building a static ffmpeg 4.0 and how to resolve this error.</div></div>