undefined symbol: ff_avc_parse_nal_units_buf

[adarshdec23]

Hi! Thank you for your HEVC guide. I've tried following, but when I compile the code with autoninja I get the following error:

ninja: Entering directory `out/Default'
[1/85] SOLINK ./libffmpeg.so
FAILED: libffmpeg.so libffmpeg.so.TOC 
python "../../build/toolchain/gcc_solink_wrapper.py" --readelf="readelf" --nm="nm" --sofile="./libffmpeg.so" --tocfile="./libffmpeg.so.TOC" --output="./libffmpeg.so" -- ../../third_party/llvm-build/Release+Asserts/bin/clang++ -shared -Wl,-Bsymbolic -L gen/third_party/ffmpeg -Wl,--fatal-warnings -fPIC -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,defs -Wl,--as-needed -fuse-ld=lld -Wl,--icf=all -Wl,--color-diagnostics -m64 -Werror -Wl,-O2 -Wl,--gc-sections -rdynamic -nostdlib++ --sysroot=../../build/linux/debian_sid_amd64-sysroot -L../../build/linux/debian_sid_amd64-sysroot/usr/local/lib/x86_64-linux-gnu -L../../build/linux/debian_sid_amd64-sysroot/lib/x86_64-linux-gnu -L../../build/linux/debian_sid_amd64-sysroot/usr/lib/x86_64-linux-gnu -Wl,-rpath=\$ORIGIN -o "./libffmpeg.so" -Wl,-soname="libffmpeg.so" @"./libffmpeg.so.rsp"
ld.lld: error: undefined symbol: ff_avc_parse_nal_units_buf
>>> referenced by autorename_libavformat_hevc.c
>>>               obj/third_party/ffmpeg/ffmpeg_internal/autorename_libavformat_hevc.o:(ff_hevc_annexb2mp4)

ld.lld: error: undefined symbol: ff_avc_parse_nal_units
>>> referenced by autorename_libavformat_hevc.c
>>>               obj/third_party/ffmpeg/ffmpeg_internal/autorename_libavformat_hevc.o:(ff_hevc_annexb2mp4)

ld.lld: error: undefined symbol: ff_avc_parse_nal_units_buf
>>> referenced by autorename_libavformat_hevc.c
>>>               obj/third_party/ffmpeg/ffmpeg_internal/autorename_libavformat_hevc.o:(ff_isom_write_hvcc)
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

Any help would be appreciated. Thanks!

[chrme]

@adarshdec23: you should understand dependencies.. if you search for ff_avc_parse_nal_units_buf then you see that it's in the file "avformat/avc.c", try to include it

[adarshdec23]

Indeed that was my first try too, if you mean to include the header (.h) file instead of the "c" file. This is the step the causes the issue: `then go to src/third_party/ffmpeg folder and copy:

libavcodec/hevcdec.c to libavcodec/autorename_libavcodec_hevcdec.c
libavformat/hevc.c to libavformat/autorename_libavformat_hevc.c

Since the files are literal copies, this should not happen. When I looked at other similar files (auto_rename*) the usually contain exactly one line, #include "original_file.c". So I tried this out too and it did not work.

[chrme]

@adarshdec23 so are you compile with hevc in the end?

[adarshdec23]

Yes that is what I was trying with autoninja -C out/Default chrome. Could the problem be that since the files have been manually copied instead of auto generated, the linker is somehow not picking it up?