Hi Firstly thanks for a great piece of software and I hope you can help with a problem I have encountered.
When selecting Render and choosing the format "MP4 - the dominating format (H264/AAC)" the render option is disabled with the error Unsupported video codec: libx264 (attached screenshot) Looking at the code in renderwidget.cpp it checks the codec defined in the project profile against a list of video codecs obtained from MLT and sure enough libx264 is not in that list. I've been told that this is because "libx264 is not a codec, it's an encoder implementation of a codec". I confess I'm not sure I understand the distinction but doing some tests: [terry@localhost ~]$ melt -query video_codecs | grep 264 - h264_nvenc - h264_v4l2m2m - h264_vaapi - nvenc_h264 - h264 - h264_cuvid I believe that is the command equivalent of how renderwidget populates vcodecsList and libx264 is not there. However I can run a command like: melt avformat:DarkStar.webm -consumer avformat:output.mp4 acodec=aac vcodec=libx264 and it works just fine. Looking at how ffmpeg sees things seems to confirm what I was told. [terry@localhost ~]$ ffmpeg -codecs | grep 264 ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9.3.0 (PCLinuxOS 9.3.0-1pclos2020) configuration: --prefix=/usr --enable-shared --enable-pic --libdir=/usr/lib64 --shlibdir=/usr/lib64 --incdir=/usr/include --extra-cflags=-I/usr/include/nvenc --disable-stripping --enable-postproc --enable-gpl --enable-pthreads --enable-libtheora --enable-libvorbis --disable-encoder=vorbis --enable-libvpx --enable-runtime-cpudetect --enable-libdc1394 --enable-librtmp --enable-libspeex --enable-libfreetype --enable-libgsm --enable-libcelt --enable-libopus --enable-libopencv --enable-libopenjpeg --enable-libtwolame --enable-libxavs --enable-frei0r --enable-libmodplug --enable-libass --enable-gnutls --enable-libcdio --enable-libpulse --enable-libv4l2 --enable-avresample --enable-opencl --enable-libmp3lame --enable-libaom --enable-sndio --enable-libdav1d --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3 --enable-libx264 --enable-libx265 --enable-libvo-amrwbenc --enable-libxvid --enable-decoder=atrac3 --enable-decoder=atrac3p --enable-libwebp --enable-libfdk-aac --enable-nonfree --enable-cuda --enable-cuvid --enable-nvenc --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100 DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_v4l2m2m h264_cuvid ) (encoders: libx264 libx264rgb h264_nvenc h264_v4l2m2m h264_vaapi nvenc nvenc_h264 ) I was told instead to do: [terry@localhost ~]$ ffmpeg -encoders | grep 264 ... V..... libx264 libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (codec h264) V..... libx264rgb libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGB (codec h264) V..... h264_nvenc NVIDIA NVENC H.264 encoder (codec h264) V..... h264_v4l2m2m V4L2 mem2mem H.264 encoder wrapper (codec h264) V..... h264_vaapi H.264/AVC (VAAPI) (codec h264) V..... nvenc NVIDIA NVENC H.264 encoder (codec h264) V..... nvenc_h264 NVIDIA NVENC H.264 encoder (codec h264) I don't know what the equivalent MLT query would be for that. I must confess I don't really know whether the problem lies in MLT or kdenlive. I'm hoping maybe someone here can shed some light on this for me. Software versions in use: kdenlive-20.04.2 mlt-6.20.0 ffmpeg-4.3 x264-1.157.20190309 Thanks in advance, Terry
