Hi Terry, Thanks for the detailed description of the problem. Could you please precise how you installed Kdenlive and on which distribution?
Cheers, Camille On 01/07/2020 11:48, Terry Neve wrote: > 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
