[CinCV TNG] cinelerra-gg render bug or feature concerning ffmpeg vfr and cfr

Frederic Roenitz roenitz at aimvis.de
Mon Jul 10 20:17:28 CEST 2017


Sorry to announce this, but it looks like the "fps"-problem happens
when using vp8 (webm).

Same test scenario as before: start cinelerra, n, Framerate: 25fps,
select 10seconds, insert video effect: "title" with "Stamp timecode",
render with:

File Format: FFMPEG webm
unchecked: Render audio tracks
video wrench: delete all "Video Options:"


ffprobe for rendered file:

$ ffprobe bug-wrongFpsWhenRenderingToVp8.webm
ffprobe version 3.2.5-1~bpo8+1 Copyright (c) 2007-2017 the FFmpeg developers
   built with gcc 4.9.2 (Debian 4.9.2-10)
   configuration: --prefix=/usr --extra-version='1~bpo8+1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --disable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r 
--enable-libopencv --enable-libx264 --enable-shared
   libavutil      55. 34.101 / 55. 34.101
   libavcodec     57. 64.101 / 57. 64.101
   libavformat    57. 56.101 / 57. 56.101
   libavdevice    57.  1.100 / 57.  1.100
   libavfilter     6. 65.100 /  6. 65.100
   libavresample   3.  1.  0 /  3.  1.  0
   libswscale      4.  2.100 /  4.  2.100
   libswresample   2.  3.100 /  2.  3.100
   libpostproc    54.  1.100 / 54.  1.100
Input #0, matroska,webm, from 'bug-wrongFpsWhenRenderingToVp8.webm':
   Metadata:
     encoder         : Lavf57.71.100
   Duration: 00:00:09.96, start: 0.000000, bitrate: 188 kb/s
     Stream #0:0: Video: vp8, yuv420p, 1280x720, SAR 1:1 DAR 16:9, 1k fps, 25 tbr, 1k tbn, 1k tbc (default)


Kind greetings

Frederic


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