On 3/6/19, Michael Koch <astroelectro...@t-online.de> wrote: > Am 06.03.2019 um 20:17 schrieb Paul B Mahol: >> On 3/6/19, Michael Koch <astroelectro...@t-online.de> wrote: >>> Am 06.03.2019 um 17:12 schrieb Paul B Mahol: >>>> On 3/6/19, Michael Koch <astroelectro...@t-online.de> wrote: >>>>> I'd like to know which frames does the tmix filter use for averaging. >>>>> Let's assume tmix=frames=9. >>>>> To make the n_th frame of the output video, does it use input frames >>>>> n-8 >>>>> to n, or n-4 to n+4, or n to n+8? >>>>> How does the filter behave at the beginning and end of the video, where >>>>> not all required input frames exist? >>>> Filter output first frame after frames=9 it got from input. At >>>> encountering eof it simply ends. >>> I did make this test with a 5 seconds @25fps input video with >>> tmix=frames=50, so that the output should be 2 seconds shorter. But the >>> output video has the same length as the input. >> Your interpretation of test results is invalid. >> You should count frames. > > Well, I did run the video in VLC and measure the duration with a > stopwatch, and it is 5 seconds. Below is the FFprobe output. > How can I count the frames?
Old fashioned way - by hand. > > F:\Meteore>c:\ffmpeg\ffprobe F:\Meteore\test.mp4 > ffprobe version N-93219-gc679119a73 Copyright (c) 2007-2019 the FFmpeg > developer > s > built with gcc 8.2.1 (GCC) 20190212 > configuration: --enable-gpl --enable-version3 --enable-sdl2 > --enable-fontconfi > g --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d > --enable-libb > luray --enable-libfreetype --enable-libmp3lame > --enable-libopencore-amrnb --enab > le-libopencore-amrwb --enable-libopenjpeg --enable-libopus > --enable-libshine --e > nable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame > --enable > -libvpx --enable-libwavpack --enable-libwebp --enable-libx264 > --enable-libx265 - > -enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib > --enable-gmp --enab > le-libvidstab --enable-libvorbis --enable-libvo-amrwbenc > --enable-libmysofa --en > able-libspeex --enable-libxvid --enable-libaom --enable-libmfx > --enable-amf --en > able-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc > --enable-nvdec --e > nable-dxva2 --enable-avisynth --enable-libopenmpt > libavutil 56. 26.100 / 56. 26.100 > libavcodec 58. 47.102 / 58. 47.102 > libavformat 58. 26.101 / 58. 26.101 > libavdevice 58. 6.101 / 58. 6.101 > libavfilter 7. 48.100 / 7. 48.100 > libswscale 5. 4.100 / 5. 4.100 > libswresample 3. 4.100 / 3. 4.100 > libpostproc 55. 4.100 / 55. 4.100 > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'F:\Meteore\test.mp4': > Metadata: > major_brand : isom > minor_version : 512 > compatible_brands: isomiso2avc1mp41 > encoder : Lavf58.26.101 > Duration: 00:00:05.04, start: 0.000000, bitrate: 1418 kb/s > Stream #0:0(und): Video: h264 (High 4:2:2) (avc1 / 0x31637661), > yuv422p, 120 > 0x1200 [SAR 1:1 DAR 1:1], 2128 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc > (default) > > Metadata: > handler_name : VideoHandler > Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, > stereo, flt > p, 127 kb/s (default) > Metadata: > handler_name : SoundHandler > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".