Am 06.03.2019 um 20:17 schrieb Paul B Mahol:
On 3/6/19, Michael Koch <[email protected]> wrote:
Am 06.03.2019 um 17:12 schrieb Paul B Mahol:
On 3/6/19, Michael Koch <[email protected]> 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?
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
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