![ffmpeg concat demuxer duration ffmpeg concat demuxer duration](https://img2020.cnblogs.com/blog/980037/202012/980037-20201220212015486-1914696312.png)
Next, we label the streams of data created by the filter using the bracket syntax: V=1 indicates each input source has only one video stream and to write only one video stream out as outputĪ=1 indicates each input source has only one audio stream and to write only one audio stream out as output
![ffmpeg concat demuxer duration ffmpeg concat demuxer duration](https://i.stack.imgur.com/Acvsk.png)
N=2 is specifying there are two input sources Now after we declared what streams we are using, we have a normal filter syntax: Those of us with experience in programming will understand why the index starts at 0 and not 1 Use the video stream of the first input source, use the audio stream from the first input source, use the video stream from the second input source, and use the audio stream from the second input source. Unlike using filters normally with ffmpeg using -vf or -af, when using a complex filtergraph, we have to tell ffmpeg what streams of data we are operating on per filter. This one is probably pretty confusing, so let me explain the complex filtergraph syntax: Lets look at the examples, first the concat demuxer approach:Įnter fullscreen mode Exit fullscreen mode
![ffmpeg concat demuxer duration ffmpeg concat demuxer duration](https://i.stack.imgur.com/tJ5bN.png)
![ffmpeg concat demuxer duration ffmpeg concat demuxer duration](https://i.stack.imgur.com/ufCWE.png)
There are three methods I have found thus far: It turns out, that is rather simple to do with ffmpeg. Video:0kB audio:290436kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002787% As you can see, the output file just has the duration 00:41:51.99, but the actual file only has duration 5:11, which is the same duration of 1st file in the list.I have found it very useful to concatenate multiple video files together after working on them separately. Input #0, concat, from 'D:\exported\list.txt': * configuration: -enable-gpl -enable-version3 -enable-static -disable-w32threads -disable-autodetect -enable-fontconfig -enable-iconv -enable-gnutls -enable-libxml2 -enable-gmp -enable-lzma -enable-libsnappy -enable-zlib -enable-librist -enable-libsrt -enable-libssh -enable-libzmq -enable-avisynth -enable-libbluray -enable-libcaca -enable-sdl2 -enable-libdav1d -enable-libzvbi -enable-librav1e -enable-libsvtav1 -enable-libwebp -enable-libx264 -enable-libx265 -enable-libxvid -enable-libaom -enable-libopenjpeg -enable-libvpx -enable-libass -enable-frei0r -enable-libfreetype -enable-libfribidi -enable-libvidstab -enable-libvmaf -enable-libzimg -enable-amf -enable-cuda-llvm -enable-cuvid -enable-ffnvcodec -enable-nvdec -enable-nvenc -enable-d3d11va -enable-dxva2 -enable-libmfx -enable-libglslang -enable-vulkan -enable-opencl -enable-libcdio -enable-libgme -enable-libmodplug -enable-libopenmpt -enable-libopencore-amrwb -enable-libmp3lame -enable-libshine -enable-libtheora -enable-libtwolame -enable-libvo-amrwbenc -enable-libilbc -enable-libgsm -enable-libopencore-amrnb -enable-libopus -enable-libspeex -enable-libvorbis -enable-ladspa -enable-libbs2b -enable-libflite -enable-libmysofa -enable-librubberband -enable-libsoxr -enable-chromaprint * built with gcc 10.2.0 (Rev6, Built by MSYS2 project) Code: ffmpeg -f concat -i D:\exported\list.txt -c copy out.flacįfmpeg version 4.4-full_build-Copyright (c) 2000-2021 the FFmpeg developers