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@@ -21,4 +21,31 @@ Using CUDA:
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```
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ffmpeg -y -fflags +genpts -r 30 -hwaccel cuda -hwaccel_output_format cuda -pattern_type glob -i '*.png' -vf "setpts=100*PTS,minterpolate=fps=24:scd=none" -pix_fmt yuv420p -c:v h264_nvenc "test01.mp4"
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-```
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+```
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+
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+### Add silent audio track to a video (with no audio tack)
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+
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+```
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+ffmpeg -i "test.mp4" -f lavfi -i anullsrc=cl=stereo:r=48000 -shortest -y "test_silent.mp4"
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+```
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+Useful if you want to merge more than one \*.mp4 video and some of these ave no audio track
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+Make sure that audio rate for the silent track matches the one of file(s) you are going to merge with it
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+
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+
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+### Crop a video to a well defined size
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+
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+```
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+ffmpeg -i test_silent.mp4 -filter:v "crop=512:512:1200:200" -c:a copy te.mp4
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+```
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+Crop to size 512x512 starting from 1200,200 where 0,0 is the top left corner
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+
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+### Concatenation of two videos
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+Once you've performed tthe two steps above (same size and a silent audio if needed):
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+
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+```
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+ffmpeg -i te.mp4 -i 20231104021840.mp4 -filter_complex "[0:v][0:a][1:v][1:a]concat=n=2:v=1:a=1" -vsync vfr output.mp4
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+```
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+
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+
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