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01_ffmpeg
ffmpeg -hide_banner -loglevel warning -i input.webm \
-c:a aac -b:a 128k \
-c:v libx264 -b:v 1000k \
-s 1920x1080 -r 25 output.mp4
ffmpeg -i 1.mp4 -c copy -an out.mp4
ffmpeg -i 1.mp4 -vn out.mp3
speed up video only:
ffmpeg -i 1.mp4 -vf "setpts=PTS/10" output.mp4
speed up audio only:
ffmpeg -i input.mp4 -af "atempo=1.1" out.mp4
you can use both flags together
ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4
content of list .txt:
file '/home/davood/Desktop/video/out.mp4'
file '/home/davood/Desktop/video/out2.mp4'
ffmpeg -hide_banner ...
ffmpeg -c:a copy ...
ffmpeg -c:v copy ...
ffmpeg -i input.mp4 -c:v copy -c:a libfdk_aac -b:a 128k output.mp4
it might not work in windows, so use built-in AAC:
... -c:a aac ...
ffmpeg -i input -c:v libx264 -c:a copy output.mp4
Windows users should use NUL instead of /dev/null and ^ (in command prompt) or ` (in PowerShell) instead of .
ffmpeg -y -i input -c:v libx264 -b:v 2600k -pass 1 -an -f null /dev/null && \
ffmpeg -i input -c:v libx264 -b:v 2600k -pass 2 -c:a aac -b:a 128k output.mp4
ffmpeg -i input.mp4 -s 1920x1080 output.mp4
ffmpeg -i input.mp4 -r 25 output.mp4
ffmpeg -i in.mov -vf "transpose=1" out.mov
0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip
//// with start and stop time:
ffmpeg -i input.mp4 -ss 00:01:00 -to 00:02:05 output.mp4
//// with start and duration(in seconds):
ffmpeg -i input.mp4 -ss 00:01:00 -t 100 output.mp4
//// from second 3 to end:
ffmpeg -i input.mp4 -ss 3 -c copy output.mp4
... -preset ultrafast ...
... -preset veryslow ...
greater numbers lead to less quality and size (constant rate factor):
... -crf 23 ...
... -qp 0 ...
to use 2 cores:
- threads 2
ffmpeg -loglevel <LEVEL>
defaul level is warning. available log levels, from less info to more info:
quiet
panic
fatal
error
warning
info
verbose
debug
ffmpeg -framerate 10 -pattern_type glob -i '*.png' -c:v libx264 -pix_fmt yuv420p output.mp4
ffmpeg -i input.png output.jpg
changing quality:
-q:v 2
: sets the quality of the output JPEG. The value can range from 2 to 31, where 2 is the highest quality and 31 is the lowest.
ffmpeg -i input.png -q:v 2 output.jpg
Using percentage based compression
ffmpeg -i input.png -compression_level 100 output.jpg
changing size:
ffmpeg -i input.png -vf "scale=iw*0.5:ih*0.5" output.jpg
when using cuda, setting the framerate (and a little, the bitrates) has critical effect on convert speed
without
-hwaccel cuda
it totally uses CPU. with-hwaccel cuda
, it uses both GPU and CPU. if you use-hwaccel_output_format cuda -c:v h264_nvenc
as well, it totally uses GPU.
use cuda:
ffmpeg -hwaccel cuda ...
if it doesn't use 100% GPU, you need to compile ffmpeg yourself:
mkdir ~/nvidia/ && cd ~/nvidia/
git clone https://git.videolan.org/git/ffmpeg/nv-codec-headers.git
cd nv-codec-headers && sudo make install
cd ~/nvidia/
git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg/
sudo apt install build-essential yasm cmake libtool libc6 libc6-dev unzip wget libnuma1 libnuma-dev
cd ~/nvidia/ffmpeg/
./configure --enable-nonfree --enable-cuda-nvcc --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --disable-static --enable-shared
make -j $(nproc)
sudo make install
verify installation:
ls -l /usr/local/bin/ffmpeg
type -a ffmpeg
ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -c:v h264_nvenc -r 25 output1.mp4
if cannot find some shared objects, first find them and then make a symlink for them(in this case the lib is in /usr/lib/libavdevice.so.61
but the system cannot find it):
sudo ln -s /usr/lib/libavdevice.so.61 /usr/lib/x86_64-linux-gnu/libavdevice.so.61
reference on presets and encoding
#!/bin/bash
# Define input folder, output folder, and watermark text
input_folder="input_videos"
output_folder="output_videos"
watermark_text="Your Watermark Text"
### Create the output folder if it doesn't exist
mkdir -p "$output_folder"
### Loop through all video files in the input folder
for video in "$input_folder"/*; do
# Get the filename without extension
filename=$(basename "$video")
output="$output_folder/$filename"
# Add text watermark using FFmpeg
ffmpeg -i "$video" -vf "drawtext=text='$watermark_text':fontcolor=white:fontsize=24:x=10:y=10" -c:v libx264 -crf 23 -preset medium -c:a copy "$output"
echo "Processed: $filename -> $output"
done
-
-vf "drawtext=...
:-
text='Your Watermark Text'
: The text to display. -
fontcolor=white
: The color of the text. You can use other colors likeblack
,red
, or hex values (#FFFFFF
). -
fontsize=24
: The size of the text. -
x=10:y=10
: The position of the text.- Top-left:
x=10:y=10
- Top-right:
x=w-tw-10:y=10
- Bottom-left:
x=10:y=h-th-10
- Bottom-right:
x=w-tw-10:y=h-th-10
-
w
: Video width. -
h
: Video height. -
tw
: Text width. -
th
: Text height.
-
- Top-left:
-
-
-c:v libx264
: Specifies the H.264 video codec. -
-crf 23
: Sets video quality (lower is better). -
-preset medium
: Balances encoding speed and compression. -
-c:a copy
: Copies the audio without re-encoding.
If you want to use a specific font:
- Install the font:
Replace
sudo apt-get install fonts-dejavu-core
fonts-dejavu-core
with the desired font package. - Modify the command to specify the font:
-vf "drawtext=text='Your Watermark Text':fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf:fontcolor=white:fontsize=24:x=10:y=10"