48
votes
Accepted
How to deinterlacing with ffmpeg?
Add the yadif filter i.e.
ffmpeg -i input.vob -vf yadif -c:v libx264 -preset slow -crf 19 -c:a aac -b:a 256k output.mp4
See yadif docs for more info.
- 31.8k
9
votes
Accepted
What is the ffmpeg filter equivalent of "Automatic levels" for colors?
Here's the details on what the presets do:
[PRESET_COLOR_NEGATIVE] = {
"0/1 0.129/1 0.466/0.498 0.725/0 1/0",
"0/1 0.109/1 0.301/0.498 0.517/0 1/0",
"0/1 0.098/1 0.235/0.498 0.423/0 1/0",
...
- 31.8k
8
votes
Accepted
Correct "stripes" in VHS record
Those are interlacing artifacts. They become visible when the motion in the video is faster than the field rate, so that when both fields are combined into a progressive scan image, the movement is ...
- 2,405
6
votes
How to set pts time format when using ffmpeg filter to add timestamp
Do
In order to draw Timestamp: 01:25., you should specify this one to (feed) ffmpeg:
drawtext = text = 'Timestamp\: %{pts\:gmtime\:0\:%M\\\:%S}.'
Don't
If you specify this one to (feed) ffmpeg:
...
- 161
6
votes
Removing / Overlaying logo on mp4 video format with ffmpeg on linux
Your command is missing double quotes around the filter definition :
ffmpeg -i input.mp4 -vf "delogo=x=270:y=190:w=40:h=40" -c:a copy output.mp4
(as explained in FFmpeg filters documentation)
...
- 470
5
votes
Accepted
replace black frames with previous frames
It's possible to have the black frames removed and earlier frames duplicated.
ffmpeg -i in.mp4 -vf blackframe=0,metadata=select:key=lavfi.blackframe.pblack:value=50:function=less -vsync cfr -c:a copy ...
- 31.8k
4
votes
FFMPEG: Why does the concat filter cause loss of a/v sync/lipsync?
Split using -f segment -segment_time 10 and end with 360a-a%03d.mp4. Then create a text file with one entry on each line like file '360a-a001.mp4, interleaving the entries in the correct order. Then ...
- 31.8k
4
votes
Accepted
mplayer/ffmpeg How to set caca filter's output size
Found. Caca library is driven mostly by environment variables rather than filter params.
export CACA_GEOMETRY=200x78
mplayer -vo caca $INPUT
- 219
4
votes
Accepted
ffmpeg: can I crop using vf while also using filter_complex at the same time?
Use this:
ffmpeg -i input.mp4 -filter_complex \
"[0:v]crop='if(gte(iw,ih),ih,iw):if(gte(ih,iw),iw,ih)',scale=720x720,split=3[1v][2v][3v]; \
[1v]trim=0:4.95,setpts=PTS-STARTPTS[v1]; \
[2v]trim=4.95:...
- 31.8k
3
votes
Accepted
How to improve quality of a WebCam video?
More Light
You're seeing noise for two reasons. One is the tiny sensor of your webcam, but since you don't want to buy a new one right now, you can't do anything about that. However, the sensor size ...
- 5,392
3
votes
Accepted
How to concatenate multiple videos with fades (from- and to-black) in-between?
So here is what I came up with.
A not fully one-liner solution
1) Generate black clips
ffmpeg -f lavfi -i "color=black:s=1920x1080:r=30" \
-f lavfi -i "anullsrc=r=48000:cl=stereo" ...
- 81
3
votes
Accepted
How to set pts time format when using ffmpeg filter to add timestamp
Use
text='timestamp \: %{pts\:gmtime\:0\:%H\\\:%M\\\:%S}'
- 31.8k
3
votes
Accepted
Add semi-transparent box around subtitle
Use
ffmpeg -i movie.mkv -strict -2 -vf "subtitles=subtitle.srt:force_style='FontName=ubuntu,fontsize=30,BorderStyle=3,OutlineColour=&H80000000',scale=720:-1" -qscale:v 3 Movie.avi
See Style ...
- 31.8k
3
votes
"ffmpeg" set fontsize and font
I did solved this with " "
"subtitles=subtitle.srt:force_style='FontName=ubuntu,Fontsize=30'"
- 235
3
votes
ffmpeg concat with or without audio
Use the concat demuxer instead:
Create a text file of the following format
file 'C:\source.mp4'
inpoint 0
duration 1
file 'C:\source.mp4'
inpoint 3
duration 1
file 'C:\source.mp4'
inpoint 6
duration ...
- 31.8k
3
votes
Accepted
FFmpeg: afade plugin, how to specify time 1:55 if colon separates filter parameters? Escape
Enclose the time argument in single quotes and escape the colons within.
So,
afade=t=out:curve=hsin:st='00\:0\:30':d='00\:00\:10'
- 31.8k
3
votes
Add noise to video while maintaining compressibility
As you say, noise by definition doesn't compress well. You can try different types of noise in FCP. The Add Noise filter has several choices - Gaussian is a reasonable simulation of film grain, but ...
- 2,146
3
votes
Accepted
FFMPEG duplicates the first frame when encoding
You can skip that first frame during the computation process.
ffmpeg -y -i "720p50_mobcal_ter.avi" -i "720p50_mobcal_ter.mpg" -filter_complex "[1:v]trim=start_frame=1,setpts=PTS-STARTPTS[cut];[0:v][...
- 31.8k
3
votes
Accepted
Color leakage effects with ffmpeg blend=all_expr
The default pixel format for testsrc filter is rgb24, which gets converted to yuv444p for encoding to H264. The default pixel format for color is yuv420p, which is kept as-is.
The blend filter ...
- 31.8k
2
votes
Accepted
Accurate audio selection
This command, which used t reference for aselect, worked for me:
ffmpeg -i AV36_1.avi -vf "select=between(n\,200\,399),setpts=PTS-STARTPTS" -af "aselect=between(t\,(200/15)\,(399/15)),asetpts=PTS-...
- 31.8k
2
votes
Accepted
Stack images with "hstack"-filter from video or image sequence in ffmpeg
You're better off using the tile filter for this:
ffmpeg -i INPUT.mov -vf fps=1,scale=192:108,tile=54x1 output.jpg
The tile argument is the size of a rectangle. So for a 54 second video, 54x1 ...
- 31.8k
2
votes
What -preset medium stand for in ffmpeg
On the page you linked to it explains it fairly well:
A preset is a collection of options that will provide a certain encoding speed to compression ratio. A slower preset will provide better ...
- 13.6k
2
votes
Accepted
What -preset medium stand for in ffmpeg
preset is a private option that may be defined for an encoder, such as libx264. It is a shorthand method to set a whole bunch of options at once, and won't have any effect if set when using an encoder ...
- 31.8k
2
votes
Accepted
ffmpeg fade to specific color values over time
The lut filter expressions don't work with time. geq does.
geq=r='(1-0.7*min((T-S)/D,1))*p(X,Y)':g={the same as r}:b={the same}:enable='gte(t,S)'
S should be your start time in second. D is duration ...
- 31.8k
2
votes
If I use a normal build of ffmpeg how take advantage of video acceleration for scale?
The answer to your second question is yes. Change -c:v libx264 to -c:v h264_nvenc. I use those builds as well. If you use the option -encoders you can see a list of included video and audio codecs.
...
- 106
2
votes
Accepted
Replace all completely black frames with interpolated frames
After poring over the documentation all weekend, I figured out how to use the minterpolate filter to do motion interpolation. The full command is
ffmpeg -i in.mp4 -vf blackframe=0,metadata=select:...
2
votes
Accepted
Combine -vf yadif,format=yuv420p and -filter_complex for watermark
Use
ffmpeg -i input.mp4 -i logo.png \
-filter_complex "[0]yadif,format=yuv420p[main];[1][main]scale2ref=iw/5:ow*450/450[wm][vid];[vid][wm]overlay=W-w-W*3/100:H-h-H*1/100:enable='gt(t,30)'" \
-...
- 31.8k
1
vote
How to use ffmpeg to fade in/out a veriable frame rate video clip with unknown duration
This works here
ffmpeg -i VID_1.mp4 -sseof -2 -copyts -i VID_1.mp4 -lavfi "[1]fade=out:s=1:d=2[tail];[0][tail]overlay,fade=in:s=0:d=2,scale=640:-2[video];anullsrc,atrim=0:2.1[audiotail];[0][audiotail]...
- 31.8k
1
vote
Accepted
ffmpeg error "Error initializing complex filters"
Font paths have to be escaped:
fontfile='c\:\\Windows\\Fonts\\simsun.ttc'
- 31.8k
Only top scored, non community-wiki answers of a minimum length are eligible