2
votes
Accepted
ffmpeg - how do i crop different values from top and bottom
After two days of looking for an answer to this question, I found out the logic behind it and I'll share it here, because this topic looks as the best place for it, I hope it helps people understand ...
- 36
2
votes
Programmatically detect 'packed B-frames' AVI files
I wanted to avoid grepping ffmpeg's warnings from stdout/stderr in my own tools, so I looked for an alternative/stabler approach. The key to how ffmpeg detects packed B-frames is here:
https://github....
2
votes
Meaning of ffmpeg output (tbc, tbn, tbr)
abbrev
full
variable
explanation
fps
frames per second
AVStream.avg_frame_rate
average frame rate = total frames / total seconds. A variable frame rate video may have an fps of 57.16
tbr
time base, ...
- 131
2
votes
Accepted
How to re-encode leaving only every Nth frame in?
See FFmpeg documentation regarding select filter https://ffmpeg.org/ffmpeg-filters.html#Examples-160, so to keep every 60th frame use -vf "select=not(mod(n\,60))"
And this has been already ...
- 76
2
votes
Accepted
Why does ffmpeg flip upside-down the video when concatenating with -f concat?
The concat demuxer amalgamates all its inputs and presents them as a single input. It takes the properties of the first input as representing the properties of the amalgam. Since the 1st input has a ...
- 32.3k
2
votes
Accepted
ffmpeg-converted video file won't play in Windows Media Player or Movies & TV
Legacy media players like Windows Media Player may be finicky about the files they will accept. In this case, it looks like the audio channel count of 6 is too high.
Add the CLI option -ac 2 and check....
- 32.3k
2
votes
ffmpeg - inacurate overlay position
Change base video to full chroma sampling and try.
[0:v] select='between(t,1.247,2.550)+between(t,4.181,5.681)', setpts='PTS-STARTPTS-((gt(T,2.550)*1.630))/TB',format=yuv444p[v0];
and
[v0][1:v] ...
- 32.3k
2
votes
ffmpeg, first second of cut video part freezed
What works for me was:
ffmpeg -ss 00:01:00 -i video.mp4 -to 00:02:00 -c:v libx264 -c:a aac cut.mp4
- 21
2
votes
ffmpeg one draw text to multiple outputs
You need to split the drawtext output and then map a split result for each output.
ffmpeg \
-i ./source/video/women/1.mp4 \
-i ./source/audio/women.mp3 -y \
-filter_complex drawtext=fontsize=80:...
- 32.3k
1
vote
How to hold the last frame when using ffmpeg
This solution is much faster because it does not require re-encoding.
If there already is an existing audio stream:
ffmpeg -i in.mp4 -vcodec copy -af apad -t 60 out.mp4
If there is NO existing audio ...
- 131
1
vote
Unable to find a suitable output format for 'libfdk_aac' libfdk_aac: Invalid argument
The error is happening because the -x265-params option is missing the required parameter. Instead of a real parameter to pass to libx265, it is swallowing the audio codec option. See Passing Options ...
- 111
1
vote
Accepted
Lossless masking of MP4/h.264
The short answer is no.
You can use the drawbox filter to overlay a gray or any other color box over a rectangular region of a video.
However, it then has to be re-encoded. You can specify lossless ...
- 32.3k
1
vote
Codecs supporting variable resolution (y height of frame changes with time)?
create videos with different resolutions:
ffmpeg -lavfi "color=green:704x396;anullsrc" -t 1 "in-01.webm" -y
ffmpeg -lavfi "color=yellow:640x480;anullsrc" -t 1 "in-02....
- 126
1
vote
Accepted
ffmpeg how to change audio tbn
There's no such option for audio in MP4. MKV uses a fixed timescale of 1000 which is why audio has that tbn. In MP4, ffmpeg will set it to the sample rate.
The latter is precise.
Notice the timestamps ...
- 32.3k
1
vote
Accepted
Fade transition - fade vs. fadefast vs. fadeslow
They differ in rate of progression, i.e. fade is a linear progression, so that at half the duration, fade status is 50% i.e. both inputs are equally mixed. For fadefast, it starts fast and then slows ...
- 32.3k
1
vote
Can you fix videos with "error: more than 5 seconds of late video" without re-encoding with ffmpeg?
Will just note, that I experienced this on one machine's vlc; when I tried on what would be presumably the same vlc version on the same OS (Ubuntu 20.04) but on a different machine, I did not get that ...
- 121
1
vote
Accepted
ffmpeg seek position options not working with h264
.h264 is a raw format. It has no timestamps or metadata storing the input duration. Therefore you need to convert it to mp4 or another suitable format.
You can mux to MP4 and use that.
ffmpeg -i xx....
- 32.3k
1
vote
FFmpeg: maximum VHS quality?
we're recently experimenting with FFMPEG (analog) capture too, so we opened this "issue" @ github:
https://github.com/cdgriffith/FastFlix/issues/418
Feel free to join the discussion in order ...
- 36
1
vote
Accepted
ffmpeg: video size/quality changes when applying ffmpeg with no filters or other parameters
When you run ffmpeg without specifying any options, its default behavior is to decode the audio and video and then reencode them. In the case of mp4, it chooses its aac encoder for the audio, and ...
- 26
1
vote
Accepted
A video tool or ffmpeg filter to fix slightly shaky films from the 70s and 80s?
This is most often caused by interlace artifacts as televisions and video devices prior to 1998 used interlace to pass video between them. This included VCR's DVD players TV's (even HDTV's at the time)...
- 26
1
vote
Error when trying to execute ffmpeg command
This will get you one frame at the one minute mark.
ffmpeg -ss 00:01:00 -i "[FilePath]" -frames:v 1 img.png
- 121
1
vote
Is it possible to embed a thumbnail in a .mkv file?
I was also going down this rabbit hole and found that there's an option -attach filename that's more specific to mkv files. It's at the end of the "Main Options" section of the manual: https:...
- 111
1
vote
Accepted
Convert mp4 to webm in a reasonable time
First of all, consider to avoid "2-pass" if you only need to convert format.
Most of time, CRF is enough unless you have specific requirement on the output file size.
Use "CRF" to ...
- 26
1
vote
Ignore region of video for vidstabdetect
You can use a crop filter in the detect phase. I do this to ignore the date/timestamp in the bottom of my old videos. E.g. for my 1440x1080p 60fps video I use
-vf "crop=1440:750:1:1 , ...
- 11
1
vote
changing timebase of mkv file
Although the Matroska format supports up to nanosecond precision timestamps, currently ffmpeg only seems to support milisecond timestamps, which is the default value. (There is a patch to fix this, ...
- 111
1
vote
ffmpeg: Make letters appear one at the time, like a typewriter
After improving for my case what Thiago said.
I arrived to this:
First the ffmpeg code
For mp4:
ffmpeg -f lavfi -i color=c=black:s=640x480:d=8 -vf "subtitles=typewriter.ass" -...
- 111
1
vote
Widely compatible video format with lossless audio
To my knowledge, the only lossless audio format with really wide compatibility is plain old linear PCM.
As container format, MP4 is the most wide-spread.
- 111
1
vote
How can you use ffmpeg's afftdn -sn flag to sample noise from a reference noise file?
This worked beautifully, many thanks to @Gyan.
Just to add to the accepted answer, as I needed to do this for a large number of mp3 audio files with similar noise profiles and with a naming scheme of ...
1
vote
FFMPEG - convert video to Black & White with threshold?
The main answer didn't work for me, this did:
ffmpeg -i input.mkv -f lavfi -i color=gray:s=1280x720 -f lavfi -i color=black:s=1280x720 -f lavfi -i color=white:s=1280x720 -filter_complex "[0:v]...
- 111
1
vote
How do I fade in and out in FFmpeg?
As the topic asks for ffmpeg in general, an additional info to the answer of MarianD if you have only audio; there are no frames, so you have to use the start time option and for that you have to use ...
- 15
Only top scored, non community-wiki answers of a minimum length are eligible