279
votes
How can I reduce a video's size with ffmpeg?
You mentioned wanting to reduce the file size
to fit more videos on a mobile device, which is my use case as well.
All the answers here are for reducing the compression quality,
but nobody has ...
- 2,981
131
votes
Merge two video clips into one, placing them next to each other
To be honest, using the accepted answer resulted in a lot of dropped frames for me.
However, using the hstack filter_complex produced perfectly fluid output:
ffmpeg -i left.mp4 -i right.mp4 -...
- 1,411
129
votes
How can I reduce a video's size with ffmpeg?
I tested most of the other proposed answers to this question. The test data conclusions are below. These are the proposed answers that I tested:
(BR) Modify the bitrate, using:
ffmpeg -i $infile -b $...
- 1,429
114
votes
How can I reduce a video's size with ffmpeg?
Note that it seems that ffmpeg already performs some optimization when ran without options, so before trying to use settings you don't understand or deciding to explicitly lose information, give a try ...
- 3,483
29
votes
Accepted
How to recover a broken mp4 file: moov atom not found
You can try and use Untrunc to fix the file.
Restore a damaged (truncated) mp4, m4v, mov, 3gp video. Provided you
have a similar not broken video.
you may need to compile it from source, but there ...
- 3,991
28
votes
Accepted
Multiple /dev/video for one physical device
The second device provides metadata about the video data from the first device. The new devices were introduced by this patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/...
- 398
23
votes
How can I reduce a video's size with ffmpeg?
I compressed a 40-minute HD video presentation from 505MB to 183MB
That's like going from 100MB → 36MB.
Original video was HD and output was almost zero noticeable difference.
It's a video file "...
- 331
22
votes
How do I watch my webcam's feed on Linux?
ffplay /dev/video0 is one of the simpler methods, and will work provided you have ffmpeg installed.
To install, use sudo apt install ffmpeg.
- 221
19
votes
How can I change my webcam's power line frequency setting?
On the command line, you can set the uvcvideo driver's power line frequency setting to the 50 Hz value with:
v4l2-ctl --set-ctrl=power_line_frequency=1
If your webcam is not /dev/video0, add a -d /...
- 114k
17
votes
Accepted
How to reduce the size of a video to a target size?
@philip-couling's answer is close but missing several pieces:
The desired size in MB needs to be multiplied by 8 to get bit rate
For bit rates, 1Mb/s = 1000 kb/s = 1000000 b/s; the multipliers aren't ...
- 438
16
votes
Re-encoding video library in x265 (HEVC) with no quality loss
I've recently gone through the trouble of Transcoding my whole video catalog over to HEVC. I use https://github.com/FallingSnow/h265ize with the following settings.
h265ize -v -m medium -q 20 -x --no-...
15
votes
How to do I convert an animated gif to an mp4 or mv4 on the command line?
A side note: the important thing is to specify -pix_fmt yuv420p lest your video might seem a black rectangle in various tools:
$ ffmpeg -i animated.gif -pix_fmt yuv420p output.mp4
References
Why won'...
- 259
14
votes
How can you download 4k youtube videos in mp4 using youtube-dl?
You can find the available mp4 resolutions available for a video with:
youtube-dl --list-formats https://youtu.be/LXb3EKWsInQ | grep mp4
... 401 mp4 3840x2160 2160p60 18167k , av01.0....
- 387
13
votes
Accepted
How to restart a failed amdgpu kernel module
As @Chris Stryczynski says, sudo cat /sys/kernel/debug/dri/N/amdgpu_gpu_recover is the correct way to reload the amdgpu kernel module, or you can start your system with amdgpu.gpu_recovery=1 kernel ...
- 246
12
votes
How to significantly lower a video file size with ffmpeg without quality loss?
I had a pretty good experience with the h265 codec.
The output videos were between 2-8x smaller in size, without any noticeable loss in quality.
ffmpeg -i input.mkv -c:v libx265 -vtag hvc1 -c:a copy ...
- 1,484
11
votes
11
votes
How to do I convert an animated gif to an mp4 or mv4 on the command line?
If you want to make the output in "n loops", look at this solution in one shot
So, let's convert a normal.gif to loop.mp4
for 2 loops movie example:
ffmpeg -stream_loop 2 -i normal.gif loop.gif -y;...
- 221
11
votes
How to recover a broken mp4 file: moov atom not found
Solution provided here (https://github.com/ponchio/untrunc) solved my problem!
I run it as a Docker container. Here my steps:
Install Docker (in case you don't have it yet)
Clone the repository:
...
11
votes
How can I watch an encrypted Blu-ray on a Linux desktop?
There is no official commercial Blu-ray player for Linux.
Linux users have to use open-source libraries capable of handling the DRM schemes that protect these disc contents. This is legal in most ...
- 802
10
votes
How can I download a video from an M3U8 file?
The movie can be easily downloaded using the FFmpeg command line tool:
ffmpeg -protocol_whitelist file,http,https,tcp,tls,crypto -i my_movie.m3u8 -c copy my_movie.ts
Note that if the .m3u8 file was ...
- 293
10
votes
How can I watch an encrypted Blu-ray on a Linux desktop?
I've been working with MakeMKV beta, which is a commercial (beta: shareware) converter that can play DVDs and Blu-ray discs or save them to the hard disk. It is also possible to convert existing .iso ...
- 508
10
votes
I want to write a script that simultaneously renders what's on my webcam to a window on my screen and records a video
You're 90% there. Instead of trying to read the same camera device (virtual or not), simply add another output to your first ffmpeg invocation.
Ffmeg's options are generally in the format:
ffmpeg {...
- 51.2k
9
votes
Fast tool to generate thumbnail video galleries for command line
This tool helped me (2019-02) - and it is maintained. Many options - grid, quality, fonts, colors, border, interval, ...
https://github.com/amietn/vcsi
Create video contact sheets. A video contact ...
- 191
9
votes
Multiple /dev/video for one physical device
Really annoying, but just found a solution: let udev assign symlinks for device nodes just for the "real" cams, not the metadata. They are identical (?) to udev, i.e.
udevadm info -n /dev/video0 is ...
- 91
9
votes
Accepted
Why can multiple consumers access a *single* v4l2-loopback stream from a webcam
It's by design. First, let it be said that multiple processes can open the /dev/video0 device, but only one of them will be able to issue certain controls (ioctl()) until streaming starts.
Those V4L2 ...
- 14.2k
9
votes
Accepted
How to extract every 10th frame from a video?
If you want 1/10 of what you have now (when you use -r 1) then use
-r 0.1
It will get 1 frame every 10 seconds instead of 1 frame every 1 second.
ffmpeg -i out1.avi -r 0.1 -f image2 image-%3d.jpeg
...
- 256
8
votes
8
votes
Merge two video clips into one, placing them next to each other
ffmpeg -y -ss 0 -t 5 -i inputVideo1.mp4
-ss 0 -t 5 -i inputVideo2.mp4
-i BgPaddingImage.jpg
-filter_complex "nullsrc=size=720*720[base];[base][2:v]overlay=1,format=yuv420p[base1];[0:v]...
- 187
8
votes
Is there any video player which can seek with thumbnail like in YouTube?
Ipor Sircer's answer is sufficient and perfect but let me write a step by step answer for beginners.
Install mpv. In Ubuntu, you can execute this command.
sudo apt update && sudo apt install ...
- 998
7
votes
Can I pipe /dev/video over ssh
The accepted answer does not work for me. dd simply won't read it. nc is bad if you cant spare another port (I didn't get that to work at all either anyway). cat didn't work for me either.
What ended ...
- 2,164
Only top scored, non community-wiki answers of a minimum length are eligible