Questions tagged [video]

Video is the technology of electronically manipulating still images that represent motion.

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250
votes
1answer
323k views

How can I crop a video with ffmpeg?

I have an MP4 file of a screen recording that I need to crop down. How can I accomplish this without using expensive tools like Adobe Premier or Final Cut? I prefer ffmpeg because I have used it ...
53
votes
12answers
5k views

Good open source Video Editors?

Sure, I could Google and find random software. But I rather have the opinion of users that have had hands-on with any open source video editors. So if you've used one that you like or know of any, ...
44
votes
2answers
98k views

Add an image overlay in front of video using ffmpeg

I have many videos and I need to put an image in front of them for about 5 seconds, but adding it manually and rendering it each time would take really long, so I am asking if it is possible to do so ...
36
votes
7answers
42k views

How do I turn audio into video (that is, show the waveforms in a video)?

I have to create a video. Part of it involves "showing" a radio interview. Rather than just having a black screen and listening to the audio, I'd like to have a varying waveform on the screen and a ...
29
votes
4answers
41k views

How does YouTube encode my uploads and what codec should I use to upload?

Related to What codecs/formats are appropriate for full motion video recording for youtube? I'm wondering exactly how I can expect Youtube to handle my videos. I know they have a rather zealous ...
25
votes
3answers
36k views

How to fade in/out a video/audio clip with unknown duration?

I'm working on a project where I'm using ffmpeg to batch convert some video files, and adding fade in/out effects at the head and tail of each clip. I've been using this bit of code to add the fade/...
24
votes
4answers
71k views

How to losslessly encode a jpg image sequence to a video in ffmpeg?

I have a large set of jpgs that I want to convert to a video losslessly (or, at the very least, very close to losslessly as long as the encoding time isn't much higher than otherwise). Naively, I ...
24
votes
5answers
51k views

Non-Monotonous DTS on concat (ffmpeg)

After running this command ffmpeg -f concat -i mylist.txt -c copy output.mp4 - I'm getting corrupted output.mp4 file and this message: ffmpeg -f concat -i mylist.txt -c copy output.mp4 ffmpeg version ...
19
votes
4answers
20k views

Render srt subtitles to video?

I have subtitles in .srt file format, and I need to render them on top of video file (prefereably mp4). I have tried handbrake and mediacoder so far, with no luck. What should I do?
18
votes
4answers
3k views

Why do weathermen and amateurs use green screens when professional movie makers use blue screens?

I've seen a lot of "low budget" green screen setups. However, when I watch things about professional filmmaking, it seems everyone is using blue screens instead. (e.g. I've seen Industrial Light and ...
18
votes
1answer
23k views

How to use FFmpeg Command for Reverse Video?

i am use to FFmpeg library in android for reverse video. I can dump images from video but how to reverse all images and make video. See this link that from i am use to library in my gradle.. Library ...
16
votes
3answers
58k views

Why processor is “better” for encoding than GPU?

I was reading this article and I saw that a CPU is better for video compression than a GPU. The article only says that happens because the processor can handle more complex algorithms than the GPU, ...
15
votes
7answers
72k views

Adobe Premiere Pro CC - Crop a video and export at the exact cropped size

I have a video that has 4 up-down-left-right black borders of different sizes. I want to get rid of these black borders so the exported file has the exact size of the cropped area. To do this, I ...
15
votes
2answers
25k views

Is it possible to speed up a video using handbrake?

Is it possible to speed up a video using handbrake ? I am looking for a software like handbrake to convert videos for faster playback. It should speed up the video up to 30x. Is it possible with ...
15
votes
2answers
550 views

Why filmmaking with DSLR?

Adding video feature to digital camera was for their popular applications, as unprofessional users wanted to have both photography and videography at the same time. Professional cameras were ...
14
votes
2answers
39k views

ffmpeg drawtext filter - create transparent background with text

I am currently working with the drawtext filter. So far I have only been successful with drawtext option configurations to use the right font and place the text horizontally centered. How could i get ...
14
votes
2answers
14k views

Why does all timecode start at 1 hour? (01:00:00:00)

Is there a reason timecode in Final Cut 7 and timecode in Pro Tools starts at the 1 hour mark? eg. 01:00:00:00? As opposed to all zeros? Some old broadcast standard that I don't know about?
12
votes
1answer
13k views

Can I set the start number for image sequence output?

I am using ffmpeg to convert from video to an image sequence as follows: ffmpeg -i video.webm image-%03d.png The first image is labelled 001, but I want it to be labelled 098. Is it possible to set ...
12
votes
5answers
157k views

How can I merge/link two video clips in Premiere?

Every time I search this problem in Google the only options are how to link audio clips to video or how to sync audio to video clips. I need to combine/link/merge a picture to a video clip, so that ...
12
votes
5answers
22k views

Convert a 60 fps video to a 24 (film) video - is it possible?

This may not be as simple a problem as it may seem at first, so read carefully. When I set my (Canon 60D, but this doesn't really matter at all) camera to record at 24 fps (I think it's actually 23....
11
votes
6answers
10k views

Is there a video type for vector animation?

Is there a vector-based video type, preferably open-source, so that an animated clip could be produced using "rules" instead of pixel-compression? This would mean lossless resolution-independent ...
11
votes
4answers
2k views

Is there a rule of thumb for transitions in video production?

I'm a software engineer but as the junior member on the team I was tasked with making a looping demo for our product that will be played continuously at an upcoming convention. The video is not only ...
11
votes
1answer
2k views

Is it possible in FFMPEG to change scale over time?

Ok, so using the overlay filter, one can change the x/y location of a video over time by using the "t" variable. For example, overlay=x='if(gte(t,2), -w+(t-2)*20, NAN)':y=0 can be used to ...
10
votes
2answers
9k views

What is KeyInt and min-keyint and no-scenecut

I am absolutely new to video processing, I am building a video streaming site and worked with ffmpeg to generate the formats I need for ShakaPackager. Sadly I don't understand some of the options ...
10
votes
6answers
48k views

How to reduce wind noise from a video?

I am using a Canon EOS-650D to record video and I have a problem with wind/noise on my recordings. Can anyone tell me how can I reduce noise/wind from the recorded video. I usually edit my videos on ...
10
votes
4answers
966 views

How do I get a totally white background without the subject being too bright?

I would like to do a product demonstration similar to the White Room's demonstrations done by Apple, such as iPad 2 Product Demonstration What type of lighting is used to keep the whites extremely ...
10
votes
1answer
13k views

Video converted by FFMPEG has a different duration, why?

I convert videos using FFMPEG. My goal is to convert them to the MP4 container format (MPEG-4 Part 14) with AAC-encoded audio stream and MPEG-4 part 10-encoded video stream. I use the following line ...
10
votes
4answers
7k views

Cheap solution for shooting with multiple (>2) cameras in sync (genlock or LANC?)

I'm doing research into natural phenomena in computer vision, and I'm looking for a method of shooting video from multiple camera angles. It's likely that the subject will move very erratically, ...
9
votes
5answers
1k views

What is the difference between an amateur and a professional camcorder?

It is known that professional photographers use SLRs & regular users use point & shoot camera. What kind of cameras do professional videographers use & whats the difference?
9
votes
3answers
4k views

Best way to batch rotate 3000+ h.264 videos?

I have approximately 3000 short video clips, each about 3 seconds in duration. I need to rotate each of them 90 degrees. What is the best way to do this? I have Adobe Creative Cloud subscription, as ...
9
votes
3answers
10k views

Corrupt MP4 [recording interrupted]

I was recording an MP4 file using PlaysTV, and my computer had a power fault half-way through the recording. I'm sure that the file contains valid data, it's just that no media player will recognize ...
9
votes
2answers
7k views

The ProRes of Premiere Pro?

I'm going to be editing more and more DSLR videos, most notably music videos for my band as we start releasing singles and want to know if there is an intermediate format for both cutting and ...
9
votes
2answers
9k views

Does raising the framerate while not changing the bitrate result in quality loss?

AFAIK, the bitrate is the number of bits per second. So let's say I have two videos, both using the same codec, bitrate settings and resolution. If the first one has a framerate of 25fps, but the ...
9
votes
6answers
101k views

Adobe Premiere preview video lagging

I am attempting to edit video in Adobe Premiere CS6. When I create a sequence and try to play it back in the preview screen, the video is extremely choppy, which makes editing very difficult (dance ...
9
votes
3answers
6k views

Best Lossless Video Encoder For Editing

I'm looking for a good video encoder to compress HD files for editing within Sony Vegas Pro and Adobe After Effects. What video codec would provide the fastest possible encoding and decoding? Also, ...
8
votes
7answers
13k views

Video with person 'writing on glass' effect

I'm trying to find someone who can make videos similar to one shown here: At 49 seconds, the actress writes on glass to explain the concept. ...
8
votes
5answers
21k views

How can I find duplicate videos from a large set of videos of varying formats?

After losing a backup device with a bunch of my original videos I've had to download a large number of them (~300) back from Youtube. The new downloads are a mix of MP4 and FLV, and the originals are ...
8
votes
3answers
10k views

how to blur a short scene in a video

I need a software which can blur a scene from a video file. I have thought about VirtualDub and Adobe Premiere but I am not sure if they provide the desired functionality. My requirement is to blur a ...
8
votes
6answers
14k views

Adding a time stamp to a video

Anyone know of a program that will add a visible date and time stamp to a video file? Preferably, I can just put in the start time of the video and it will just keep incrementing the time as the video ...
8
votes
2answers
2k views

Is there any format for videos like RAW format for photos?

Like the RAW format for photos which stores the exact image information that is of great use for post processing, are there any similar formats for video?
8
votes
3answers
312 views

Good learning resources for 'non-technical' aspects of filmmaking

I am a relative newcomer to video production but have a background in still photography. This means that I have a good understanding of things like ISO/aperture/shutter speeds/resolution/etc. (and ...
8
votes
1answer
2k views

What codecs/formats are appropriate for full motion video recording for youtube?

I'm recording video game footage via lossless methods, after which I need to compress them and upload them to youtube. I'm not sure which format and/or codecs are best for this. I've been ...
8
votes
4answers
28k views

Creating a split screen video of a multitrack recording

It's fairly common to see videos in which, to accompany a piece of music created using overdubs, we see a split screen showing the artist performing each overdub. What functions, in which software, ...
8
votes
1answer
2k views

Batch resize videos with “pan and scan” cropping

I am trying to prepare a collection of ~120 video clips to be played in VLC Player and projected on a low-res (1024x768) projector during a DIY electronic music event. The source clips are all super ...
8
votes
2answers
30k views

8bit vs 10bit vs 12bit

I do a lot of HEVC encoding and what I've read is 10bit is always better than 8bit, even from an 8bit source, because it avoids rounding errors. Is that true? Also, then is 12bit better than 10bit or ...
8
votes
0answers
3k views

Using ffmpeg to cut videos with more precision than key frames allow

I'm trying to cut a video (a debate on TV) with FFmpeg without re-encoding, and I need to cut between 2 sentences a guy pronounce. I think the precise moment is between two keyframes, because whatever ...
7
votes
3answers
112 views

Does a real “megapixel lens” exist?

Many of new model of lenses are defined as megapixel (i.e 1MP, 2MP, 5MP...). My problem is that I did not find any difference between a standard lens and a "megapixel" one, in the focus quality. I ...
7
votes
9answers
228 views

Places to look for sound tracks for videos

I'm wondering what's a good place to look for background music for our video productions. I'm not asking for a free one, but for any good place with a good categorization of soundtracks and songs for ...
7
votes
5answers
3k views

How to connect a camera to a computer 100ft away?

We are trying to live stream our worship service on Sunday morning. We have located an ideal spot for the video camera. Unfortunately it is 100 ft away from the sound and network connections which ...
7
votes
6answers
7k views

Screen refresh rate above 100 Hz noticeable?

Is a refresh rate higher than 100 Hz still noticeable for the human eye? Tv manufacturers are still taking these refresh rates to new heights, but is there really a noticeable difference between a ...

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