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Questions tagged [video]

Questions about video editing, streaming, conversion, capturing or video output. Use a more specific tag if possible.

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105 votes
4 answers
30k views

What is a Codec (e.g. DivX?), and how does it differ from a File Format (e.g. MPG)?

I'm so confused... what is the difference between an audio/video codec (which apparently is a shorthand for "encoder/decoder", kind of like how "modem" is really "modulator/demodulator") and an audio/...
user541686's user avatar
  • 23.7k
48 votes
2 answers
52k views

Create video with 5 images with fadeIn/out effect in ffmpeg

With 5 images I have to create a video of 60 seconds in ffmpeg, each image has to display for 15 seconds. after 15 seconds, first image has to fade out and 2nd image has to fade in, after that 2nd ...
user384847's user avatar
599 votes
9 answers
832k views

Using ffmpeg to cut up video

I am using ffmpeg to cut out a section of a large file like this: ffmpeg -i input.wmv -ss 60 -t 60 -acodec copy -vcodec copy output.wmv The -ss part works fine but the -t is ignored. It correctly ...
Neil's user avatar
  • 6,119
23 votes
14 answers
79k views

Use Flash Player after 12 Jan 2021

I would like to use Flash Player to show web contents but since today (12 Jan 2021) Adobe is blocking it. Is there a way to use it? I've tried Firefox, Chrome, Safari and Brave browsers.
Tenaciousd93's user avatar
45 votes
7 answers
65k views

crossfade between 2 videos using ffmpeg

I've been trying to achieve a crossfade transition between 2 video clips using ffmpeg but have failed so far. I'm new to ffmpeg and am mostly relying on tweaking what I can find in the documentation ...
user avatar
12 votes
2 answers
16k views

What parameters should I be looking at to reduce the size of a .MOV file?

My Canon 60D creates .MOV files when recording video and I've found out that the .MOV container has an H264 video stream and a PCM audio stream. I've used ffmpeg and GSpot to look at some of my ...
Ward - Trying Codidact's user avatar
313 votes
16 answers
214k views

Combine one image + one audio file to make one video using FFmpeg

This should be pretty trivial, but I can't find a way to get it to work. I want FFmpeg to take one JPEG image and an audio file as input and generate a video file of the same duration as the audio ...
matteo's user avatar
  • 4,419
74 votes
6 answers
142k views

How to open and repair an m4v or mp4 video file?

Yesterday I was filming a scene with my phone but suddenly the application crashed and when I try to open the m4v generated it says that is corrupted. I have downloaded the video files (around 36MB) ...
Drake's user avatar
  • 5,684
34 votes
4 answers
30k views

Accurately cut video files from command line

I'm having trouble finding a cli application that can take a video file (avi, mkv, and mp4 preferably) and cut out very short clips (2-6 seconds) with precision time accuracy. I've tried ffmpeg, ...
curmil's user avatar
  • 1,065
57 votes
1 answer
50k views

Why can't Quicktime play a movie file encoded by FFmpeg? [duplicate]

When I try to open a movie I just created with the command: ffmpeg -pattern_type glob -i '*.JPG' -s 640x480 movie.mp4 I get an error from QuickTime: The document “movie.mp4” could not be opened. ...
Michael's user avatar
  • 2,754
46 votes
4 answers
41k views

FFmpeg - Apply blur over face

I'm trying to blur a portion of a video using FFmpeg (specifically to blur a face). I have been trying to use a combination of timeline editing and the various bluring filters, but I cannot find a ...
occvtech's user avatar
  • 1,840
16 votes
5 answers
12k views

Automatically split large .mov video files into smaller files at black frames (scene changes)?

I have 65 .mov video files named tape_01.mov, tape_02.mov, ..., tape_65.mov. Each is about 2.5 hours long and takes up many gigabytes. They are digital copies of what were VHS tapes (my family's "...
Ryan's user avatar
  • 1,976
14 votes
7 answers
63k views

What subtitle file editor for '.srt' files supports synchronization? [closed]

I downloaded .srt files for watching a French movie. But unfortunately, it is out of sync. Is there any tool in Windows using which I could manually sync it specifying the start time?
softwarematter's user avatar
14 votes
4 answers
137k views

Calibrate two monitors to the same video settings

Background: Just started a new job as a software developer for an amazing company. I have at my workstation two beautiful 22” LCD monitors. It just happens, however, that the laptop port replicators ...
Kevin L.'s user avatar
  • 1,584
5 votes
7 answers
250k views

What format is "undf"?

By accident, I recently removed some videos from my phone. I tried to restoring them with Recuva and TuneUp Utilities and the results were "undf" files. I tried to open with VLC, Media Player Classic ...
kvizii's user avatar
  • 357
4 votes
1 answer
2k views

ffmpeg is not even cutting this and other mp4s to the nearest second [duplicate]

I have a file Other - Analogue Clock-JEJqy1Wlovw.mp4 which is just a download from https://www.youtube.com/watch?v=JEJqy1Wlovw It's 2 minutes 13 seconds long. I had some issues cutting it to the ...
barlop's user avatar
  • 24.2k
2 votes
4 answers
4k views

Linux: How to list all video files with exactly 720p resolution?

I have several video files with different resolutions. Now I want to list only the video filenames with e.g. 720p resolution. I prefer one liners on the bash command line and I can receive helpful ...
Linuxwhisperer's user avatar
0 votes
3 answers
3k views

Convert video into format which is most likely playable on a windows system

I have some flv and mp4 videos, which I need to convert to a format which is playable on an a Windows Vista system (for a presentation). The problem is, that I cannot test the videos on the system on ...
student's user avatar
  • 475
86 votes
8 answers
46k views

What are the differences of watching a 1080p and a 720p version of the same media on a 720p screen?

Say I have 1280x720 pixels on my screen and the current resolution is set to 1280x720 as well. What are the differences between the 1080p version and the 720p version of the same media? Is it ...
Varaquilex's user avatar
  • 3,856
72 votes
7 answers
127k views

What is the correct way to fix keyframes in FFmpeg for DASH?

When conditioning a stream for DASH playback, random access points must be at the exact same source stream time in all streams. The usual way to do this is to force a fixed frame rate and fixed GOP ...
Mark Gerolimatos's user avatar
56 votes
8 answers
216k views

How can I merge two mp4 files without losing quality?

I have two high-quality mp4 files, which are of two parts of the same show. I want to merge them together into 1 file, and I usually use VirtualDub to merge my files... But it doesn't seem to support ...
Paolo Bergantino's user avatar
33 votes
5 answers
54k views

Change framerate in ffmpeg without reencoding

I have a mkv (h264) video that is 23.976 fps (24000/1001) but I want to convert it to 25fps without reencoding and loosing quality. I know mkvmerge can do it ( with option --default-duration '0:25fps')...
phate89's user avatar
  • 445
28 votes
3 answers
48k views

FFMPEG / libx264: How to specify a variable frame rate but with a maximum?

Instead of providing a fixed frame rate to FFMPEG/libx264 (-r/-framerate), I would like to specify a variable frame rate with a MAXIMUM value, and allow libx264 to down the frame rate as it sees fit. ...
Mark Gerolimatos's user avatar
27 votes
11 answers
98k views

How do I convert an animated GIF to a YouTube friendly video format?

My son has made some animations with Pivot Stickfigure Animator which we'd like to upload to YouTube. The problem is Pivot saves as animated GIFs which I can't upload to YouTube. The Wikipedia ...
David Webb's user avatar
  • 12.1k
11 votes
1 answer
12k views

ffmpeg: smooth zoompan with no jiggle

I'm trying to create a basic 5 second zoompan to the center of an image (from the example on the ffmpeg.org website). The command below works, but jitters more than my hands after 5 cups of coffee: ...
Timbo White's user avatar
10 votes
7 answers
31k views

How to keep VLC player in minimized mode?

I'm using VLC media player which can play almost all kinds of audio and video formats. While listening to audio, I keep VLC in minimized mode and can work on other windows. But when I select to listen ...
user113701's user avatar
7 votes
1 answer
4k views

Is it possible to RDP into Windows Server 2008 on a machine without any video card or integrated graphics?

Basically, I plan to install Windows Server 2008 R2 x64 on a machine by plugging in the video card initially and then I plan to remove it completely because I need the slot for something else. The ...
eek's user avatar
  • 431
4 votes
1 answer
12k views

How to soft code an MKV with subtitles?

I have an avi and corresponding .srt file for subtitles. I hate having two files for this movie, so what I want to do is convert this file to mkv as I heard it can hold subtitles. I have handbrake ...
GiH's user avatar
  • 4,027
2 votes
7 answers
934 views

Free video converter software for Mac? [closed]

I'm using Mac OS X 10.5 and am looking for a free video converter software which supports mp4, avi, and wmv files (and perhaps rmvb, too). I want to convert avi, wmv, and rmvb files to mp4 to be able ...
Lilly's user avatar
  • 87
1 vote
1 answer
12k views

Convert ffmpeg encoding from libx264 to h264_nvenc

The video hosting website LBRY suggests users try the following command to compress their uploads: ffmpeg -i input.avi -c:v libx264 -crf 21 -preset faster -pix_fmt yuv420p -maxrate 5000K -bufsize ...
Iain's user avatar
  • 4,768
162 votes
6 answers
251k views

How to retrieve video file information from command line under Linux?

I'd like to see from command line all informations pertaining to a given video file, including length, quality, bitrate, resolution, audio and video formats, number and language of audio streams and ...
Sekhemty's user avatar
  • 9,516
80 votes
3 answers
94k views

FFMPEG Splitting MP4 with Same Quality

I have one large MP4 file. I am attempting to split it into smaller files. ffmpeg -i largefile.mp4 -sameq -ss 00:00:00 -t 00:50:00 smallfile.mp4 I thought using -sameq would keep the same quality ...
Chris Weber's user avatar
  • 1,305
79 votes
1 answer
128k views

Add audio to video using FFmpeg

I’m trying to add sound to a video using FFmpeg, but for some reason, when I play the resulting file, it doesn't have any sound. I also tried doing it with an aac audio file, as well as leaving out -...
Arlen Beiler's user avatar
  • 1,650
52 votes
6 answers
340k views

How do I rotate video (MOV) file on Windows?

I recorded a video (on iPhone) in portrait mode. Now I need to rotate it. Right now I have a MOV file. I'm using Windows. What program can I use to rotate and save this video without losing quality?
meddle's user avatar
  • 765
40 votes
3 answers
54k views

How to create an uncompressed AVI from a series of 1000's of PNG images using FFMPEG

How can I create an uncompressed AVI from a series of 1000's of PNG images using FFMPEG? I used this command to convert an input.avi file to a series of PNG frames: ffmpeg -y -i input.avi -an -...
user avatar
10 votes
4 answers
37k views

How can I download a Flash video from a website?

I am trying to download a Flash video, so I can try to convert it to a normal DVD. (FYI: this is a religious video.) Is it possible to download this video? If so, how could I do this?
Vaccano's user avatar
  • 6,726
7 votes
2 answers
5k views

Reduce video frame rate without dropping useful frames

I have a video from a security camera that was originally recorded at a low frame rate, maybe 15 fps, maybe 10 fps, maybe even less. It has since been converted by someone else to 25 fps (without ...
Boann's user avatar
  • 1,166
5 votes
2 answers
14k views

How to get width of the video and scale another video to that width using ffmpeg?

I'm using ffmpeg to stack two videos vertically. They might be different size so I need to scale them to same size. I have found following commands. First one works for different sizes (but won't ...
Lesenger's user avatar
5 votes
1 answer
2k views

Upscaling video with different filter on each side

I need scale up video from one DOS game using FFmpeg. But with Nearest-neighbor interpolation on left side and xBR filter on the other one. Input (320x200) Output (1280x800) Here is a command, ...
Matěj Pokorný's user avatar
5 votes
2 answers
7k views

Use later frame for video thumbnail in Windows 7

I've got a collection of videos and most of the thumbnails generated are useless as they are of a frame very early on, in most cases the title sequence. Is there any registry setting or something to ...
Duncan McDougall's user avatar
2 votes
2 answers
2k views

How to convert SWF to uncompressed AVI?

Can someone explain how to convert .SWF files to uncompressed .AVI files. Which software I'd need or a tutorial I could use?
user avatar
2 votes
1 answer
12k views

ffmpeg settings for converting still images to video for archival

I need to convert a set of still images (static cameras pointed at a road) to a video. I have considered video codecs such as Theora, H.264, VP8, VP9, HEVC, Snow. The video should have a minimum ...
Maxim Fedorov's user avatar
113 votes
8 answers
249k views

How to extract one frame of a video every N seconds to an image?

How can I convert a video file to a sequence of images, for example one frame every N seconds. Can mplayer or ffmpeg do this? I have used MPlayer to grab screenshots manually but I would like to ...
Liam's user avatar
  • 3,060
45 votes
7 answers
351k views

How to find the stream behind a Flash player

I am watching a Flash stream. I can watch the same stream in two different players (set up by someone else), but I don't like any of them. Is there a way I can find/get/extract the direct link to the ...
Svish's user avatar
  • 39.9k
44 votes
5 answers
67k views

Joining H264 *without* re-encoding

I have two halves of a single show in two .MP4 files, encoded in H264. I would like to join them without re-encoding. Is this possible? I managed to create a joined video as a Quicktime file (.mov) ...
jdmuys's user avatar
  • 861
43 votes
2 answers
95k views

Repairing corrupt MP4

I took a video from my Android phone (Sony Xperia P, if you need to know), and before I could stop recording it, the phone memory got full and the phone got hanged too. I rebooted the phone, the video ...
noob's user avatar
  • 1,345
33 votes
3 answers
25k views

Is it possible to speed up video with audio using ffmpeg, without changing audio pitch?

Is there a relatively simple way to speed up a video (mp4, with aac encoded audio), by say "x1.25" or "x1.3" while keeping the original audio-video sync, but also retaining the original pitch of the ...
bdutta74's user avatar
  • 659
26 votes
7 answers
54k views

How can I repair a broken AVI file?

I have an .avi file that is about 110mb. When I try to play it with VLC Media Player it says something like "This file is broken. Attempt to repair?" and after it does its thing it is still unable to ...
Paolo Bergantino's user avatar
26 votes
4 answers
29k views

Change rotation flag in MP4 video (without losing metadata)

I just want to change the rotation flag in a .mp4 video file. Many similar questions exist, most answers suggest using ffmpeg -i input.mp4 -map_metadata 0 -metadata:s:v rotate=90 -codec copy output....
aXeL-HH's user avatar
  • 1,009
24 votes
1 answer
30k views

FFmpeg split video and merge back

I'm trying to use FFmpeg to split video based on some start_time and end_time inputs, and replace those with other video files. For instance, for input 10 15 I will need to replace EXACT seconds 10 to ...
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