Questions tagged [video]

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

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10 views

Cannot allocate memory - FFMPEG

While giving effects to multiple video using FFMPEG. I am getting error Error while filtering: Cannot allocate memoryme=00:06:02.98 bitrate= 676.0kbits/s dup=22 drop=0 speed=4.58x Failed to inject ...
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Vokoscreen VP9 Codec in Debian 10 Buster

Kdenlive for Debian Buster allows me to render using the VP8 and VP9 codecs. Also, I think Vokoscreen 3.0.8 for Win 10 allows me to record using VP9. Unfortunately, when I install Vokoscreen 2.5.0 ...
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1answer
12 views

Youtube-style controls for video & audio in Chrome

When playing a 'plain' audio or video file in Chrome, such as when directly accessing a .mp3 or .mp4 file on your local storage, the default Chrome player is very bare-bones - a play/pause button, ...
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18 views

Set background color /transparency for ffmpeg showwaves filter

The posts here were super helpful. I am just using the showwaves filter (at the moment) to generate a visualization, like this: ffmpeg -i input.mp3 -filter_complex \ "[0:a]showwaves=mode=cline:s=...
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9 views

Using Windows Game Bar to record in the background, how can I reduce the file size?

I use Windows Game Bar to record in the background sometimes. I am fine with the small drop in performance. I set the settings to Standard Resolution and 3 minute recordings. However, when I save the ...
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2answers
43 views
+50

Have ffmpeg merge a matte key file over the normal video file removing the background

I currently have two ffmpeg videos. Video one is a matte key file , that looks like so Video two, would be the normal video without the background and just the person. How would I go about merging ...
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Extract Video content from temporary extension-less files (obtained from Screen recorder extension of Google chrome)

I have used the screen recording extension available on the Google Chrome web browser on 6th May to record an examination video of 3 hours' duration. But, when the recording was stopped, the extension ...
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1answer
16 views

Fade-in turns whole video stream to black

I've adapted the following crossfade from Gyan to create a video from an image and an audio file, and then crossfade it with an outro. This works fine, but I also want to have the first video stream ...
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1answer
26 views

HLS stream created from webcam with ffmpeg is not displayed correctly

I want to create a HLS live stream from my webcam using ffmpeg. I have this command which creates files used by HLS to stream the video in input. sudo ffmpeg \ -i path/to/video.mp4 \ -preset ...
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16 views

FFMPEG - Combine Image + Audio into Video, but Output is longer than the Audio File?

I am trying to combine a static image & an audio into a video. I want the video to be as long as the audio file. I am using ffmpeg and am executing it via nodejs: var args = [ "-loop"...
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When piping from ffmpeg to ffplay, the ffplay video window does not appear. Is there some way to observe ffplay output in real time?

When I run a single ffplay play command like the following: ffplay "/home/pete/Desktop/2FPS-copy.webm" I get a terminal output and video output window like this: However, when I am piping ...
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37 views

FFMPEG warning pkt->duration = 0

I'm facing a strange WARNING message in the logs of FFMPEG when trying to capture an HLS stream. This is the log with some information changed to avoid problems with my boss: [info] Input #0, hls, ...
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1answer
22 views

With ffmpeg and input of a webm video file, how do I 'play the video'/output in real time to a new webm file and pipe to play in ffplay

Note, I am saying 'real time' in the description as I want the option in ffmpeg where it outputs the video in the same amount of time as the video takes to play. Sorry if I am using the wrong words to ...
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9 views

Automatically playing video files in succession? [closed]

I have some video files which I wish to automatically play one after another. I don't want the player to close / re-open each time a video ends / begins, and would like it to play continuously, as if ...
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How do I block non educational content on youtube recommendations for Safari? [migrated]

There've been a plethora of posts about users wanting to completely block all youtube recommendations. I too was considering the same thing, as I find it can be quite distracting. However I do use ...
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18 views

How to troubleshoot bluetooth audio for a Surface tablet?

From bluetooth settings (start ms-settings:bluetooth) clicking disconnect and connect generates an audible pairing message from the headset. Hower, youtube or other video only seems to play over the ...
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15 views

FFmpeg overlay video

I have a bg video (bg) and a main video (main). If bg is shorter, i can loop overlay [bg][main] to keep the length of main ok but bg will be loop = duplicated. ffmpeg -y -i "{input}." -...
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mpeg file cannot be replayed

I have problems replaying some mpeg file with SMPlayer. Below is the log. The other UMP just quickly counts the time but nothing can be heared. Some other WMP opens a dialog with error. So nowhere I ...
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1answer
36 views

How was this video made

ok guys I'm genuinely confused how this video was made and was wondering whether anyone could shed light on how this video might have been made or encoded or something. this video in discord is 51 ...
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1answer
30 views

ffmpeg about fps, q and interlaced

My command without sound: ffmpeg -f dshow -rtbufsize 2147.48M -video_size 640x480 -i video="Roxio Video Capture USB" -c:v libx264 -pix_fmt yuv422p -preset ultrafast -bufsize 3968k -crf 0 R:/...
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27 views

Most efficient way to convert 60fps 16:9 to 25fps 4:3 in ffmpeg

I'm trying to capture and convert 25fps PAL VHS using just the equipment I have and so far I'm able to make a good quality (albeit stretched to 16:9) progressive capture of a VHS but my capture device ...
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32 views

Why does streaming an MP4 video file from a WordPress site work fine in the browser yet fail when I'm trying to save it to a file?

I am trying to learn more about streaming and why a video that plays fine in the browser is so tricky to download to a local hard drive for offline playing. It's hosted on WordPress and the full URL ...
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9 views

ffmpeg configuration dialog in Linux

When playing video files on Windows, and when ffmpeg is used (as a filter?) - I remember getting a taskbar icon for it, which I could right-click to open a rich configuration dialog, with all sorts of ...
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19 views

how can I read all file in a folder and compute PSNR for them using ffmpeg command as a batch file?

I have some videos that I encode them to mp4 file using FFmpeg, now I need to write a batch file that read all the file in a folder and compute PSNR for them and save in separate text file for each ...
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14 views

Screen goes black for a couple of seconds when swapping between something fullscreen and something not fullscreen

Whenever I swap to something fullscreen (like a video game, or a fullscreen mode in like a video site), or swap out of full screen. The screen goes black for a few seconds. There are a couple of old ...
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1answer
40 views

Do CPU and GPU work *together* for rendering HEVC?

I have a home theater PC that I built 7 years ago. The CPU is fairly low-end (Intel i3-4360). It only has 2GB system RAM. I recently tried for the first time to play fairly high bitrate (20Mbps) 4k ...
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2answers
46 views

How to cut video in multiple place and combine them without re-encoding using FFMPEG?

Let's say I have 10-minute video, I want to remove 1:00-2:00 and 4:00-5:00 Is that possible to do that on one FFmpeg command? (Other program also welcomed) Or maybe a command to cut the part that I ...
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14 views

How to deduce and overlay variable framerate of video with duplicate frames using ffmpeg?

I have a lossless video recording of a game without screen tearing. The video itself is at a constant 60fps, but the game framerate varies between 20-30 fps due to performance issues we are debugging. ...
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1answer
77 views

Does ffmpeg really use my Graphics card to encode?

I have a NVIDIA Quadro P620. I have a lot of research on how to accelerate my transcoding using my graphic card. I stumble on this page https://trac.ffmpeg.org/wiki/HWAccelIntro#...
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1answer
48 views

What makes a valid .mp4 video?

I am downloading back to back some .ts video chunks from a website and saving them on the same file. When I try to upload this file to sites like twitter and facebook it doesn't accept it as a valid ...
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2answers
486 views

Batch command to rename filenames like 'The Kids Performances (2020).mp4' to 'Kids Performances, The (2020).mp4'

My family has recordings of the children's performances in school and extracurricular activities saved over the years as primarily .avi and .mp4 files. I have been asked to take all these files (there ...
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1answer
16 views

ffmpeg split JPEG-encoded MOV video into frames without reencoding

I have a MOV video file from an old digital camera where the video stream is just a series of JPEGs. I'm trying to extract those JPEGs without reencoding them (or at least come as close to the ...
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6 views

Gnome Subtitles - how to merge different files

I found Gnome Subtitles to be an excellent program for creating video subtitles and translations. Now I have a long documentary that is originally divided into multiple chapters and individual video ...
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19 views

Windows: slow-motion in different soft programs (Video player, MS Word, MS Powerpoint)

After Windows reinstallation I faced a problem. When I use different programs they work improperly: KMPlayer: when I play some video in plays in slow-motion (not related to the player's settings). ...
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1answer
40 views

In what order should I use stabilization and compression with ffmpeg?

I shoot videos of soccer games on a Canon Vixia which records at 60fps HD with h264 compression. From the camera it results in 20GB files which I have been recompressing (to save on storage and ...
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13 views

Transparent PNG series with audio and camera feed with ffmpeg

I have a series of PNG images with a transparent background that I'm looking to overlay on top of a camera feed and include audio. I am trying to do it with ffmpeg, but I am also open to doing it ...
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8 views

What are some methods for automatically generating an.srt to go along with AWS Polly output?

I am making speech to text youtube videos that give an "audiobook" like experience for old archived news articles. I have a personal AWS account and have learned to use Polly for the text to ...
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14 views

speedup preview of video while it is being downloaded using FFMPEG

I need to download cca 10min clip from a much longer video from server every day. So to save bandwidth and time, I want to see a preview and stop right after the desired part ends while it is still ...
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1answer
17 views

ffmpeg cut to frames and merge without quality loss

I am trying to cut a mpg file to frames, and subsequently merging them again with ffmpeg: ffmpeg -i input.mpg -vsync 0 -q:v 2 temp/%03d.bmp ffmpeg -i temp/%03d.bmp -y output.mpg My goal is to ...
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1answer
45 views

m3u8 to mp4 lossless conversion with VLC or any other free software on Windows

I have read this and several other posts on this site; however, none has answered my question: I'm aware, that I can convert m3u8 streaming file to the mp4, and I only do this with VLC player on ...
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0answers
33 views

Change the speed of subtitles in an srt file

I have a set of videos that were recorded at 25 fps. That was the original speed of the video and I want to keep it that way. The video and audio work fine. I have a corresponding set of subtitle ...
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59 views

What is the best scaling algorithm for FFmpeg?

This is a more up-to-date version of this question here, which luckily it avoids being a duplicate of because that question is about VirtualDub rather than FFmpeg. This is not a subjective question as ...
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7k views

Why does Counter Strike: Condition Zero not play intro videos in Windows if the installation path has spaces in it?

I have Counter Strike: Condition Zero game. Whenever I install it in a folder like C:\FolderName and launch the game after intallation, the game starts with 2 intro videos (I found those videos inside ...
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42 views

FFmpeg 4:3 video with letter box to 16:9 without encode/lossless

Im reading and trying about this but I do not get it. I have a video in 720x576 in 4:3 and would like put off the letter box and put the video in 16: 9 Anyone knows or can gives me a hint?
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20 views

PC video flashes in text mode

I have a computer I've installed Freedos on, but the video output goes blank in text modes for a second every 10 to 20 seconds. This happens in Linux, too, so I assume it's not the fault of Freedos. ...
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1answer
81 views

AV1 extract keyframes

Using this file [1], I can run this command with no problem: ffmpeg -i crushed-between-two-portals.mp4 %d.jpg but if I run either of these commands [2]: ffmpeg -i crushed-between-two-portals.mp4 -vf &...
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1answer
24 views

Audio sounds muffled/muted - but not all of it

I'm viewing an MP4 file with AAC audio, and am experiencing something weird with the audio: I do hear audio; but while the background music seems to sound ok, the characters' speech and other audio ...
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19 views

Available video encoders on Lenovo L580

I have a Lenovo ThinkPad L580 and want to transcode many DVD rips using a tool called other_video_transcoding by Don Melton. This tool allows many different video encoders, and now I am struggling how ...
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12 views

Sharper texts when encoding video to low-quality

I have this script that makes ffmpeg encode video files into MJPEG video format: echo off set arg1=%1 shift ffmpeg-bar -i %arg1% -vcodec mjpeg -vf scale=min'(960,iw)':-1 -acodec pcm_s16le -ar 22050 -...
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40 views

FFmpeg memory leak? (lavfi)

I'm attempting to generate a black 1920x1080 video at 60FPS using the lavfi input, I do this as a means to hook an audio stream to something that'll part at the right times via the segment muxer and ...

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