Questions tagged [video-encoding]

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Black screen and freezing when recording with OBS using VAAPI

I'm trying to record my screen with OBS using the GPU accelerated VAAPI encoder. When I start the recording my screen turns off for a couple seconds, and when it turns on the entire display is frozen ...
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  • 173
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31 views

Can ffmpeg concatenate multiple formats in different aspect ratios into one consistent format?

I am building a wrapper for ffpmeg but the concatenate part has me a bit stuck. I am not entirely familiar with ffmpeg or which options and arguments I should be using. How can I concatenate a photo, ...
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176 views

specify h264_vaapi profile in ffmpeg

When I use ffmpeg and vaapi encoder, I know I can specify "profile" in a commandline: ffmpeg ... -i input.wmv -c:v h264_vaapi -profile:v PROFILE_NUMBER output.mp4 Since this I am using ...
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1 answer
190 views

Speed up video by ffmpeg did not reduce file size

I'm following Speeding up playback speed https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video However, when I speed up my playback speed by 1.5, I'd anticipate a reduce of ...
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Find large video files inside sub folders and compress them inside the folder

I want to find all the video files larger than some specific size and compress them and save them in the same directory where it present.
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135 views

ffmpeg "Error initializing bitstream filter: h264_mp4toannexb"

I'm trying to combine two mp4 files using ffmpeg. As per the (rather abstruse) documentation, the following code should combine the files: ffmpeg -i input1.mp4 -c copy -bsf:v h264_mp4toannexb -f ...
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  • 157
2 votes
1 answer
2k views

Ffmpeg libx265 vs hevc_nvenc

I have an Nvidia graphics card, and am using the proprietary drivers. I looked into the ffmpeg H265 encoders available to me, and found hevc_nvenc. Using hevc_nvenc does in fact use the GPU to encode ...
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What's the smallest lossless video codec supported by ffmpeg?

I recorded some 2k 60fps videos with libx264rgb losslessly using the ultrafast preset. They are about 3GB/min. Re-encoding libx264rgb with the veryslow preset only reduces it to 1.6GB/min. Is there a ...
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  • 173
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1 answer
98 views

ffmpeg recording slows down when audio inputs are added

I'm trying to record my screen, my mic, and my game audio with ffmpeg. This command records only my screen. ffmpeg \ -video_size 2560x1440 \ -framerate 60 \ -f x11grab -i :0 \ -map 0 \ -c:a copy \ -c:...
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  • 173
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2 answers
364 views

Hardware accelerated lossless recording on a 6700 XT using ffmpeg

I'm trying to record my screen losslessly (or at near lossless quality) with hardware acceleration on a 6700 XT with ffmpeg. I'm running Linux Mint with the 5.14.14-051414-generic kernel. I've tried: ...
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Low eficience while using dockerized OpenMCU-ru's image

In my work we have a videoconference system in wich we have a lot of SIP videophones. We use a VM (runing over VMWare on an HP Proliant server, on wich are runing also others VMs) wich run OpenMCU-ru ...
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  • 350
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1 answer
461 views

Can I use V4L2 to read a h264 video file input stream instead of a camera stream?

I'm trying to find a small clear example of using V4L2 in c or c++ for how to read directly from a h264 video file on disk. Alternatively how I can pass a parsed full frame h264 chunk/packet to a open ...
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1 vote
1 answer
427 views

Capturing all frames with VLC scene-filter

I'm attempting to use VLC's scene-filter to extract all frames from an mp4 video. The video in question runs at 25fps, and is precisely 38s long. In the command line, I ran with options: --video-...
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  • 141
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1 answer
1k views

how to download partial content from remote video url in nodejs?

I have the following code to download a specific part (range) of a video using nodejs http.get(), const fileUrl = 'https://www.example.com/path/to/video.mp4' const fs = require('fs') const http = ...
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2 votes
1 answer
85 views

Why are my colors separated/shifted when using obs/v4l2sink/v4l2loopback?

Im using OBS with v4l2sink and v4l2loopback to edit my video for a remote trainig. The preview in obs looks fine, but the video has some serious color shifts in any tool I try to display the ...
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1 answer
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Stream Intel RealSense camera to network using Raspberry Pi 4 with FFMpeg

Good day all So I have trying to stream my Intel Realsense D435 camera to my local network. After reading up on many different sites, tutorials, etc I figured out the following: What can I do with ...
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732 views

Cut dvbsub from MPEG-TS with ffmpeg

I have a bunch of MPEG-TS files, originally created by a hardware TV-recorder. ffprobe lists their content like so: Input #0, mpegts, from 'recording.ts': Duration: 02:14:57.67, start: 87544.254878,...
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1 vote
0 answers
560 views

Command line VOB to AVI/MP4 with good quality and deinterlace

I have some VOB files, grabbed from DVDs. I need to make AVI/MP4 files for uploading online. The original resolution is 720p and I want 720p, but need to scale as the pixels are not square (720x480 to ...
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1 vote
1 answer
149 views

Does ffmpeg support dropping chroma information when encoding dynamic scenes?

Video encoders use a lot of techniques to fit the bitrate restrictions. With high compression level even the simple MJPEG compression may partially or totally discard the chroma information. I wonder ...
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-2 votes
1 answer
1k views

Using ffmpeg to Compressed a Two Frame Video

I'm trying to use Ubuntu Linux 19.04 to convert an OpenShot video into a more efficient file-size. The video only contains two still images, and 20 minutes of audio, but for each file-type I save-as, ...
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5 votes
2 answers
5k views

Trans-coding hevc / x265 video file using VLC and viewing it on a chromecast

I've been successful at getting VLC to stream a x264 encoded file from a network file share to an old chromecast (which mine doesn't support hevc / x265 directly) using the commands below. vlc -vv --...
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8 votes
1 answer
23k views

How to significantly lower a video file size with ffmpeg without quality loss?

I see there are videos on youtube with 1080p resolution that are more than 10 minutes long and only 50-60 mb in size. I have a video only 3 minutes long and only 720p resolution but unable to bring ...
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3 votes
1 answer
898 views

IMX6 ADV7180 : no /dev/media0

I am using kernel 4.14.24 from kernel.org on a KARO-TX6Q and an ADV7182 on a custom board. With the kernel 4.1.15 from KARO git, I used the adv7180_tvin driver modified to work with adv7182. This ...
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1 answer
27 views

Random lines during screen recording playback

Every time I record or screencast my desktop, once I play it back I get random lines appearing now and then, no matter what media player I use. They're either black or they show fragments of my ...
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-1 votes
1 answer
59 views

Accelerating Video Conversion

I like to compress large video files before storing them to hard disk. In Fedora-29-bash, I currently use the following ffmpeg command for re-encoding; it balances compression with quality: ffmpeg -...
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0 votes
1 answer
262 views

Cannot send desktop capture to ffserver?

I am simply trying to send a ffmpeg stream consisting of a desktop capture to a local ffserver: # ffserver >/dev/null 2>&1 & # ffmpeg -video_size 1600x900 -framerate 25 -f x11grab -i :...
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  • 4,306
1 vote
1 answer
4k views

Stream/broadcast live video to local network (without VLC)

I am trying to make a perfect mobile webcam fitting my needs with the RPI and camera module I have here already. I run Arch both on the RPI and on the Laptop I intend as the "client". I have the cam ...
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1 vote
0 answers
354 views

trim video files via audio track information

Is there a way to pass a folder of .mp4 files and trim them by audio track? Say the first 20 seconds has no loud audio and the last 20 seconds has no loud audio, is there a way to remove the first and ...
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1 vote
1 answer
466 views

Split 4 Track WAV file into 2 stereo WAV files

The audio recorder my friend has can record 4 tracks at the same time, but unfortunately i records into a 4-track WAV file. The problem i have is that the DAW i use only accepts mono or stereo WAV ...
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h.264 video codec in konqueror

Visiting the page https://www.youtube.com/html5 from within konqueror I saw that the H.264 video codec is not supported. My question is: Is it possible to enable it for konqueror in any way? I'm ...
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0 votes
1 answer
2k views

H.264/MPEG-4 from PNG frames: how to, and how to tune compression

I often create digital animations by preparing all the frames in .png format (with minimal compression), that I need to convert to video format for upload to websites such as reddit, instagram, gfycat....
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1 vote
0 answers
278 views

Patching fourcc code INZI

I am using Ubuntu 16.04 64 bit to try to capture RGB and Depth images from a Realsense SR300 depth camera. I have installed the appropriate SDK etc, and the camera is being recognised and producing ...
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1 vote
1 answer
255 views

Create CBR TS file from MXF file

I am looking for a way to create CBR TS file from a high bitrate MXF input file. I have tried to use ffmpeg, but apparently it doesn't do a good job of creating CBR output file so right now I am a bit ...
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263 views

Convert corrupted VideoCD for uploading to YouTube

I have some home videos on VideoCDs and I would like to transfer to YouTube so I can share them with family. I backed up the CD images on my drive with dd and playing back those images with mplayer ...
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3 votes
1 answer
1k views

Hardware accelerated h.264 transcoding on i.MX6

Preface: I have a lot of .mts video recordings (mainly 576 to 720 lines) I need to cut and transcode to lower bitrate h.264. Nowadays I do this on with an all-in-one tool on my 2009 Core2Duo MacBook, ...
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1 vote
1 answer
1k views

Find all videos by codec (and not by container formats or MIME type)

How can I get the list of all my videos with the used video codec? I found some intersting commands like mediainfo, ffmpeg or exiftool but they giving a lot of informations only by one video. The ...
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8 votes
1 answer
2k views

Handbrake new VP9 codec is grayed out

Handbrake new VP9 codec is grayed out and could not be used. I installed Linux Mint fresh from ppa repo that is referenced on their homepage. libav and the vpx-tools are installed. What have I ...
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2 votes
1 answer
2k views

Adjusting keyframe rate ffmpeg/v4l2 Logitech C920 to YouTube Live

I am trying to stream video from a Logitech c920 to YouTube live via ffmpeg. I have a setup that works in Twitch, but YouTube rejects the stream with the message: Please use a keyframe frequency ...
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3 votes
1 answer
2k views

CUDA Context for NVENC not found after system suspend

Context I recently updated my nVidia drivers to 375.26 and recompiled FFmpeg N-83180-gcf3affa and OBS 17.0.2-5-g43e4a2e (sorry if these numbers don't mean anything, I'm not quite sure what version ...
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  • 141
1 vote
1 answer
711 views

FFMPEG glue MPEG TS

I have movie split in many parts with duration 10-30 seconds. All movies are MPEG TS files. I want to merge them. I try to make following: ffmpeg -f concat -i join.txt OUTPUT.TS and ffmpeg -i "...
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  • 13
0 votes
1 answer
5k views

"MPEG-1/2 does not support 3/1 fps" when sending webcam to ffserver

I am unable to send a stream to my ffserver. I started the server with ffserver -f /etc/ffserver.conf & where ffserver.conf has not been modified. I tried sending a webcam stream with ffmpeg -...
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1 vote
1 answer
3k views

What is the format name to have a MP4 video as output in ffmpeg?

The following command ffmpeg -f alsa -ac 2 -i plughw:0,0 -f video4linux2 -s vga -i /dev/video0 -f ogg - > video.mp4 Does not produce a .mp4 video. I want to replace -f ogg with -f <mp4 ...
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5 votes
0 answers
1k views

Don't wait for audio stream with ffmpeg/avconv using named pipes

I have two named pipes, audio_conv and video, for s16le and h264 streams, respectively. I want to convert them to webm format on fly. Data to these pipes proceeds from my application, that parses ...
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1 vote
0 answers
256 views

Encoder to msrle format with FFMPEG

I need to create some files for an old windows API, for a video playback. The native windows files which works with this old API have the format of MSRLE. They are used as small animations during copy,...
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  • 111
2 votes
1 answer
800 views

Handbrake on Debian not aware of x265 despite installed

I am about to convert a lot of old MKV files encoded with x264, which at the moment are un-downloadable, to more efficient HEVC (x265, H.265) format, using HandBrake software. My system being Debian ...
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1 vote
1 answer
695 views

Add filters to ffmpeg presets

I would like to add filter parameters under ffmpeg preset (e.g. -spre directive). Suppose a simple test.ffpreset under ~/.ffmpeg like this: vcodec=h264 bitrate=1200 acodec=copy How do we add hqdn3d=...
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0 votes
1 answer
639 views

ffmpeg bash script segment template

I was trying to control ffmpeg file segment function through a bash script to cut a large movie file into smaller pieces. I took a look at the documentation here but this doesn't really cover what I ...
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7 votes
2 answers
14k views

Convert image based subtitle to text based subtitle inside MKV file

How do I convert a hdmv_pgs_subtitle (which is image based) to a text based subtitle in a MKV file? I have tried ffmpeg -i in.mkv -c:v copy -c:a copy -c:s mov_text out.mkv but that results with the ...
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1 vote
1 answer
2k views

Convert .264 to .mp4 using avconv

I have a video file (with no audio stream) taken from a Lorex CCTV DVR. The video file has a suffix of ".264" which I assume means its format is raw h264. I cannot play this video on certain ...
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  • 111
1 vote
2 answers
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avconv commandline for downsampling HD video to SD

I'm trying to downsample a HD video recorded by TVheadend to SD size using the following command: avconv -i infile.ts -map 0:v -map 0:a:0 -map 0:a:1 -c copy -c:v mpeg2video -r 25 -qscale:v 2 -s:v ...
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