Questions tagged [video-encoding]

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1answer
52 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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1answer
24 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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1answer
67 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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31 views

removing audio and chapters from multiple dual audio video at once

I have so many mkv files and all off them have dual audio and chapters with it. So I want only the audio that is in my language along with the video and remove the chapter files. there are so many ...
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0answers
173 views

Zoom to a OBS virtual camera fails

I would like to send OBS video output to Zoom as a virtual camera on buster, but my attempt to create a new video device results in failure. The issue seem to be connected to proxmox I have ...
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0answers
150 views

Low latency multiplexed screen streaming over network with gstreamer

I'm trying to stream $DISPLAY :99 and audio (pulseaudio) with very low latency with gstreamer to 1-3 viewers which can join the stream at any moment. Create virtual $DISPLAY :99 with Xephyr: Xephyr -...
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0answers
21 views

how to install BPG encoding

how to install BPG Encoding on google colab( which is similar to linux as I think) My problam is that I have some input images on png format and I want to compress them using BPG
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1answer
61 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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1answer
978 views

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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1answer
449 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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0answers
296 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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1answer
70 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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1answer
977 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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2answers
3k 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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0answers
14k 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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1answer
649 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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1answer
20 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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1answer
52 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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1answer
205 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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1answer
2k 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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0answers
322 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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1answer
335 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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0answers
160 views

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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1answer
1k 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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0answers
274 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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1answer
230 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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0answers
221 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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1answer
963 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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1answer
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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1answer
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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1answer
1k 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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1answer
1k 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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1answer
624 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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1answer
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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1answer
2k 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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0answers
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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0answers
209 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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1answer
773 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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1answer
615 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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1answer
565 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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2answers
11k 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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1answer
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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2answers
1k views

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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0answers
4k views

How to re-encode file A.mp4 with the same settings as B.mp4?

I have a MP4 file with AAC audio and H264 video, let's call it B.mp4. I also have file A.mp4 with the same picture resolution, but: different FPS possibly different audio/video bitrate different ...
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1answer
835 views

gstreamer dependencies in HandBrake on fedora

I'm running HandBrake on Fedora 23. The "show preview" feature is not able to actually play video, raising two popups: "Missing GStreamer plugin: MPEG-4 AAC Decoder" and "Missing GStreamer plugin: H....
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3answers
5k views

ffmpeg: nvenc mit crf option - very low bitrate

I bought a new computer some time ago. I installed nvenc for ffmpeg to encode my videos with the H.264 codec. To optimize I used the -crf option but something went wrong. I want to encode a full ...
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1answer
1k views

ffmpeg output.mp4 with size 0

I have a video upload script in php where I exec the following command: exec("/usr/bin/ffmpeg -i ".$folder."/".$filenameIn.".mp4 ".$folder."/".$filenameOut.".flv 2>&1", $output); And the ...
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0answers
164 views

What's the canonical way to get individual stream size in a video file?

I have a video file. It contains a video stream, and a couple of audio and subtitle streams. I want to get the size of each of these streams. I've already looked at ffprobe/avprobe and mediainfo, to ...
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0answers
238 views

Convert video with broken codec information

I downloaded using youtube-dl from https://www.dr.dk/tv/live/dr2#!/ The saved file is .flv, but it does not play with vlc/mplayer. avconv cannot convert it: $ avconv -i hl.flv hl.mp4 avconv version 9....
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1answer
1k views

avconv “Error while opening encoder for output stream” for subtitles?

I'm trying to convert a video changing the audio codec from aac to ac3_fixed: avconv -i input.mkv -c:v copy -c:a ac3_fixed output.mkv However this commands aborts after showing the following output: ...