Questions tagged [video-encoding]
The video-encoding tag has no usage guidance.
99
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How to recover VOB video files in camcoder dvd with udf filesystem which appears empty but it's not
I recently discovered some old double-sided mini dvd-rw disks (2.8GB) which were used for recording video with a Sony DCR-DVD201E handycam. Both sides already had content but they were unfinalized so ...
- 621
0
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1
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64
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How to merge multiple mp4 files as chapters in a final mp4?
I have folder with files named like 0001.mp4, 0002.mp4, ...
I want to merge all these files to a combined.mp4, and I want it to have an internal chapter marks. It is convenient when playing for ...
- 686
0
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0
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77
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Firefox, Chromium on Debian: WebRTC H.264 is not supported
While trying to stream online with my friends, I had an issue where everyone else's computer can watch the stream but mine, and even my android device can watch it.
I found this test page from GitHub ...
- 156
0
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0
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22
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v4l2 Cannot recognize MPEG-4 as an input_format for ffmpeg processing
I'm on an old version of ubuntu (12.0.4) that cannot be updated / not possible to connect to internet. It comes with a bluecherry encoding compression card
https://www.bluecherrydvr.com/product/...
2
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0
answers
146
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add/edit custom metadata fields to video files without remuxing?
TL;DR - Looking for a way to edit/add CUSTOM metadata fields to video files without remuxing.
I have some media files that I add custom metadata fields to (mostly mkv files downloaded with yt-dlp but ...
- 561
0
votes
1
answer
551
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ffmpeg re-encoding to h625 with video of Sea Water doubles file size
I know... there are a lot of questions out there already about reducing the file size with ffmpeg.
But, here's why my question is a bit different, it addresses having difficult content. I think ...
0
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1
answer
100
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Can "v4l2loopback" be installed/compiled for FreeBSD 13.1?
Wondering if anyone was able to compile v4l2loopback for FreeBSD 13.1
If so what are the steps.
I need it for FFMPEG to convert a live USB cam MJPEG video stream from yuv422 to yuv420 on the fly and ...
- 41
0
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1
answer
705
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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 ...
- 1,093
0
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1
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176
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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.
2
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2
answers
9k
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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 ...
0
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0
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118
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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 ...
- 203
0
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1
answer
263
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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:...
- 203
0
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2
answers
875
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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:
...
- 203
0
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1
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891
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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 ...
1
vote
1
answer
876
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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-...
- 141
1
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1
answer
2k
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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 = ...
- 13
2
votes
1
answer
104
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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 ...
- 121
1
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1
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2k
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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 ...
- 286
0
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1
answer
906
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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,...
- 1,418
1
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0
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852
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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
...
- 432
0
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1
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219
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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 ...
- 371
-2
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1
answer
2k
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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, ...
- 4,785
6
votes
2
answers
6k
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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 --...
- 337
10
votes
1
answer
32k
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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 ...
- 101
3
votes
1
answer
1k
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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 ...
- 61
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1
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38
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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 ...
0
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1
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114
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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 -...
- 311
0
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1
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303
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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 :...
- 4,688
1
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1
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5k
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 ...
- 292
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0
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381
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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 ...
- 9,090
1
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1
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635
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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 ...
- 111
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0
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193
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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 ...
- 131
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1
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2k
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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....
- 111
1
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0
answers
282
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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 ...
- 303
1
vote
1
answer
277
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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 ...
- 790
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0
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292
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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 ...
- 966
3
votes
1
answer
1k
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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, ...
- 12.9k
1
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1
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2k
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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 ...
- 73
8
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1
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2k
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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 ...
- 113
2
votes
1
answer
2k
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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 ...
- 21
3
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1
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2k
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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 ...
- 141
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1
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809
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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 "...
- 13
0
votes
1
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5k
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"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 -...
- 4,688
1
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1
answer
4k
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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 ...
- 2,853
5
votes
1
answer
1k
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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 ...
- 171
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0
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293
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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,...
- 111
2
votes
1
answer
829
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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 ...
- 26.6k
1
vote
1
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782
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=...
- 243
0
votes
1
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694
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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 ...
- 759
8
votes
2
answers
16k
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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 ...
- 245