All Questions
183
questions
38
votes
5
answers
93k
views
Python extract wav from video file
Related:
How to extract audio from a video file using python?
Extract audio from video as wav
How to rip the audio from a video?
My question is how could I extract wav audio track from video file, ...
- 843
38
votes
1
answer
3k
views
GStreamer encountered a general stream error in Qt5 raspberry pi
I'm trying to play a video using QtMediaPlayer in Raspberry pi 2 B. The source code is as follows:
QMediaPlayer *media;
QVideoWidget *video;
...
...
media = new QMediaPlayer(parent);
video = new ...
- 1,135
25
votes
2
answers
25k
views
converting all the mp4 audio files in a folder to mp3 using ffmpeg [duplicate]
how can I convert all of the mp4 files in a given folder to mp3 using ffmpeg.
Almost all of the links I have seen on google is all about converting mp4 video to mp3.
I can do this via VLC player but I ...
- 7,968
24
votes
3
answers
31k
views
GStreamer vs FFmpeg
I try to record a Video with the OpenCV Framework an would like to save that into an Matroska(mkv) Container together with some additional data streams.
First I thought using FFmpeg is the way that.
...
- 249
19
votes
2
answers
52k
views
how to stream live videos with no latency (ffplay, mplayer) and what kind of wrapper could be used with ffplay?
I have been testing playing multiple live streams using different players because I wanted to get the lowest latency value. I tried gstreamer player (gst-launch-0.01), mplayer, totem and ffmpeg player ...
- 715
13
votes
2
answers
24k
views
Look for fastest video encoder with least lag to stream webcam streaming to ipad
I'm looking for the fastest way to encode a webcam stream that will be viewable in a html5 video tag. I'm using a Pandaboard: http://www.digikey.com/product-highlights/us/en/texas-instruments-...
- 233
13
votes
0
answers
10k
views
FFmpeg vs Libav vs libVLC vs Gstreamer as of 2018 [closed]
I am trying to do some video processing on real time. I was beginning to try the FFmpeg, but I saw this question:
Why would I choose Libav over FFmpeg, or is there even a difference?
Which further ...
- 2,523
11
votes
1
answer
14k
views
How to pipe live video frames from ffmpeg to PIL?
I need to use ffmpeg/avconv to pipe jpg frames to a python PIL (Pillow) Image object, using gst as an intermediary*. I've been searching everywhere for this answer without much luck. I think I'm close ...
- 1,663
10
votes
2
answers
8k
views
Receiving video stream from an IP camera on android
I have an IP camera which is streaming video in MJPEG format. Now my aim is to receive it and display it in my own custom android app. For this I have three programming alternatives on android ...
- 645
9
votes
3
answers
9k
views
How to install gstreamer0.10-ffmpeg on Debian 8 Jessie (No installation candidate)
On a clean Debian 8 installation i had to install some gstreamer-plugins. While most of them were already installed or were easily installable via apt-get, gstreamer0.10-ffmpeg was not installable:
...
- 936
9
votes
0
answers
531
views
Embed custom meta-data (bounding boxes) into HLS video stream
I'd like to embed bounding boxes, labels, etc. into live video stream to optionally draw them thereafter on the client-side in web-browser and looking for a way how to do.
Could you please give me a ...
8
votes
0
answers
679
views
Building an RTSP streaming server from processed frames in OpenCV
I have to process frames from a distant camera using OpenCV.
I need to stream the processed frames to be accessible over network as a live video.
How to make the processed frames (cv::Mat objects) ...
- 1,896
7
votes
1
answer
6k
views
Using Gstreamer or ffmpeg to create rtsp client on Android
I want to stream a rtsp stream on android and I finally have come to
conclusion that I can't use android API's MediaPlayer,Videoview etc because
latency is big issue for me. I need an latency of <...
- 899
6
votes
1
answer
6k
views
Turn a video into a sequence of images using GStreamer (not ffmpeg)
I have an ogg vorbis video. It plays fine in totem and mplayer. I want to covert it to a sequnces of images, one image per frame. I can do this on ffmpeg with the following command:
ffmpeg -i video....
- 59.4k
6
votes
0
answers
2k
views
Gstreamer missing Decoder meta/x-gst-fourcc-mebx
I'm currently working with GStreamer in a Linux environment and encountered an issue after upgrading from GStreamer 1.18 to 1.22. While trying to process a video file, I received the following error ...
- 81
6
votes
3
answers
7k
views
Lossless avi encoding on linux
I am trying to write video using opencv. It is important for me to do this precisely - so it has to be a lossless codec. I am working with OpenCV 2.4.1 on Ubuntu 12.04
Previously, I was using the ...
- 761
5
votes
2
answers
6k
views
v4l2loopback device detected by Chrome, not seen by Zoom or Firefox
I am trying to create a loopback device from my webcam to be accessible from both Zoom and a browser. I created three v4l2loopback devices:
sudo modprobe v4l2loopback devices=3 video_nr=10,11,12 ...
- 51
5
votes
2
answers
5k
views
GStreamer on Android
Can anyone give me any tips on getting GStreamer to work on Android. I have never used it before and I would like to use it with FFmpeg (I already have FFmpeg compiled and works fine on Android). I ...
- 11.3k
5
votes
4
answers
7k
views
Combine multiple videos into one
I have three videos:
a lecture that was filmed with a video camera
a video of the desktop capture of the computer used in the lecture
and the video of the whiteboard
I want to create a final video ...
- 35.1k
4
votes
1
answer
9k
views
GStreamer Tee (Multiple Multiplexer)
I'm trying to store a video stream (coming from my webcam) into a MKV and FLV file. This means I have to split the video and audio pipeline after the h264 Encoding and mux each path with a different ...
4
votes
3
answers
3k
views
How to make Gstreamer return only keyframes?
In gstreamer pipeline, I'm trying to figure out if there's a way to specify that I only want key frames from a RTSP stream.
In ffmpeg you can do this with with -skip_frame nokey flag. E.g.:
ffmpeg -...
4
votes
1
answer
6k
views
How do I add a delay to a live stream sourced from webcam (v4l2) with FFMPEG?
How can I use FFMPEG to add a delay to a stream being sent from a (v4l2) webcam to a media server?
The use case here is something like a security camera where I want to be able to stream video to a ...
- 43
4
votes
1
answer
18k
views
How to convert y4m file to yuv? [closed]
I searched the internet and Stack Overflow, but I could not find an answer:
Does anyone know how to convert a y4m file to yuv?
- 363
4
votes
3
answers
2k
views
Lossless codec for bayer data
I'm working with lots of camera's which capture in BG bayer pattern natively.
Now, every time I record some data, I save it to the disk in the raw bayer pattern, in an avi container. The problem is, ...
- 598
4
votes
1
answer
4k
views
gstreamer h264 multicast missing SPS/PPS information
I have two video streaming units capable of streaming live video inputs:
AXIS Q7424-R Video Encoder
EPIPHAN VGADVI Broadcaster 99460 -
I am using gstreamer to view these streams on client terminals ...
- 803
4
votes
0
answers
3k
views
Video streaming through HAProxy
I want to stream video from my webcam to many clients (all clients use html 5 video player).
Now i have this:
Server:
sudo gst-launch-0.10 tcpserversrc port = 1234 ! oggparse ! tcpserversink port = ...
- 71
3
votes
1
answer
2k
views
Change bitrate of USB camera
I use ELP USB camera with h264-codec output.
Ffmpeg-command to take the video stream:
ffmpeg -i /dev/video1 -c:v copy output.ts
As result I have a video with 4Mb bitrate - this value is too high ...
- 497
3
votes
1
answer
4k
views
Not able to pipe gstreamer output into ffmpeg
has anybody gotten gstreamer to successfully pipe it's video output into ffmpeg?
I've tried playing with /dev/stdout and I keep getting errors:
gst-launch -e v4l2src device=/dev/video0 ! 'video/x-...
- 279
3
votes
1
answer
4k
views
GStreamer force decodebin2 output type
I'm trying to write a program in C which replicates the pipeline:
gst-launch -v filesrc location="bbb.mp4" ! decodebin2 ! ffmpegcolorspace ! autovideosink
DecodeBin2 has a dynamic pad and I've ...
- 657
3
votes
1
answer
449
views
"Relocation cannot be used against local symbol" only for one platform (x86)
Problem
I am cross-compiling gstreamer using Meson, and it works for 3 different platforms (android-arm, android-arm64, android-x86_64) but fails for android-x86 with errors like:
ld: error: ...
- 7,647
3
votes
2
answers
12k
views
Desperately looking for a RTSP server that can stream from a live source (not from a file)
I need a RTSP-server that can listen on a configured port (8554 for example), and then, for example, if I run FFmpeg with:
ffmpeg -f v4l2 -i /dev/video0 -c:v libx264 -intra -an -f rtsp -...
- 542
3
votes
0
answers
2k
views
Errors when streaming h264 video from gstreamer to ffmpeg
Hi I am trying to receive a udp/rtp stream with ffmpeg in the client side but is having trouble.
Server side pipeline:
gst-launch-1.0 -v filesrc location=video2.mp4 ! decodebin ! x264enc !
...
- 41
3
votes
1
answer
845
views
how to deal with live raw h264 stream to send over network
what I want to do is that send live camera stream which is encoded by h264 to gstreamer. I already have seen many example which send over network by using rtp and mpeg-ts. But problem is that all ...
- 1,217
3
votes
0
answers
3k
views
How to Add Gstreamer Plugin on Mac when installed from Tutorials
I basically have two installs of gstreamer on my Mac OS X machine:
The one that works perfectly was installed following this tutorial (http://docs.gstreamer.com/display/GstSDK/Installing+on+Mac+OS+X) ...
- 1,077
3
votes
0
answers
694
views
OpenCV - CvVideoWriter codec error in raspbian
I'm making something like black box in raspberry pi.
I set OpenCV 2.4.3 and many video libraries.
( I referred this site - Opencv cannot acces my webcam )
And I compiled this sample code.
#include &...
- 31
3
votes
1
answer
2k
views
Gsteamer rtp video mixer, found a working pipeline, however need improvement
I'm attempting to mix multiple rtp h264 payload video streams into a single video stream of 15FPS.
A working pipeline that mixes two video streams over a videotestsource pattern of 15FPS
VIDEO_CAPS=...
- 1,426
2
votes
1
answer
7k
views
android live streaming - h264 decoding
Since i'm a little familiar with android and video streaming, i know it's complicated to handle live video streams from device to device.
Requirement: play incoming raw h264 stream
Are there any ...
- 51
2
votes
2
answers
984
views
Is seeking to specific frames of an MJPEG video faster than doing the same for an h.264 file?
I am recording video and will need to seek to a specific frame in the video quickly and randomly.
I can record the video in MJPEG or h.264 compression standards.
I understand that MJPEG produces ...
- 31.2k
2
votes
2
answers
8k
views
Raspberry Pi USB Webcam Stream to Computer using Gstreamer
I have a fisheye usb webcam attached to a raspberry pi that I'm trying to stream to a computer. I've played with ffmpeg and it seems a little laggy beyond 320x240. From what I've read people have been ...
- 2,792
2
votes
1
answer
1k
views
What kind of stream GStreamer produce?
I use following 2 commands to stream video from Raspberry Pi
RaPi
raspivid -t 999999 -h 720 -w 1080 -fps 25 -hf -b 2000000 -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 ...
- 6,344
2
votes
3
answers
4k
views
How do I use the Windows version of gstreamer and wireshark to take a .pcap file and extract H.264 from RTP?
I have a pcap file containing a capture of RTP with H.264 video and SIP with SDP. I would like to be able to extract the video from the RTP stream and save it to a file. (h264video.mkv or something ...
- 189
2
votes
1
answer
697
views
Adding timestamps to HEVC with ffmpeg library, mismatch in timestamps when run with Gstreamer pipeline
We are encoding sample frames using NvEncoder with HEVC. Since HEVC frames do not have any timestamps, in order to perform seek operation on the video, we wrote a remuxer in C++ that creates ...
- 81
2
votes
1
answer
3k
views
gstremer plugin ffdec_h264 is missing after installing gst-libav package codebase
My system is Ubuntu 15.04 64 bit.
I have downloaded https://gstreamer.freedesktop.org/src/gst-libav/gst-libav-1.8.3.tar.xz
and performed below steps.
./configure --prefix=/usr
make
sudo make ...
- 26.7k
2
votes
2
answers
1k
views
GStreamer: Using type find
I've got a filesrc connected to a typefind element. On the "have-type" signal I print out the capibilities. What can I do with this information? I.e:
"Media type video/mpeg, systemstream=(boolean)...
- 657
2
votes
1
answer
2k
views
How to live-stream 360 video from a PC to VR headset/goggle/HMD?
I have some code that captures footage from cameras and outputs a stitched 360 video. I can output stitched videos as MP4 files, RGBA files, or RGBA OpenGL textures.
I need to somehow get my code to ...
- 410
2
votes
2
answers
2k
views
Keeping video file playable while recording to it
I am trying to stream a file , starting from an arbitrary position , that i am recording to at the same time. But until i stop recording the file seems to be not playable.
Recording
gst-launch-1.0 -...
- 163
2
votes
1
answer
2k
views
Cannot get JACK Audio/Netjack working over LAN
I'm trying to stream low latency audio between 2 raspberry pis. Both gstreamer and ffmpeg induce 2+ second delays for me.
I've played around with Jack Audio and locally on a single pi it seems ...
- 2,792
2
votes
2
answers
562
views
Differences in multimedia frameworks
I've been recently investigating different multimedia frameworks for adding audio and video capabilities to my applications.
I've been looking at phonon, gstreamer, ffmpeg, libvlc/vlc.
However, I ...
- 21
2
votes
0
answers
516
views
Trying to install openCV from source but GStreamer and FFMPEG not recognized
I have tried building the openCV lib from source so I can utilize cpp for a project I am planning instead of python. Before I had it installed using pip and decided to wipe all of the files related to ...
- 113
2
votes
0
answers
1k
views
Why is ffmpeg and vlc able run RTSP stream but gstreamer is unable to?
I have a RTSP server streaming out h264 video. Both ffmpeg (ffplay uri)and vlc are able to stream the video but gstreamer is unable to.
Below is the output of gstreamer when gst-play uri is launched:
...
- 37