Good afternoon,
I need to know how to use Gstreamer to send frame data to a file instead of the framebuffer.
I want to be able to open the file with another program, edit some video data, then forward to the framebuffer.
is there a gstreamer command for doing this?
Thanks,
You need a filesink.
You can simply add one at the end of your pipeline:
mypipeline ! filesink location=myfile
This will write the stream into a file named myfile.
Related
Is there any way by which we can detect and remove silence from an audio file using GStreamer.
Currently, by using level I am able to find the start and end time of silence present in the audio file but how do I remove this silence and produce an output which doesn't have silence in it. I tried using gst_element_seek but no luck there.
There is a removesilence element in gstreamer-plugins-bad, perhaps it is what you want.
Edit: adding example
gst-launch-1.0 autoaudiosrc ! audioconvert ! removesilence remove=true ! fakesink silent=false -v
This launch line will print data to the screen whenever removesilence output buffers, it will be capturing audio from the microphone of your system. It will only output audio when some noise is detected.
So I have a lot of mp4 files on my computer and I read that QT-FastStart is for moving the metadata from the end of the files to the beginning but how do I use or run it ?
Every time I drag and drop a file into qt-faststart, nothing seems to happen?
I downloaded the 64bit version from here:
https://web.archive.org/web/20140206214912/http://ffmpeg.zeranoe.com/blog/?p=59
Do I need a batch file or something or a specific command line parameter to make it run?
Note, QT-FastStart is described here https://manpages.debian.org/stretch/ffmpeg/qt-faststart.1.en.html
qt-faststart is a utility that rearranges a Quicktime file such that
the moov atom is in front of the data, thus facilitating network
streaming.
It can be used (perhaps among other purposes), for making a sample file when demonstrating an issue. One can take a large file, fix it with QT-FastStart, then use dd to cut a sample. And the sample should play. Whereas if you did dd without doing that then it wouldn't or may not play.
See Neil's answer qt-faststart infile.mp4 outfile.mp4
However, QT-FastStart has now been integrated into ffmpeg.
ffmpeg -i original.3gp -codec copy -movflags +faststart fixed.3gp
List item
simple. in CMD prompt run qt-faststart infile.mp4 outfile.mp4
What we need to do is either, extract the audio from a group or singular Vob video file and convert it to a .Wav format. Now the process of actually extracting the audio and converting it can be done from a third party application however this application has to be activated from a batch or c# script. The media we are retrieving the vob files from always comes from the CD drive and will always be placed in the same folder location once the conversion is complete.
In shot I need a program or script that can be activated remotely to extract and convert vob files to .WAV.
Any help will be greatly appreciated.
I only install ffmpeg on Windows and put in cmd this command:
ffmpeg -i [VOB_file_route].VOB [WAV_file_output_route].wav
And that's all, just works.
To do somthing like this you will need to use VLC and cmd they work togeather well and will allow you to strip video and audio from a file easily
I am writting a program as http://www.screencast-o-matic.com/. I used applet and import jmf.jar to my project. When I use it, it couldn't get anything capture devices so it couldn't capture audio and video.
I captured screen to video but it hadn't sound. I captured sound but it hadn't video. I use jmf to merger 2 stream to video file. But it error.
Everybody can help me to resol problem. Thanks your help.
You can use Xuggle-Xuggler http://www.javacodegeeks.com/2011/02/introduction-xuggler-video-manipulation.html API which is wrapper of FFmpeg command line tool. Both are open source.
Every x minutes I grab an image from a network-cam. Now i want to add this picture to an existing video file - on the fly.
I don't want to keep numerous image files and then encode them once in a while with e.g.
mencoder mf://#${LIST} -mf type=jpg:fps=${FPS} ...
The video format/codec doesn't really matter, as long as standard tools (mplayer, ffmpeg, vlc, ...) can handle it.
Any ides or suggestions?
Thanks in advance!
One obvious way which should work (at least according to my first tests) is to just write the new jpeg image to the end of the video file - so the video is a mjpeg stream.
cat ${PIC} >> ${VIDEO}
This is an answer to my question, however i was looking for something consuming less space than the pictures stored each by its own would take up.
Other hints?