im trying to construct a pipeline that will read any file (mp3, ogg, flac etc) and updates its tags using the taginject element, but it is not working.
Here are my attempts:
gst-launch-1.0 filesrc location=file.mp3 ! decodebin ! taginject tags="title=bla,artist=blub" ! filesink location=output_file.mp3
Result: The Pipeline runs, but it creates a 50mb file from a 4mb file, and that large file is not playable (and probably not containing tags, also).
gst-launch-1.0 filesrc location=file.mp3 ! taginject tags="title=test,artist=blub" ! filesink location=output_file.mp3
Result: The pipeline runs and creates a playable output file, but it contains no tags.
gst-launch-1.0 filesrc location=file.mp3 ! decodebin ! taginject tags="title=test,artist=blub" ! encodebin ! filesink location=output_file.mp3
Result: The pipeline does not run. It says taginject cannot be linked with encodebin.
I would appreciate any help on this, I just dont know what I am doing wrong (probably using the wrong elements... but I just cant find which are the right ones)
You need to add a muxer after taginject, e.g. something like:
gst-launch-1.0 filesrc location=file.mp3 ! parsebin ! \
taginject tags="title=bla,artist=blub" ! id3v2mux ! \
filesink location=output_file.mp3
Also using parsebin avoids decoding.
Related
I need to demux the video frames and KLV data from an MPEG-TS stream in sync, frame-by-frame.
The following command to demux the KLV data and outputs a text file with the KLV data.
gst-launch-1.0 filesrc location="some_file.ts" ! tsdemux name=demux \
demux. ! queue ! meta/x-klv ! filesink location="some_file-KLV.txt"
The following command to demux the video and outputs a video file.
gst-launch-1.0 filesrc location="some_file.ts" ! tsdemux name=demux \
demux. ! queue ! decodebin ! videorate ! videoscale ! x264enc ! mp4mux ! filesink location="some_file-video.mp4"
On combining the above two:
gst-launch-1.0 filesrc location="some_file.ts" ! tsdemux name=demux \
demux. ! queue ! decodebin ! videorate ! videoscale ! x264enc ! mp4mux ! filesink location="some_file-video.mp4"
demux. ! queue ! meta/x-klv ! filesink location="some_file.txt"
The command doesn't work. It just gets stuck after the following message on the terminal;
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
and, the size text and video files is 0 bytes.
An example .ts file can be found at(this file hasn't been uploaded and created by me, it is part of data for some code on github(https://gist.github.com/All4Gis/509fbe06ce53a0885744d16595811e6f)): https://drive.google.com/drive/folders/1AIbCGTqjk8NgA4R818pGSvU1UCcm-lib?usp=sharing
Thank you for helping! Cheers. :)
Edit:
I realised that there can be some confusion. The files in the link above were just used to create the .ts file.
The .ts file I am using, is available directly in either of the links below:
https://drive.google.com/drive/folders/1t-u8rnEE2MftWQkS1q3UB-J3ogXBr3p9?usp=sharing
https://easyupload.io/xufeny
It seems if we use Gstreamer's multiqueue element, instead of queue, the files are being created.
I tried the above based on a suggestion from a commenter on another website I had posted the question on.
But, the KLV data and frames are still not in sync. That is what I am trying to do now.
Regards.
I'd like to take a screenshot of an existing video - either an mp4 or an flv - using GStreamer1.0
I see multifilesink but it looks like that generates a bunch of images. I'd only like 1.
You can use:
gst-launch-1.0 filesrc location=/media/datos/videos/video.mp4 ! decodebin ! videoconvert ! pngenc snapshot=true ! filesink location=frame.png
I'm looking to decode and demux an mp4 file with gst-launch-1.0. Instead of using a bin - decodebin - I'd rather work with the seperate elements. Unfortunately, I did not find this.
My question is simple: what basic elements are contained in the decodebin?
If you can direct me to a place where I can find the composition of other bins or autopluggers that whould also be nice.
The decodebin will use all available elements in your gstreamer installation. Remember that you can launch the pipeline with decodebin and using verbose -v and guess what elements is the decodebin creating. For example, in the next pipeline that plays succesfully a mp4 file (video and audio):
gst-launch-1.0 -v filesrc location=/home/usuario/GST_/BigBuckBunny_320x180.mp4 ! queue ! qtdemux name=demuxer demuxer.video_0 ! queue ! decodebin ! videoconvert ! autovideosink demuxer.audio_0 ! queue ! decodebin ! audioconvert ! autoaudiosink
Watching the output I can conclude that the resulting pipeline is:
gst-launch-1.0 -v filesrc location=/home/usuario/GST_/BigBuckBunny_320x180.mp4 ! queue ! qtdemux name=demuxer demuxer.video_0 ! queue ! h264parse ! avdec_h264 ! videoconvert ! autovideosink demuxer.audio_0 ! queue ! aacparse ! avdec_aac ! audioconvert ! autoaudiosink
The playback components from gstreamer are available here. The playbin element will give you the full pipeline (video, audio, etc...) from the uri input.
For example, if you even don't know what kind of source you have, you can use playbin element:
gst-launch-1.0 playbin uri=file:///home/usuario/GST_/BigBuckBunny_320x180.mp4 -v
This will play automatically the file (if it is possible), and verbose output will show you the used plugins and status information.
gst-launch-1.0 can create .dot file with pipeline diagram every time pipeline changes state. To enable this functionality, set GST_DEBUG_DUMP_DOT_DIR variable to path where generated files should be saved. In this dir gst-launch-1.0 will create files like 0.00.00.069441527-gst-launch.READY_PAUSED.dot. You can then convert them to .png files using dot from ghraphviz package. To convert one file, use following command:
dot -Tpng 0.00.00.069441527-gst-launch.READY_PAUSED.dot -o0.00.00.069441527-gst-launch.READY_PAUSED.png
You also can convert them all, using following command in bash shell:
ls -1 *.dot | xargs -I{} dot -Tpng {} -o{}.png
You can find more details here:
How to generate a Gstreamer pipeline diagram (graph)
I used the following GStreamer pipeline to store my encoded stream in a binary file:
gst-launch v4l2src ! videorate ! video/x-raw-yuv, framerate=\(fraction\)10/1 \
! videoscale ! video/x-raw-yuv, format=\(fourcc\)I420, width=640, height=480\
! ffmpegcolorspace ! x264enc ! fdsink > vid.bin
Now i want to play previously recorded files in GStreamer using the following pipeline:
cat vid.bin | gst-launch fdsrc ! ffdec_h264 ! autovideosink
But then it gives the following error:
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640: Internal GStreamer error: negotiation problem. Please file a bug at http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer.
Additional debug info:
gstffmpegdec.c(2804): gst_ffmpegdec_chain (): /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640:
ffdec_h264: input format was not set before data start
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
I know that the best way to capture video is using Muxers but is there any way to play my previous files?
Thanks
Not sure your pipeline is right.
If you want to write to a file why not simply use filesink and filesrc.
fdsink > vid.bin will not work fine because if you see the prints by gstreamer gst-launch will also go into the file. [Just open vid.bin in an text editor and you will see what I mean].
Also for x264 stream to be stored without a muxer you need to use byte-stream=1 in your x264enc to store it in annexb format so that it is decodable.
To play back raw x264 stream you need to have a color space convertor before the video sink
gst-launch filesrc location=inputfile ! legacyh264parse ! ffdec_h264 ! queue ! ffmpegcolorspace ! autovideosink
plays just fine here at my end
Or, to playback a raw h264 file with gstreamer 1.0:
gst-launch-1.0 filesrc location=/tmp/video.h264 ! h264parse ! avdec_h264 ! autovideosink
I'm having a problem trying to record audio+video from my webcam to a file. If I use videotestsrc and autoaudiosrc I get everything right (read as in I get a file with audio recorded from the webcam's mic, and test-video image), but as soon as I replace videotestsrc with v4l2src (or autovideosrc) I get Error starting streaming on device '/dev/video0'.
The command I'm using:
gst-launch-0.10 videotestsrc ! queue ! ffmpegcolorspace! theoraenc ! queue ! oggmux name=mux autoaudiosrc ! queue ! audioconvert ! vorbisenc ! queue ! mux. mux. ! queue ! filesink location = test.ogg
Why is that happening? What am I doing wrong?
EDIT:
In fact, something as simple as
gst-launch-0.10 autovideosrc ! autovideosink autoaudiosrc ! autoaudiosink
is failing with the same error (Error starting streaming on device '/dev/video0')
Replacing autovideosrc with videotestsrc gives me test image + real audio.
Replacing autoauidosrc with audiotestsrc gives me real image + test audio.
I'm starting to think that this is some kind of limitation of my webcam. Is that possible?
EDIT:
GST_DEBUG=2 log here: http://pastie.org/4755009
EDIT 2:
GST_DEBUG="v4l2*:5" (gstreamer 0.10): http://pastie.org/4810519
GST_DEBUG="v4l2*:5" (gstreamer 1.0): http://pastie.org/4810502
Please do a
gst-launch-1.0 v4l2src ! videoscale ! videoconvert ! autovideosink
Does that run? If not repeat as
GST_DEBUG="v4l2*:5" GST_DEBUG_NO_COLOR=1 gst-launch 2>debug.log ...
and check the log for errors. You also might want to run v4l-info (install v4l-conf under debian/ubuntu) and report what formats your camera supports.