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• How can I combine two audios into one, but using the length of the first audio ?

  21 avril 2021, par vaginatorZalupi

  There are two audios. I need to connect them to each other (two channels), but with the same length as the first. I found a command on Stack Overflow that partially solves my problem : ffmpeg -i AgAD3RMAAvgr.ogg -i audio.mp3 -filter_complex amix=inputs=2:duration=longest output.mp3.

  


• Issue with openh264enc gstreamer plugin and tcp connections

  20 septembre 2016, par agaldos

  I am trying to stream over TCP encoded video into a EC2 Instance. Using "x264enc" encoder, all works correctly. I get the frames and generate the video correctly.

  The issue comes when I try to use the "openh264enc" encoder.

  If I put in the server "nc -l -p 5555" I can check that data is arriving into the port but when I put the pipeline goes to PREROLLING state and nothing more happens. If I cut the process in the sender, this message appears in the server :

  ubuntu@ip-172-31-87-56:~$ gst-launch-1.0 -e -v tcpserversrc host=ec2-52-29-128-23.eu-central-1.compute.amazonaws.com port=5555 ! h264parse ! mpegtsmux ! filesink location=file.ts
  
  Setting pipeline to PAUSED ...
  
  /GstPipeline:pipeline0/GstTCPServerSrc:tcpserversrc0: current-port = 5555
  
  Pipeline is PREROLLING ...
  
  ERROR: from element /GstPipeline:pipeline0/GstH264Parse:h264parse0: No valid frames found before end of stream
  
  Additional debug info:
  
  gstbaseparse.c(1281): gst_base_parse_sink_event_default (): /GstPipeline:pipeline0/GstH264Parse:h264parse0  
  
  ERROR: pipeline doesn't want to preroll.
  
  Setting pipeline to NULL ...
  
  /GstPipeline:pipeline0/GstTCPServerSrc:tcpserversrc0: current-port = 0
  
  Freeing pipeline ...

  Pipeline used in the EC2 Instance, the server :

  gst-launch-1.0 -e -v tcpserversrc host=ec2-52-29-128-23.eu-central-1.compute.amazonaws.com port=5555 ! h264parse ! mpegtsmux ! filesink location=file.ts

  Sender pipeline with x264enc :

  gst-launch-1.0 -e videotestsrc horizontal-speed=5 ! x264enc ! tcpclientsink port=5555 host=52.29.128.23

  Sender pipeline with openh264enc :

  gst-launch-1.0 -e videotestsrc horizontal-speed=5 ! openh264enc ! tcpclientsink port=5555 host=52.29.128.23

• Vertical video subtitles burn font size

  20 mai 2020, par fantom

  I have two videos, one of them is has display aspect ratio (DAR) 16:9 (horizontal) and another one has 9:16 (vertical). I need to burn in subtitles into them, and for horizontal video I need to set Fontsize=18. But if I try to use the same settings with vertical video, I get very big text size, so I need to set Fontsize=10 to get the same size of letters as in horizontal video.
The question is, why I get different displayed font sizes for different DAR and is there any way to have one settings for both (I don't know up front which orientation video will have when burning subtitles and want to not depend on it)