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• Fallback input for ffmpeg

  22 septembre 2018, par Daniel Cantarin

  I’m doing some transcoding from a third-party remote input stream that I do not control.

  This input stream has errors from time to time, that I would like to mitigate before sending the stream to my transcoding pipeline, avoiding this way some possible problems in the output.

  I have several ideas regarding different problems. But the most basic scenario I would like to set up is as follows : when the stream is down, or it somehow loses some frames, I want to fill that video gap with a secondary input (like a blank screen, for example).

  For this simple task, I would like to use ffmpeg. I know it can mix, let’s say, an input stream with a fullscreen black square static image. However, I have to deal with this other condition : ffmpeg would run in the same infraestructure for the actual transcoding pipeline. That infraestructure must use its computing power for rendering the output. So, whatever ffmpeg command I end up using should use the minimum possible computing power.

  My actual problem : if I use -vcodec copy, in order to use minimum CPU, I can’t alter the original stream. But if I alter the original stream (by mixing it with some other stream), the operation uses CPU.

  My question : Is there a way to use -vcodec copy, but with a fallback input (instead of a mixed one) for when there are video gaps in the primary stream ?

  Thanks in advance.

• Latch-Based Performance Optimization for Field-Programmable Gate Arrays [on hold]

  22 mars 2014, par user3448912

  how can i replace the flip-flops in fpga by pulsed latches ?i tried that with howard algorithm by writing the verilog code for that.i have to take the area and power analysis.which synopsis tool is useful ?i am getting the timing report from xilinx.

• Call an external dynamic library using node

  25 septembre 2018, par Merc

  I need to edit clips using node using one of the existing video manipulation libraries. (Note : I am aware that I could run an existing editing executable like FFMPEG, but that’s not what I am after).

  Question : What’s the best way to call native libraries in Node ?

  Background information : I will need to talk to one one these libraries : Gstreamer, FFmpeg/LibAV or libVLC.

  My ideal outcome is to have a nice, robust library that I use directly using node, but my lack of experience in terms of using native libraries, and the somehow fragmented world of video editing libraries.