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• FFMPEG command runs if I am not using a specific input

  16 août 2022, par sivafe9540

  the following ffmpeg command would run if I was to switch the -loop 1 -t 10 -i image.png (which allows me to take an image and make it a ten second video) to normal video input, like input1.mp4...

  


  Here is the command that does not work :

  


  ffmpeg -loop 1 -t 10 -i image.png -f lavfi -i input2.png -filter_complex "[0:v][1:v] overlay=W-w:600" -pix_fmt yuv420p -c:a copy -shortest output.mp4


  


  Here is the command that proves -loop 1 -t 10 -i image.png is the problem because it works without it.

  


  ffmpeg -i input1.mp4 -f lavfi -i input2.png -filter_complex "[0:v][1:v] overlay=W-w:600" -pix_fmt yuv420p -c:a copy -shortest output.mp4


  


  My theory

  


  My theory is that the input of the image that is being turned into a ten second video has to be rendered before the filter complex tries to overlay it but it is not... and I don't know hoe to do that.

  


  Non helpful error

  


  zsh: parse error near &'

  


  Requirement

  


  Please do not make solve this issue with more than one ffmpeg command.

  


• ffmpeg abuffersink not connected to any source, possible cause ?

  1er octobre 2019, par OBX

  Trying to split numerous files to smaller segments using ffmpeg. say around 16k audio files of which each of 1 hour duration to smaller segments, the number of files total to convert from .mp3 to .wav sums to 7 million.

  What I do is, I’ve created a list of commands in a file :

  ffmpeg -i 1.mp3 -acodec pcm_s16le -ac 1 -ar 16000 -ss 0 -t 53.788 splitted/1-warren-1.wav
  
  ffmpeg -i 1.mp3 -acodec pcm_s16le -ac 1 -ar 16000 -ss 53.788 -t 3.029 splitted/1-warren-2.wav
  
  ffmpeg -i 1.mp3 -acodec pcm_s16le -ac 1 -ar 16000 -ss 667.237 -t 6.494 splitted/1-warren-70.wav

  The aformentioned file contains 7M commands identical to this, and then I pass it to GNU Parallel to parallely process using 96 cores of the CPU. While it was running I did a grep for errors, and it turned out 9.5k files threw the errors in nohup.out, which all were identical to this :

  Error while processing the decoded data for stream #0:0
  [trim for output stream 0:0 @ 0x55d7edab4d60] Error configuring the atrim filterInput pad "default" with type audio of the filter instance "out_0_0" of abuffersink not connected to any source
  Error reinitializing filters !

  What is possibly causing this and how to effectively fix it ?

• Problems using Cuda for video transcoding [closed]

  19 août 2022, par Jay Adlard

  I just bought a new pc as my faithful old windows 7 i7 laptop died. Now the laptop had both intel and nvidea gtx660m chips. When I transcoded video with handbrake the intel graphics managed 8fps when I changed over to the nvidia it managed 80fps and the graphics card got nice and hot so was obviously working.

  


  The new machine i bought is a i9 with an nvidea gtx780 running windows 10. When I tried to transcode some video hoping for it to use the cpu and Gpu but no joy,the card stays cool power usage is only a handful of watts higher than it running something simple.I had been using handbrake but I read it doesn’t support Cuda so why the laptop speeded up I don’t know. A friend of mine that is into ffmpeg came round found that ffmpeg reports no Cuda yet the card works fine in every other respect. Unlike the rest of the machine the graphics card wasn’t new but it looked like new…

  


  One thing to note I am not talking about nvenc as the quality is rather poor, no point in capturing uncompressed files cleaning them up and not using an encoder that will do 2 pass and an exhaustive search.
Can anyone recommend a reasonably priced encoder that will use the Cuda cores ?

  


  Has anyone got any idea what the problem is ?