Recherche avancée

Sur d’autres sites (14020)

• ffmpeg - trying to add a reversed section of original video to the back (boomerang effect)

  23 janvier 2020, par sn0ep

  I have a ffmpeg command as follows which basically scales the video down to 720p. Now i want to add a section to my command which will make a concatination of the video but in reverse. So that the video will also be in a loop like this :

  0s -> 10s -> 0s

  original command :

  ffmpeg -ss 0.0 -to 10.0 -i in.mp4 -filter_complex "fps=15,scale=720:-1" -y out.mp4

  Command after my edits :

  ffmpeg -ss 0.0 -to 10.0 -i in.mp4 -filter_complex "[0:v]fps=15,scale=720:-1,reverse,fifo[r];[0:v][r] concat=n=2:v=1 [v]" -map "[v]" -y out.mp4

  When executing im getting following erorrs :

  Parsed_concat_4 @ 0x7feb89d01d40] Input link in1:v0 parameters (size 720x1280, SAR 1:1) do not match the corresponding output link in0:v0 parameters (1080x1920, SAR 1:1)
  
  [Parsed_concat_4 @ 0x7feb89d01d40] Failed to configure output pad on Parsed_concat_4
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:1

  I’m very new into coding advanced ffmpeg commands.

• avcodec/decode : copy the output parameters from the last bsf in the chain back to...

  27 juillet 2018, par James Almer

  avcodec/decode : copy the output parameters from the last bsf in the chain back to the AVCodecContext
  Certain AVCodecParameters, like the contents of the extradata, may be changed
  
  by the init() function of any of the bitstream filters in the chain.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/decode.c

• DirectShow Encryption and Decryption Filters incorrect path leading to wrong decoding ?

  11 mai 2016, par Michael Chi Lam

  Situation : I’m creating two DirectShow Filters cryptography. I’ve written them as In place transformations however it’s not working as planned, I believe it has something to do my encoding and decoding paths. My source is an AVI and my output a encrypted MP4. (Encryption Filter) for my decryption filter I take in a mp4 and render the video. However when I attempt to render the video, the play back is a black screen.

  AVI to MP4 on GraphStudioNext :
  

  MP4 to Video Renderer :
  

  Both of them works, however when I insert my Cryptography(This is the encryption, I got lazy and didn’t rename it properly) and Decryption filter respectively it doesn’t work

  I placed my Encrypt and Decrypt side by side (See below) and it generates an mp4 that I can play back.
  

  Question : Is there a filter I am missing on the decoding path ? (Mp4 to Render)