Recherche avancée

Sur d’autres sites (12212)

• How to print the video meta output by the browser version of ffmpeg.wasm to the console of Google Chrome ?

  17 janvier 2021, par helloAl

  I would like to ask about how to use the browser version of ffmpeg.wasm.

  


  Through my investigation, I know that the following command can be used to output the video metadata to a file in the terminal of windows or mac.

  


  ffmpeg -i testvideo.mp4 -f ffmetadata testoutput.txt


  


  and then I can get this matadata like this :


  


  I want to parse the metadata of the video through the browser, and then print the metadata to the Google console (or output to a file). At present, I know that the browser version of ffmpeg.wasm can achieve this function, but I have looked at its examples, which does not involve this part of the content. (https://github.com/ffmpegwasm/ffmpeg.wasm/blob/master/examples/browser/image2video.html)

  


  But I want to print it to the console of Google Chrome through the browser version(usage:brower) of ffmpeg.wasm (https://github.com/ffmpegwasm/ffmpeg.wasm).
So I want to ask you how to achieve this, thank you.

  


• avfilter/vf_scale : simplify color matrix parsing logic

  31 octobre 2023, par Niklas Haas

  avfilter/vf_scale : simplify color matrix parsing logic
  No need to write a custom string parser when we can just use an integer
  
  option with preset values. The various bits of fallback logic are wholly
  
  redundant with equivalent logic already inside sws_getCoefficients.
  Note : I disallowed setting 'out_color_matrix=auto', because this does
  
  not do anything meaningful in the current code (just hard-codes
  
  AVCOL_SPC_BT470BG fallback).
  

  • [DH] libavfilter/vf_scale.c

• [h264_nvenc : InitializeEncoder failed:supported only with separate color plane on this architecture

  4 janvier 2021, par gpuguy

  I am learning ffmpeg for the first time. What I want is to see how it performs on CPU and on GPU when it comes to transcoding.

  


  My machine is having a GT640 GPU card (GT640 is a Kepler card) and I am running a windows 7 , 64bit.
I issue the following command :

  


  ffmpeg -i lec_2.mp4 -c:v h264_nvenc -profile high444p -pixel_format yuv444p -preset default output.mp4


  


  But I am getting following errors :

  


  [h264_nvenc @ 0000000000363a80] The selected preset is deprecated. Use p1 to p7
+ -tune or fast/medium/slow.
[h264_nvenc @ 0000000000363a80] InitializeEncoder failed: invalid param (8): 444
 is supported only with separate color plane on this architecture.
Error initializing output stream 0:0 -- Error while opening encoder for output s
tream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[aac @ 0000000000365980] Qavg: 18941.322
[aac @ 0000000000365980] 2 frames left in the queue on closing
Conversion failed!


  


  My questions are :

  


  


  1. From this output can I assume that nvenc is supported on my card since it does not complaint of no nvenc supported GPU ?

     


  


  2. How should the above command be modified so as to make it work correctly