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• FFMPEG : how to determine which filters are supported by specific hardware acceleration contexts ?

  7 juin 2020, par John Allard

  I'm having trouble figuring out precisely which filter graph operations are supported by each of the available hardware acceleration methods. I know, for example, that almost all of these methods perform simple operations like scaling, but what about more complicated ffmpeg filters like the new v360 filter or the mestimate filter ?

  



  There's this page (https://trac.ffmpeg.org/wiki/HWAccelIntro) that everyone finds when researching hardware accel with ffmpeg but it mostly touched on encoding and decoding and not filtering.

  


• How to make video effect in video by ffmpeg module in Node JS ?

  20 juin 2015, par Nazmul Hossain Bilash

  I am working with ffmpeg. I want to give effects in video like grayscale, Sepia, Blur in video. Also I want to add text in those videos. How can I make this with ffmpeg in node js. I have worked with fluent-ffmpeg & ffmpeg node module.

  I have seen this article : https://trac.ffmpeg.org/wiki/FancyFilteringExamples Here is the example of video effect by ffmpeg command. But I need to to how I can make this effects through Node JS.

• How concat files URL of S3 using Lambda, Ffmpeg

  4 juillet 2021, par Tính Ngô Quang

  I am trying to concat webm files into 1 file, Then upload file new video to S3
Using S3, ffmpeg/lambda-layer

  


  import subprocess
import shlex
import boto3

def lambda_handler(event, context):
    ffmpeg_cmd = "ffmpeg -safe 0 -f matroska concat"
    ffmpeg_cmd += " -i https://s3demo.s3.ap-northeast-1.amazonaws.com/archives/input/record/mask/ep_1.webm"
    ffmpeg_cmd += " -i https://s3demo.s3.ap-northeast-1.amazonaws.com/archives/input/record/mask/ep_2.webm"
    ffmpeg_cmd += " -c:v copy -af aresample=async=1:first_pts=0 -"

    command1 = shlex.split(ffmpeg_cmd)
    p1 = subprocess.run(command1, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    print(p1.stdout)
    print(p1.stderr)
    # resp = s3_client.put_object(Body=p1.stdout, Bucket=s3_source_bucket, Key=s3_destination_filename2)


  


  I get error message :

  


  


  concat : Read-only file system

  


  


  According to the article below, using directory storage but still the same error.
https://stackoverflow.com/a/47323443/2949104

  


  ffmpeg_cmd += " -vcodec copy -acodec copy /tmp/output.webm -y"