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• 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.

  


• avcodec/pngenc : fix sBIT writing for indexed-color PNGs

  19 juillet 2024, par Leo Izen

  avcodec/pngenc : fix sBIT writing for indexed-color PNGs
  We currently write invalid sBIT entries for indexed PNGs, which by PNG
  
  specification[1] must be 3-bytes long. The values also are capped at 8
  
  for indexed-color PNGs, not the palette depth. This patch fixes both of
  
  these issues previously fixed in the decoder, but not the encoder.
  [1] : https://www.w3.org/TR/png-3/#11sBIT
  Regression since : c125860892e931d9b10f88ace73c91484815c3a8.
  Signed-off-by : Leo Izen <leo.izen@gmail.com>
  
  Reported-by : Ramiro Polla : <ramiro.polla@gmail.com>
  

  • [DH] libavcodec/pngenc.c

• Google cloud speech to text not giving output for OGG & MP3 files

  27 avril 2021, par Vedant Jumle

  I am trying to perform speech to text on a bunch of audio files which are over 10 mins long. I don't want to waste storage on the cloud bucket by straight-up uploading wav files on it. So I am using ffmpeg to convert the files either to ogg or mp3 like :
ffmpeg -y -i audio.wav -ar 12000 -r 16000 audio.mp3

  


  ffmpeg -y -i audio.wav -ar 12000 -r 16000 audio.ogg

  


  For testing purpose I ran the speech to text service on a dummy wav file and it seemed to work, I got the text as expected. But for some reason it isn't detecting any speech when I use the ogg or mp3 file. I could not give amr files to work either.

  


  My code :

  


  def transcribe_gcs(gcs_uri):
    client = speech.SpeechClient()

    audio = speech.RecognitionAudio(uri=gcs_uri)
    config = speech.RecognitionConfig(
        encoding="OGG_OPUS", #replace with "LINEAR16" for wav, "OGG_OPUS" for ogg, "AMR" for amr
        sample_rate_hertz=16000,
        language_code="en-US",
    )
    print("starting operation")
    operation = client.long_running_recognize(config=config, audio=audio)
    response = operation.result()
    print(response)


  


  I have set up the authentication properly, so that is not a problem.

  


  When I run the speech to text service on the same audio but in ogg or mp3(I just comment out the encoding setting from the config for mp3) format, it gives no response, just prints out a line break and done.

  


  What can I do to fix this ?