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Sur d’autres sites (6422)

  • Extracting audio from video using fluent-ffmpeg

    12 mars, par Idi Favour

    Im trying to extract the audio from a video, an error is occuring
Error converting file : Error : ffmpeg exited with code 234 : Error opening output file ./src/videos/output-audio.mp3.
Error opening output files : Invalid argument

    


    I use this same directory for my video compression that runs before this one and it works.

    


    ffmpeg()
  .input(url)
  .audioChannels(0)
  .format("mp3")
  .output("./src/videos/output-audio.mp3")
  .on("error", (err) => console.error(`Error converting file: ${err}`))
  .on("end", async () => {
    console.log("audio transcripts");
   
    const stream = fs.createReadStream("./src/videos/output-audio.mp3");
    const transcription = await openai.audio.transcriptions.create({
      file: stream,
      model: "whisper-1",
      response_format: "verbose_json",
      timestamp_granularities: ["word"],
    });
    transcripts = transcription.text;
    console.log(transcription.text);
  })
  .run();


    


  • Revision bfc27bb614 : tx-skip experiment : improve entropy coding of coeff tokens This patch allows th

    31 mars 2015, par hui su

    Changed Paths :
     Modify /vp9/common/vp9_entropy.c


     Modify /vp9/common/vp9_entropy.h


     Modify /vp9/common/vp9_onyxc_int.h


     Modify /vp9/common/vp9_quant_common.c


     Modify /vp9/decoder/vp9_detokenize.c


     Modify /vp9/encoder/vp9_encodemb.c


     Modify /vp9/encoder/vp9_rdopt.c


     Modify /vp9/encoder/vp9_tokenize.c



    tx-skip experiment : improve entropy coding of coeff tokens

    This patch allows the prediction residues of tx-skipped blocks
    to use probs that are different from regular transfrom
    coefficients for token entropy coding. Prediction residues are
    assumed as in band 6.

    The initial value of probs is obtained with stats from limited
    tests. The statistic model for constrained token nodes has not
    been optimized. The probs for token extra bits have not been
    optimized. These can be future work.

    Certain coding improvment is observed :
    derflr with all experiments : +6.26% (+0.10%)
    screen_content with palette : +22.48% (+1.28%)

    Change-Id : I1c0d78178ee9f3655febb6f30cdaef8ee9f8e3cc

  • FFMPEG android very slow converting raw aac to mp3

    24 novembre 2013, par Feras

    I managed to compile ffmpeg for android from this repo :
    https://github.com/aksalj/ffmpeg-android
    So you can see the configuration options in here :
    https://github.com/aksalj/ffmpeg-android/blob/master/config.sh

    The only changes I did were to change the darwin-x86_54 to darwin-x86 since the new r9b NDK only comes with it and also change the androideabi-4.4.3 to androideabi-4.6 again because of the new NDK. I am encoding a raw ADTS aac to mp3, the decoder for aac is libav and encoder for mp3 is libmp3lame. Even though the process works a simple 5 minute aac files (44100, 2ch) is taking about 3 minutes to process. The same file on my mac (with the macports ffmpeg) takes a few seconds.

    I am not sure but are there any optimizations that can be made to the ffmpeg config script or maybe i need to compile ffmpeg with something like libaacplus(even though i think aacplus is used for encoding only, so shouldnt make a difference).Anyways any performance optimizations will be highly appreciated !

    The android device is a US Galaxy S3 (i747m model which has the Snapdragon S4).