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• Save frame as image during video stream using ffmpeg, in C

  30 avril 2017, par George T.

  I’m using the Parrot SDK3 to retrieve the video stream from a Bebop2 drone. From it I need to "extract" a frame and save it as an image.

  The whole code can be found here, but I shall try to include the (what I understand as) important parts here.

  Where the video is sent to mplayer. I assume from this that the video format is h624.

  if (videoOut != NULL)
  
  {
  
      if (codec.type == ARCONTROLLER_STREAM_CODEC_TYPE_H264)
  
      {
  
          if (DISPLAY_WITH_MPLAYER)
  
          {
  
              fwrite(codec.parameters.h264parameters.spsBuffer, codec.parameters.h264parameters.spsSize, 1, videoOut);
  
              fwrite(codec.parameters.h264parameters.ppsBuffer, codec.parameters.h264parameters.ppsSize, 1, videoOut);
  
  
  
              fflush (videoOut);
  
          }
  
      }
  
  }

  Where the frame is received and written to videoOut, to be displayed

  eARCONTROLLER_ERROR didReceiveFrameCallback (ARCONTROLLER_Frame_t *frame, void *customData)
  
  {
  
      if (videoOut != NULL)
  
      {
  
          if (frame != NULL)
  
          {
  
              if (DISPLAY_WITH_MPLAYER)
  
              {
  
                  fwrite(frame->data, frame->used, 1, videoOut);
  
  
  
                  fflush (videoOut);
  
              }
  
          }
  
      }
  
      return ARCONTROLLER_OK;
  
  }

  The idea I had in mind is to fwrite(frame->data, frame->used, 1, videoOut); to a different file but that just creates a corrupted file, probably because of encoding. In what way can I get this frame and store it to a separate image ? The preferable image filetype .png, .jpg or .gif

  Any help will be greatly appreciated ! Thanks in advance !

• Free music recognition API

  12 mars 2014, par AmirH

  I'm developing an application to recognize the music played by speakers. It records 32 seconds of the sound played and send a request via an API of music recognition. So far I used Echonest. But my api_key has been banned because of to many requests since I published my freeware, used by more than 200 users.

  So I looked for MusicBrainz but it needs the exact duration of the entire song to receive a acceptable response, duration that my application can't guess.

  So I'm looking for a free music recognition API so my freeware works. Do you know one ?

  Note : I used Echonest by :

  • capturing 32 seconds with ffmpeg

  • sending this command via cURL :

    curl -F "api_key=XXX" -F "filetype=mp3" -F "track=@sound.mp3" "http://developer.echonest.com/api/v4/track/upload" > info.txt

  I tried to use MusicBrainz by :

  • capturing 32 seconds with ffmpeg

  • generating the fingerprint using Chromaprint with this command :

    fpcalc sound.mp3 > fingerprint.txt

  • sending this command via cURL :

    curl -F "client=XXX" -F "meta=recordings" -F "duration=32" -F "fingerprint=ABC" "http://api.acoustid.org/v2/lookup" > info.txt

• ffmpeg in server cant upload video over 4 minutes

  12 octobre 2020, par Victor01288888

  here's my code

  


    ffmpeg(stream)
      .output(videoPath)
      .on("start", function () {
        console.log("Starting video compression... please wait...");
      })
      .on("error", function (err) {
        console.log("Something went wrong: " + err.message + " " + err.name);
      })
      .outputOptions(
        "-vcodec",
        "libx264",
        "-crf",
        "35", // change the crf value: high = lower quality & size, low = higher quality & size
        "-format",
        "mp4"
      )
      .on("progress", function (progress) {
        console.log(
          "Processing: " +
            Math.round(progress.currentKbps / progress.targetSize) +
            "% done"
        );
      })
      .on("end", async function () {
        console.log("[ffmpeg] processing done");
        // finish compressing then upload to S3
        console.log("uploading to S3... please wait");
        // const stream2 = await fileType.stream(createReadStream());
        let stream2 = fs.createReadStream(videoPath);
        // saving data in aws(s3)
        let origin = uploadToS3(`${newFileName}`);
        stream2.pipe(origin.writeStream);

        origin && (await origin.promise);
        await Video.updateOne({ _id: video._id }, { status: "success" });

        // del tmp video
        fs.unlink(videoPath, (err) => {
          if (err) {
            console.error(err);
          }
          console.log("Converted file delete from tmp folder server");
        });
      })
      .run();


  


  I uses this code in my server.
If I upload video in 1 minute it's ok.
But when I upload one more then 4 minute it just not appears in AWS.
and the journey only writes 0% without any error.