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• avcodec/libzvbi-teletextdec : fix txt_default_region limits

  9 juin 2020, par Marton Balint

  avcodec/libzvbi-teletextdec : fix txt_default_region limits
  Max region ID is 87. Also the region affects not only the G0 charset but G2 and
  
  the national subset as well.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/decoders.texi
  • [DH] libavcodec/libzvbi-teletextdec.c

• libav ffmpeg - streaming from both a mkv and input stream

  20 janvier 2020, par kealist

  I am trying to use ffmpeg libraries in C# with AutoGen bindings. The overall issue is that I am taking a collection of sources, some streams, and some .mkv containing recordings of a stream. As for now, they are all h264 and only video. For input streams, I am able to adjust the packets and broad cast them and that works fine, but any time I try to call av_interleaved_write_frame with packets from the MKV file, I get the error Error occurred: Invalid data found when processing input.

  Here is the main loop, where the error happens for mkv files. Is there an extra step ?

  /* read all packets */
  
  while (true)
  
  {
  
      if ((ret = ffmpeg.av_read_frame(ifmt_ctx, &packet)) < 0)
  
      {
  
          Console.WriteLine("Unable to read packet");
  
          break;
  
      }
  
      stream_index = (uint)packet.stream_index;
  
      type = ifmt_ctx->streams[packet.stream_index]->codecpar->codec_type;
  
      Console.WriteLine($"Demuxer gave frame of stream_index %{stream_index}");
  
  
  
  
  
      /* remux this frame without reencoding */
  
      ffmpeg.av_packet_rescale_ts(&packet,
  
          ifmt_ctx->streams[stream_index]->time_base,
  
          ofmt_ctx->streams[stream_index]->time_base);
  
  
  
      if (packet.stream_index < 0)
  
      {
  
          Console.WriteLine("Packet stream error");
  
      }
  
  
  
  
  
  
  
      ret = ffmpeg.av_write_frame(ofmt_ctx, &packet);
  
      if (ret < 0)
  
      {
  
          goto end;
  
      }
  
      else
  
      {
  
          ffmpeg.av_packet_unref(&packet);
  
      }
  
  }

  Anything need to be different for MKV files ?

  I get some contradictory error output where it claims it is annex b but also isn’t :

  [AVBSFContext @ 00000220eb657080] The input looks like it is Annex B already
  
  Automatically inserted bitstream filter 'h264_mp4toannexb'; args=''
  
  [mpegts @ 00000220ebace300] H.264 bitstream malformed, no startcode found, use the video bitstream filter 'h264_mp4toannexb' to fix it ('-bsf:v h264_mp4toannexb' option with ffmpeg)

  Verbose output from ffplay from an MKV file :

  ffplay version git-2020-01-13-7225479 Copyright (c) 2003-2020 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20200111
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 38.100 / 56. 38.100
  
    libavcodec     58. 65.103 / 58. 65.103
  
    libavformat    58. 35.102 / 58. 35.102
  
    libavdevice    58.  9.103 / 58.  9.103
  
    libavfilter     7. 71.100 /  7. 71.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Initialized direct3d renderer.
  
  [h264 @ 00000165ed18d140] Reinit context to 640x480, pix_fmt: yuv444p
  
  Input #0, matroska,webm, from '.\webcam_14_Test1.mkv':   0B f=0/0
  
    Metadata:
  
      ENCODER         : Lavf58.12.100
  
    Duration: 00:00:39.30, start: 0.000000, bitrate: 1943 kb/s
  
      Stream #0:0: Video: h264 (High 4:4:4 Predictive), 1 reference frame, yuv444p(progressive, left), 640x480 [SAR 1:1 DAR 4:3], 1k fps, 30 tbr, 1k tbn, 60 tbc (default)
  
      Metadata:
  
        DURATION        : 00:00:39.299000000
  
  [h264 @ 00000165f424e200] Reinit context to 640x480, pix_fmt: yuv444p
  
  [ffplay_buffer @ 00000165f52ea840] w:640 h:480 pixfmt:yuv444p tb:1/1000 fr:30/1 sar:1/1
  
  [auto_scaler_0 @ 00000165ed1d2c80] w:iw h:ih flags:'bicubic' interl:0
  
  [ffplay_buffersink @ 00000165f424ef00] auto-inserting filter 'auto_scaler_0' between the filter 'ffplay_buffer' and the filter 'ffplay_buffersink'
  
  [auto_scaler_0 @ 00000165ed1d2c80] w:640 h:480 fmt:yuv444p sar:1/1 -> w:640 h:480 fmt:yuv420p sar:1/1 flags:0x4
  
  Created 640x480 texture with SDL_PIXELFORMAT_IYUV.
  
  [AVIOContext @ 00000165ed179a40] Statistics: 9547965 bytes read, 0 seeks

• Error : Cannot find ffmpeg in firebase cloud function

  6 novembre 2024, par Ahmed Wagdi

  i'm trying to compress some uploaded files to firebase storage .. using firebase cloud functions but it give me the error Error: Cannot find ffmpeg

  


  here is my function :

  


  const functions = require("firebase-functions");
const admin = require("firebase-admin");
const ffmpeg = require("fluent-ffmpeg");
const ffmpegStatic = require("ffmpeg-static");
const axios = require("axios");

// const {onSchedule} = require("firebase-functions/v2/scheduler");

admin.initializeApp();

// Ensure fluent-ffmpeg uses the binary
ffmpeg.setFfmpegPath(ffmpegStatic.path);

const db = admin.firestore();
const bucket = admin.storage().bucket();
const fs = require("fs");
const downloadVideo = async (url, outputPath) => {
  const response = await axios.get(url, {responseType: "stream"});
  const writer = fs.createWriteStream(outputPath);
  response.data.pipe(writer);
  return new Promise((resolve, reject) => {
    writer.on("finish", () => resolve(outputPath));
    writer.on("error", reject);
  });
};

const compressVideo = (videoFullPath, outputFileName, targetSize) => {
  return new Promise((resolve, reject) => {
    ffmpeg.ffprobe(videoFullPath, (err, metadata) => {
      if (err) return reject(err);
      const duration = parseFloat(metadata.format.duration);
      const targetTotalBitrate =
      (targetSize * 1024 * 8) / (1.073741824 * duration);

      let audioBitrate =
      metadata.streams.find((s) => s.codec_type === "audio").bit_rate;
      if (10 * audioBitrate > targetTotalBitrate) {
        audioBitrate = targetTotalBitrate / 10;
      }

      const videoBitrate = targetTotalBitrate - audioBitrate;
      ffmpeg(videoFullPath)
          .output(outputFileName)
          .videoCodec("libx264")
          .audioCodec("aac")
          .videoBitrate(videoBitrate)
          .audioBitrate(audioBitrate)
          .on("end", resolve)
          .on("error", reject)
          .run();
    });
  });
};

const uploadVideoWithResumableUpload = (filePath, destinationBlobName) => {
  const blob = bucket.file(destinationBlobName);
  const options = {resumable: true, validation: "crc32c"};
  return blob.createWriteStream(options).end(fs.readFileSync(filePath));
};

exports.processLessonsOnDemand =
functions.https.onRequest({timeoutSeconds: 3600, memory: "2GB"}
    , async (context) => {
      console.log("Fetching lessons from Firestore...");
      const lessonsRef = db.collection("leassons");
      const lessonsSnapshot = await lessonsRef.get();

      if (lessonsSnapshot.empty) {
        console.log("No lessons found in Firestore.");
        return; // Exit if no lessons are available
      }

      const lessonDoc = lessonsSnapshot.docs[0]; // Get the first document
      const lessonData = lessonDoc.data();

      if (lessonData.shrinked) {
        console.log(
            `Skipping lesson ID ${lessonDoc.id} as it's already shrunk.`,
        );
        return; // Exit if the first lesson is already shrunk
      }

      const videoURL = lessonData.videoURL;
      if (!videoURL) {
        console.log(
            `No video URL for lesson ID: ${lessonDoc.id}. Skipping...`,
        );
        return; // Exit if no video URL is available
      }

      const tempVideoPath = "/tmp/temp_video.mp4";

      try {
        await downloadVideo(videoURL, tempVideoPath);

        const targetSize = (fs.statSync(tempVideoPath).size * 0.30) / 1024;
        const outputCompressedVideo = `/tmp/compressed_${lessonDoc.id}.mp4`;

        await compressVideo(tempVideoPath, outputCompressedVideo, targetSize);

        await uploadVideoWithResumableUpload(
            outputCompressedVideo,
            `compressed_videos/compressed_${lessonDoc.id}.mp4`,
        );

        const newVideoURL = `https://storage.googleapis.com/${bucket.name}/compressed_videos/compressed_${lessonDoc.id}.mp4`;

        const oldVideoPath = videoURL.replace(`https://storage.googleapis.com/${bucket.name}/`, "");
        const oldBlob = bucket.file(oldVideoPath);
        await oldBlob.delete();

        await lessonsRef.doc(lessonDoc.id).update({
          videoURL: newVideoURL,
          shrinked: true,
        });

        console.log(`Processed lesson ID: ${lessonDoc.id}`);
        fs.unlinkSync(tempVideoPath); // Clean up temporary files
        fs.unlinkSync(outputCompressedVideo); // Clean up compressed file
      } catch (error) {
        console.error(`Error processing lesson ID ${lessonDoc.id}:`, error);
      }
    });