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• Facing Segmentation fault When reading video using ffmpeg, because the address of "pFormatCtx-> streams [i]-> codecpar" is 0x00

  27 février 2024, par andydy

  When reading real time video stream by using ffmpeg, pFormatCtx-> streams [i]-> codecpar is 0x00, but pFormatCtx-> streams [i]is 0x55555579bbc0.
my source code is as below where error occurs in line if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)

  



      //open media file
    if (avformat_open_input(&pFormatCtx, url, NULL, &avdic) != 0) {
        std::cout<<"can't open the file. \n";
        return;
    }

    //find the infomation of the stream
    if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {
        std::cout<<"Could't find stream infomation.\n";
        return;
    }

    //find the parameters of the video stream
    int videoStream = -1;
    cout<nb_streams<nb_streams; i++) {
        if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
            videoStream = i;
        }
    }
    if (videoStream == -1) {
        std::cout<<"Didn't find a video stream.\n"<code>

  


• When downloading HLS video with FFMPEG it does not download the audio

  3 août 2021, par Thiago Franklin

  I have a problem, when I try to download an HLS video with FFMPEG, it downloads the video track, but it doesn't find the AUDIO. When running the HLS .m3u8 file in a player, it plays normally, audio and video, but when trying to download, it shows an error message saying that the audio cannot be found.

  


  I'm running the following command :

  


  ffmpeg.exe -i "https://teste-etv.espiritismo.tv/437602.m3u8" -codec:a libmp3lame -b:a 96k teste-hls.mp3

  


  Displays the following error when trying to download the audio :

  


  [hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-INDEPENDENT-SEGMENTS')
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-1080p.m3u8' for reading
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[https @ 0000021b5e10ee00] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-720p.m3u8' for reading
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[https @ 0000021b5e10ee00] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-540p.m3u8' for reading
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[https @ 0000021b5e10ee00] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-360p.m3u8' for reading
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-1080p_00001.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-1080p_00002.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-720p_00001.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-720p_00002.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-540p_00001.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-540p_00002.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-360p_00001.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-360p_00002.ts' for reading
[hls @ 0000021b5d9ad940] Could not find codec parameters for stream 1 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[hls @ 0000021b5d9ad940] Could not find codec parameters for stream 3 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[hls @ 0000021b5d9ad940] Could not find codec parameters for stream 5 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[hls @ 0000021b5d9ad940] Could not find codec parameters for stream 7 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, hls, from 'https://appsetv.b-cdn.net/hls/437602/437602.m3u8':
  Duration: 00:01:41.00, start: 2.083333, bitrate: 0 kb/s
  Program 0
    Metadata:
      variant_bitrate : 2509173
    Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 2509173
    Stream #0:1: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Metadata:
      variant_bitrate : 2509173
  Program 1
    Metadata:
      variant_bitrate : 1205957
    Stream #0:2: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 1205957
    Stream #0:3: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Metadata:
      variant_bitrate : 1205957
  Program 2
    Metadata:
      variant_bitrate : 1165600
    Stream #0:4: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 1165600
    Stream #0:5: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Metadata:
      variant_bitrate : 1165600
  Program 3
    Metadata:
      variant_bitrate : 656245
    Stream #0:6: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 656245
    Stream #0:7: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Metadata:
      variant_bitrate : 656245
Output #0, mp3, to 'teste-hls.mp3':
Output file #0 does not contain any stream


  


• Firebase and FFmpeg : Download URL error for videos longer than one hour

  11 août 2024, par braunlich

  Summary of the problem : I'm developing a video processing feature in a React application that uses Firebase as the backend. The video file uploads to Firebase Storage without issues. However, when attempting to use FFmpeg to extract the audio as a FLAC file, the process works for videos under an hour but fails for longer videos, producing the error : "Error : File could not be read ! Code=-1".

  


  Code context : The issue occurs during the process of grabbing the video URL from Firebase Storage and extracting audio using FFmpeg. Here is the code snippet :

  


  try {
const videoDownloadURL = await getDownloadURL(uploadTask.snapshot.ref);
console.log('Video file available at', videoDownloadURL);

await ffmpeg.load();
await ffmpeg.writeFile(file.name, await fetchFile(file));
await ffmpeg.exec(['-i', file.name, '-q:a', '0', '-map', 'a', '-ac', '1', 'output.flac']); // Ensuring mono channel
const audioData = await ffmpeg.readFile('output.flac');
const audioBlob = new Blob([audioData.buffer], { type: 'audio/flac' });
const audioStorageRef = ref(storage, `${user.uid}/${videoId}.flac`);
const audioUploadTask = uploadBytesResumable(audioStorageRef, audioBlob, {
    contentType: 'audio/flac',
    customMetadata: {
        uploadedBy: user.uid,
        videoId: videoId
    }
});

audioUploadTask.on('state_changed',
    (snapshot) => {
        const audioProgress = Math.round((snapshot.bytesTransferred / snapshot.totalBytes) * 100 * 0.1);
        setUploadProgress(Math.round(videoProgress + audioProgress));
        console.log(`Audio upload progress: ${Math.round(audioProgress)}%`);
    },
    (error) => {
        console.error("Audio upload error:", error);
    },
    async () => {
        try {
            const audioDownloadURL = await getDownloadURL(audioUploadTask.snapshot.ref);
            console.log('Audio file available at', audioDownloadURL);
            audioUploadComplete = true;
        } catch (error) {
            console.error("Audio download URL error:", error);
        }
    }
);

} catch (error) { console.error("Download URL error:", error); }


  


  Issue description : The above code successfully extracts audio from videos shorter than one hour. However, for videos around two to three hours long, the code breaks with the following error message :
error code

  


  I suspect this might be related to FFmpeg or Firebase's handling of larger files, but I'm not sure how to debug this further or what adjustments to make.

  


  Research and attempts :

  


  I've confirmed that the video files are successfully uploaded to Firebase Storage.

  


  The issue appears to be related to either the FFmpeg processing or the retrieval of the download URL for larger files.

  


  I've searched for similar issues but haven't found a solution specific to handling larger video files with FFmpeg and Firebase.

  


  Request for help :

  


  Any insights on why this error might be occurring for larger files ? Suggestions for debugging or modifying the code to handle larger videos efficiently.