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• Audio clicks / cracklings with ffmpeg audio recording on mac os

  15 février 2023, par Specimen

  I'm having audio clicks on my ffmpeg audio recordings. If I record with OBS for example, the audio comes out just fine. This is what I put in the terminal :

  


  ffmpeg -f avfoundation -i ":0" test.mp3


  


  where 0 is my Soundflower audio device, which I found using ffmpeg -f avfoundation -list_devices true -i "", which returns :

  


  AVFoundation audio devices:
[0] Soundflower (2ch)


  


  Soundflower, my speakers, and the ffmpeg recording are all set at 48kHz.
There is another thread that states that this may be an issue with ffmpeg version 4.3, and to try to downgrade to 4.2 ; I tried to google how to downgrade on brew, but didn't find anything.

  


• FFmpeg ignores some HTTP options when using the PUT method

  6 mars 2020, par mehdi.r

  I am using FFmpeg to create a CMAF stream and I upload it to an AWS resource (AWS MediaStore) using the PUT method of FFMpeg.
  I need to pass the Content-Type header when uploading manifests & segments.
  I have 3 type of files :

  application/x-mpegURL : m3u8 manifest

  application/dash+xml : mpd manifest

  video/mp4 : video segments

  Currently, all the types are set to Binary - octet-stream in the AWS resource (AWS MediaStore).
  As I will upload a huge number of files, I can’t use AWS Lambda functions to set the correct content type after a file as been uploaded.

  FFmpeg upload logs

  [https @ 0x555fe7a7d1c0] Opening 'https://XXXX.YYYY.amazonaws.com/chunk-stream0-00001.mp4' for writing
  
  [https @ 0x555fe7a7d0c0] request: PUT /chunk-stream0-00001.mp4 HTTP/1.1
  
  Transfer-Encoding: chunked
  
  User-Agent: Lavf/58.28.100
  
  Accept: */*
  
  Connection: keep-alive
  
  Host: XXXXX.YYYY.amazonaws.com
  
  Icy-MetaData: 1

  My tries

  I tried static builds & master branch of FFMpeg.
  I tried different ways to pass the content type, without success :

  -mime_type 1 -headers "Content-type: video/mp4\r\n"

  -mime_type "video/mp4,application/dash+xml,application/x-mpegURL"

  -content_type application/dash+xml

  -multiple_requests 1  -headers "a:b" -icy 0

  Upload command :

  ./ffmpeg -re -i ~/videos/BigBuckBunny.mp4 -loglevel debug \
  
    -map 0 -map 0 -map 0 -c:a aac -c:v libx264 -tune zerolatency \
  
    -b:v:0 2000k -s:v:0 1280x720 -profile:v:0 high -b:v:1 1500k -s:v:1 640x340  -profile:v:1 main -b:v:2 500k -s:v:2 320x170  -profile:v:2 baseline -bf 1 \
  
   -keyint_min 24 -g 24 -sc_threshold 0 -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 -window_size 5 \
  
   -adaptation_sets "id=0,streams=v id=1,streams=a" -hls_playlist 1 -seg_duration 3 -streaming 1 \
  
   -strict experimental -lhls 1 -remove_at_exit 0 -master_m3u8_publish_rate 3 \
  
   -f dash -method PUT -http_persistent 1  https://example.com/manifest.mpd

  Any help would be highly appreciated.

  Reference :
  https://www.ffmpeg.org/ffmpeg-protocols.html#http

• ffmpegmediaMetadataRetriever cannot be used for m3u8 format ?

  19 juillet 2017, par Nandz

  I want to get the frames from the video URL which is of m3u8 format. I couldn’t retrieve the frame at the specified time. When i tried with mp4 format, it worked. ( Am using android videoview)

  Here is my code.

   public class VideoViewAdapterClass extends RecyclerView.Adapter {
  
  
  
          private List<videomodelactivity> videoListModel;
  
          private Context context;
  
          public Bitmap bitmap;
  
         String videoPath = "https://xxxxxx.xxxxxx.xxxxx/HLS/xxxxxxxx/fruit_milkshake-master-playlist.m3u8";
  
  
  
          public VideoViewAdapterClass(List<videomodelactivity> videoList, Context context) {
  
              this.context = context;
  
  
  
              videoListModel = videoList;
  
  
  
          }
  
  
  
          @Override
  
          public VideoViewAdapterClass.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  
  
  
              View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(
  
                      R.layout.customized_layout, null);
  
  
  
              ViewHolder viewHolder = new ViewHolder(itemLayoutView);
  
              return viewHolder;
  
  
  
          }
  
  
  
          @Override
  
          public void onBindViewHolder(final VideoViewAdapterClass.ViewHolder holder, int position) {
  
  
  
  
  
             final VideoModelActivity videoModel = videoListModel.get(position);
  
              holder.movieName.setText(videoModel.getMovieName());
  
  
  
              MediaMetadataRetriever mediaMetadataRetriever = null;
  
  
  
              try {
  
                  mediaMetadataRetriever = new MediaMetadataRetriever();
  
                  if (Build.VERSION.SDK_INT >= 14)
  
  
  
                      mediaMetadataRetriever.setDataSource(videoPath, new HashMap());
  
                  bitmap = mediaMetadataRetriever.getFrameAtTime(2000000, MediaMetadataRetriever.OPTION_CLOSEST_SYNC);
  
  
  
  
  
              } catch (Exception e) {
  
                  e.printStackTrace();
  
  
  
              } finally {
  
                  if (mediaMetadataRetriever != null)
  
                      mediaMetadataRetriever.release();
  
              }
  
  
  
              holder.vidImg.setImageBitmap(bitmap);
  
  
  
                      holder.vidImg.setOnClickListener(new View.OnClickListener() {
  
                  @Override
  
                  public void onClick(View view) {
  
  
  
                      Intent intent = new Intent (context, VideoViewActivity.class);
  
                      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  
                      context.startActivity(intent);
  
  
  
                  }
  
              });
  
  
  
  
  
          }
  
  
  
          @Override
  
          public int getItemCount() {
  
              return videoListModel.size();
  
          }
  
  
  
          public class ViewHolder extends RecyclerView.ViewHolder {
  
  
  
              ImageView vidImg;
  
              TextView movieName;
  
              public ViewHolder(View itemView) {
  
                  super(itemView);
  
  
  
                  vidImg = (ImageView) itemView.findViewById(R.id.imageVid);
  
                  movieName = (TextView) itemView.findViewById(R.id.movieName);
  
              }
  
          }
  
      }
  
  </videomodelactivity></videomodelactivity>