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• Output FFMPEG segments to GCS

  28 janvier 2019, par Terrabyte

  Im trying to output an ffmpeg hls stream to google cloud storage after each segment is created or at least after the entire encoding is done. Doesn anyone know how to accomplish this ?

  This is what i have in my bash script :

  $FFMPEG -hide_banner -i "$infile" \
  
      $PASSVAR \
  
      -y \
  
      -codec:v "$VIDEO_CODEC" \
  
      -codec:a "$AUDIO_CODEC" \
  
      -threads "$NUMTHREADS" \
  
      -map 0:v \
  
      -map 0:a \
  
      -flags \
  
      -global_header \
  
      -f segment \
  
      -segment_list "$playlist_name" \
  
      -segment_time "$SEGLENGTH" \
  
      -segment_format mpeg_ts \
  
      -g "$key_frames_interval" \
  
      -keyint_min "$key_frames_interval" \
  
      $resolution \
  
      $bitrate \
  
      $FFMPEG_ADDITIONAL \
  
      $FFMPEG_FLAGS \
  
      "$OUTPUT_DIRECTORY/$output_name" | gsutil -m mv "$OUTPUT_DIRECTORY/$output_name" gs://bucket-vod-example
  
  }

  does anyone know how to output the files to gsutls as it’s being encoded ? I can make the output the mounted storage point of google cloud storage but encoding directly to it is extremely slow so if possible is there way to encode locally then transfer as it’s being encoded ?

• HTML5 video after FFmpeg compress set currentTime behavior defferent in browsers

  5 novembre 2019, par Qyellow

  i have a mp4 video(oceans.mp4), and i use ffmpeg compress itffmpeg -i oceans.mp4 output.mp4(output.mp4).

  then i open the origin in the chrome and safari, in the console, i write :

  var video = document.querySelector('video')
  
  video.currentTime = 4.68

  the video locate the same frame(at least looks the same)

  but i open the output, it looks different !

  so i do many test :

  1. it might be the broswers difference ?
     may be not. the origin video looks totally the same
  2. it might be the some props of video ?
     i use ffprobe -show_streams -select_streams v:0  output.mp4to show and compare two videos, only has_b_frames(0 and 2) and bitrates are different

  3. it might be had_b_frames ?
     ffmpeg -i oceans.mp4 -bf 0 output.mp4
     then i use the command to set it to 0, but it do not work...(sad

  4. it might be the ffmpeg’s error !(i have no idea...)

     ffmpeg -i oceans.mp4 -vcodec copy -an output_file.mp4
     i use the command only get video but delete audio...the video is corrent

  so i have no idea why the video show different... please help me

• passing additional values to s3 event notification for lambda consumption

  8 septembre 2017, par user1790300

  I have to write code in react-native that allows a user to upload videos to amazon s3 to be transcoded for consumption by various devices. For the processing after the upload occurs ; I am reviewing two approaches :

  1) I can use Lambda with ffmpeg to handle the transcoding immediately after the uploading occurs (my fear here would be the amount of time required to transcode the videos and the effect on pricing if it takes a considerable amount of time).

  2) I can have s3 pass an sns message to a rest api after the created event occurs and the rest api generate a rabbitmq message that will be processed by worker that will perform the transcoding using ffmpeg.

  Option 1) seems to be the preferable option based on a completion time perspective. How concerned should I be with using 1) considering how long video transcoding might take as opposed to option 2) ?

  Also, regardless, I need a way to pass additional parameters to lambda or along the sns messaging that would allow me to somehow associate the user who uploaded the video with their account. Is there a way to pass additional text-based values to s3 to pass along to lambda or along sns when the upload completes, as a caveat I plan to upload the video directly to s3 using the rest layer(found this answer here : http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html#RESTObjectPUT-responses-examples) ?