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• Recommendation : Video format process NodeJS

  13 août 2022, par Austin Howard

  I am looking for the best recommendation for formatting videos ona nodejs server. In all my research i keep getting pointed back to ffmpeg but it doesnt look very friendly to a Nodejs app, i've seen fluent-ffmpeg and node-ffmpeg and a couple others, but at this point they are a couple years old, and if im going to use a node package id like for them to be udpated a bit more. Do you guys have any recommendations for current software that will be decent for converting and compressing videos for upload ? I have a use case where i sometimes have 2-3gb files that i want to get down to somewhere around 500-1gb in size. As well as generating thumbnails from that video, or if you guys have good documentation to point me to that would allow me to use the ffmpeg executable alone i can make that work too.

  


• Random Weird HLS generation with ffmpeg

  16 août 2022, par user15006279

  I am doing some live streaming setup for my personal project and I noticed that sometime ffmpeg will not generate any hls auto it was running. I copied the same command and run in shell and it was generating HLS files successfully but somehow it was not generating with nginx.

  


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  The more weird thing is that if i restart nginx for like a couple of times, it will regenerate. I am only playing youtube video from browser somehow ffmpeg process is not generating hls. Even after a couple of restarts, it will generate sometimes but its random. Mostly not generating at all. Can you guys help me with it ?

  


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• ffmpeg : remove frames when audio mute

  23 septembre 2022, par dvt

  I have a video record of a public academic conference. For some reason, the audio is complete but intermittent(spectrogram sample). For each 5 10 secs, short mute interrupts, make me hard to focus on the content.
Thinking most of the video is static image, removing mute portion of the audio and corresponding frames might be a way to fix this.

  


  For now I've partially done using silenceremove and rubberband, stripping mute interruptions and stretch the audio to the same duration of the video. Steps below :

  


  


  1. Get the video duration with ffprobe
ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 sample.mp4

     


  


  2. Try silenceremove the audio once and Get its duration.

     


     ffmpeg -i "sample.mp4" -filter_complex "[a]silenceremove=stop_periods=-1:start_threshold=-50dB:stop_threshold=-50dB:detection=rms:window=0.01[a1]" -vn sample.wav
ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 sample.mp4


     


  


  3. Calculate the tempo manually (duration-audio/duration-video), for example I got 0.948.

     


  


  4. AIO command, rubberband added. Generate a fixed version from the source.

     


     ffmpeg -i "sample.mp4" -filter_complex "[a]silenceremove=stop_periods=-1:start_threshold=-50dB:stop_threshold=-50dB:detection=rms:window=0.01[a1];[a1]rubberband=tempo=0.948" -c:v copy -cutoff 7500 sample.fix.mp4

     


  


  


  I still wonder if there is a better way. Thanks guys.

  


  Refer :

  


  

  1. How to stretch the WAV file to the same video length ?

  


  2. How to trim out black frames with ffmpeg on windows ?