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• do uploaded files to lambda persist ?

  24 novembre 2023, par Sam Leurs

  I have a node.js function where users kan upload a video file. The video file is uploaded to an S3-bucket. I have a lambda function which listens to the bucket for every upload. Every video that gets uploaded, gets converted via ffmpeg and stored into another bucket, and the original file is deleted.

  


  I messed around with ffmpeg in lambda, quiet difficult. I now have it working, but there is one problem : I'm using fluent-ffmpeg, and streaming data in and out from a bucket doesn't work.

  


  This is my code :

  


  promise...
ffmpeg().input(`https://s3.eu-central-1.amazonaws.com/mybucket.mywebsite.com/${key}`)
        .addInputOption('-analyzeduration 100M')
        .addInputOption('-probesize 100M')
        .toFormat('mp4')
        .addOutputOption("-preset veryfast")
        .addOutputOption("-movflags frag_keyframe+empty_moov")
        .addOutputOption("-crf 28")
        .output('/tmp/output.mp4')
        .on('error', (err, stdout, stderr) => {
            console.log(err);
            console.log('Stdout: %o', stdout);
            console.log('Stderr: %o', stderr);
            reject(err);
        })
        .on('end', () => {
          resolve();
        });
.run();


  


  As you can see, as an input file, I directly read the url of the video file. I wanted to create a readstream (I do this with images), but that didn't work.

  


  I temporary store the created video file as /tmp/output.mp4. After the code is done, I do this :

  


  await putObjectToS3(process.env.MY_NEW_BUCKET, newKey, '/tmp/output.mp4', mimeType);


  


  This works.

  


  My question now is : when the lambda function is done, what happens with the file in /tmp/output.mp4 ? Is it deleted, or is it stored somewhere until I deleted it. I don't need it anymore so I don't want to pay for the storage of it.

  


  Thanks in advance.

  


• FFmpeg with m3u8 playlist : Invalid data found when processing input [closed]

  15 mai 2023, par anthnyprschka

  I get the following error when I try to open a playlist with FFmpeg :

  


  ffmpeg version 2023-03-05-git-912ac82a3c-essentials_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      58.  3.100 / 58.  3.100
  libavcodec     60.  6.100 / 60.  6.100
  libavformat    60.  4.100 / 60.  4.100
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  4.100 /  9.  4.100
  libswscale      7.  2.100 /  7.  2.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
playlist.m3u8: Invalid data found when processing input


  


  Command I use :

  


  ffmpeg [-allowed_extensions ALL] -i playlist.m3u8 -c copy playlist.mp4


  


  Playlist file :

  


  #EXTM3U
#EXTINF:-1,0
https://20230515.s3.eu-central-1.amazonaws.com/output0000f.mp4
#EXTINF:-1,1
https://20230515.s3.eu-central-1.amazonaws.com/output0001f.mp4
#EXTINF:-1,2
https://20230515.s3.eu-central-1.amazonaws.com/output0002f.mp4


  


  The playlist plays fine in VLC player

  


• Is it a way to seek videos faster with ffmpeg while applying some filters ?

  21 mars 2023, par Peter.k

  I use parameters to cut a fragment from a video which in normal circumstances works well, but when I apply some filters, which may cause processors to be a bit busy, the seeking method seems to work very long. For example :

  


  ffmpeg -i "i:\longmovie.mp4" -vf "subtitles=longmovie.srt:force_style='FontName=Central European Time 13\:37,FontSize=20,PrimaryColour=&H00171771,OutlineColour=&HFFFFFFFF,BorderStyle=4,BackColour=&H33FFFFFF,Outline=5,Shadow=0,MarginV=10'" -b:v 1000k -ss 02:01:54.0 -to 02:02:13.0 -preset ultrafast e:/tt147+3.mp4


  


  I put those -ss and -to parameters at the end of the command, because it doesn't work in other places. It either produces very long video or skips the whole filter.

  


  Can I use some trick to make it faster. The problem is in jumping to the desired 02:01:54 time - the rest works ok.