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• How can I make windows "like" the mp4 files I create in Linux and sync with Rsync

  17 juillet 2019, par Geoff Fox

  I am a meteorologist on TV remotely from a studio I built. My control room uses a TriCaster, an amazing studio-in-a-box which runs on a Windows 7 variant. I make my weather maps myself on a Centos 7 machine — around 40,000/day.

  I don’t entirely understand the problem, but here’s a quote from someone helping me at NewTek (the TriCaster company)

  Rsync is built on a *nix based environment where all the file permissions and attributes are based on the Linux environment. There is no meaning for this in NTFS and Windows. The result is you get files that will most likely have the read-only flag set or no flag at all. Other attributes will be delivered as null. I’m sure from your own programming experience, programs don’t like null values and they generally have to be accounted for very specifically.

  And so the finely tuned TriCaster stumbles, meaning lost frames or other problems caused by my short weather animations.

  Here are some samples of the Rsync code I use

  rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/conus*.mp4 /mnt/tricaster/Clips/Import
rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/nebraska*.mp4 /mnt/tricaster/Clips/Import
rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/northernplains*.mp4 /mnt/tricaster/Clips/Import

  These are mp4 files. They are only used locally. I really don’t care what flags are checked and permissions filled as long as Windows 7 doesn’t care.

  At this point I always like to tell folks, though I do write some code my last computer class was in high school,’67-68 semester. Thanks in advance for your help.

• Impossible to redirect video stream after conversion (mkv to mp4)

  17 décembre 2019, par elgrusko

  I’m currently realising a school project which aims a streaming video website (like Netflix) using torrent-stream (with the magnet link). I am using NodeJS for the stream part.

  My problem is : I can’t redirect the stream to the HTML 5 player while i’m trying to stream and converting (with ffmpeg) video at the same time. I think it’s because I just can’t know what’s will be the final size of the converted file.
  In browser’s console I have this message : net::ERR_CONTENT_LENGTH_MISMATCH 200 (OK)

  I tried to put this in the header : Transfer-Encoding: chunked instead of Content-Length
  I specify that the stream (before conversion) works perfectly

  This is my code :

  getTorrentFile.then(function (file) {
  
                  res.setHeader('Content-Type', 'video/mp4');
  
                  res.setHeader('Content-Length', file.length);
  
                  const ranges = parseRange(file.length, '15' /* variable à comprendre */, { combine: true });
  
                  console.log(ranges);
  
                  if (ranges === -1) {
  
                      // 416 Requested Range Not Satisfiable
  
                      console.log('416')
  
                      res.statusCode = 416;
  
                      return res.end();
  
                  } else if (ranges === -2 || ranges.type !== 'bytes' || ranges.length > 1) {
  
                      // 200 OK requested range malformed or multiple ranges requested, stream ent'ire video
  
                      if (req.method !== 'GET') return res.end();
  
                      console.log('200')
  
                      stream = file.createReadStream()
  
                      ffmpeg(stream)
  
                      .videoCodec('libx264')
  
                      .audioCodec('aac')
  
                      .output(res)
  
                      .output('./video/' + film + '_s' + season + '_e' + episode + '.mp4')
  
                      .outputFormat('mp4')
  
                      .outputOptions('-movflags frag_keyframe+empty_moov')
  
                      .on('error', function(err) {
  
                          console.log('An error occurred: ' + err.message);
  
                      })
  
                      .on('progress', function(progress) {
  
                          console.log('Processing: ' + progress.targetSize + 'kb done');
  
                        })
  
                      .on('end', function() {
  
                          console.log('Processing finished !');
  
                      })
  
                      .addOutputOption('-acodec')
  
                      .run()

  Sorry if i’m not really clear, ask me some questions if you need more informations :)

  Thanks for your help, bye :)

• Low FPS output using ffmpeg and a raspi camera

  23 novembre 2019, par Newe

  I am building a surveillance camera for a school project, which is based on a raspberry pi and a infrared raspberry Pi camera.

  I am capturing the camera’s video stream and outputting it as an HLS stream directly from ffmpeg. However, the resulting video is really low fps ( 5 at max)

  Strangely, raspivid manages to ouput a 60fps 720p stream without any problem, but when put through ffmpeg for streaming, the video is cropped in half and i cannot get it to show up entirely.

  Here is the ffmpeg command i use :

  #!/bin/bash
  
  ffmpeg -v verbose \
  
  -re \
  
  -i /dev/video0 \
  
  -c:v libx264 \
  
  -an \
  
  -f hls \
  
  -g 10  \
  
  -sc_threshold 0 \
  
  -hls_time 1 \
  
  -hls_list_size 4 \
  
  -hls_delete_threshold 1 \
  
  -hls_flags delete_segments \
  
  -hls_start_number_source datetime \
  
  -hls_wrap 15 \
  
  -preset superfast \
  
  -start_number 1 \
  
  /home/pi/serv/assets/stream.m3u8

  And the resulting log output (notice the fps)

  

  Here is the command using raspivid that i tested, based on a blog post i read :

  raspivid -n \
  
  -t 0 \
  
  -w 960 \
  
  -h 540 \
  
  -fps 25 \
  
  -o - | ffmpeg \
  
  -v verbose \
  
  -i - \
  
  -vcodec copy \
  
  -an \
  
  -f hls \
  
  -g 10 \
  
  -sc_threshold 0 \
  
  -hls_time 1 \
  
  -hls_list_size 4 \
  
  -hls_delete_threshold 1 \
  
  -hls_flags delete_segments \
  
  -hls_start_number_source datetime \
  
  -hls_wrap 15 \
  
  -preset superfast \
  
  -start_number 1 \
  
  /home/pi/serv/assets/stream.m3u8

  I am not a ffmpeg expert and am open to any suggestions that would help improve the stream’s quality and stability :)