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• typeError when using ffmpeg with buffer in NodeJS ["argument must be of type string or an instance of Buffer"]

  16 mars 2021, par coolps811

  I am trying to covert buffer data into the correct mp4 video format. However I am getting an error : "UnhandledPromiseRejectionWarning : TypeError [ERR_INVALID_ARG_TYPE] : The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of FfmpegCommand". How can I fix this ?

  


  router.post("/download", (req, res, next) => {
  axios({
    method: "get",
    url: req.body.url,
    responseType: "arraybuffer",
  }).then(function (response) {
    const data = new Uint8Array(Buffer.from(response.data));

    const proc = new ffmpeg(data)
      .videoCodec("libx264")
      .outputOptions(["-movflags isml+frag_keyframe"])
      .toFormat("mp4")
      //.seekInput(offset) this is a problem with piping
      .on("error", function (err, stdout, stderr) {
        console.log("an error happened: " + err.message);
        console.log("ffmpeg stdout: " + stdout);
        console.log("ffmpeg stderr: " + stderr);
      })
      .on("end", function () {
        console.log("Processing finished !");
      })
      .on("progress", function (progress) {
        console.log("Processing: " + progress.percent + "% done");
      });

    fs.writeFile("Assets/test.mp4", proc, callback);
  });

  const callback = (err) => {
    if (err) throw err;
    console.log("It's saved!");
  };
});


  


• Filtering string for hidden character when read from file in bash [duplicate]

  19 mai 2021, par BharathYes

  I am writing a bash script to trim video file into small pieces and finally merge them into a single video file using ffmpeg based on specified time.

  


  #!/bin/bash

filename="$1"
linecount=`wc -l "${filename}.txt"`
echo -n "" > to-merge.list

# file split by time
count=0
IFS=''
while read -r fromTime ; read -r toTime; do
    echo "$fromTime and $toTime done"
    ffmpeg -i "${filename}.mp4" -ss $fromTime -to $toTime -c copy "${filename}_pt_${count}.mp4"
    echo "file '${filename}_pt_${count}.mp4'" >> to-merge.list
    count=$((count+1))
done < "${filename}.txt"

# file merge
`ffmpeg -f concat -safe 0 -i to-merge.list -c copy "${filename}-trimmed.mp4"`


  


  The input file contains time (odd lines are taken as start time and even as the end time). A file I use is :

  


  00:00:00
00:39:34
00:39:38
01:23:14
01:23:16
02:03:45
02:03:48
02:43:43


  


  ---

  


  problem faced

  


  The echo in while loop prints this : done02:03:45

  


  The overwriting makes me think the time stored in the variables must contain a special character at the end that makes it invalid in ffmpeg.
ffmpeg throws this error : Invalid duration specification for ss: 01:23:16

  


  Is there a way to cleanup the time variable ?

  


  I have tried to find what is causing this issue or how to get rid of it but drawing a blank.

  


  ---

  


  what I have tried so far

  


  use grep -Eo '[0-9]{1,2}:[0-9]{1,2}:[0-9]{1,2}' to find time. While this works on the shell I am unable to use it in the script.

  


  Tried splitting time by : into hour, min and sec and saving them into an array to then merge them back but this makes it unnecessarily complicated and error prone.

  


  PS :
Is while read to be preferred for reading multiple lines like here or should tools like sed be used for best practice ? Such as sed '2,4 !d' /tmp/test.txt ?

  


• avcodec/bsf : switch to av_get_token to parse bsf list string

  3 juillet 2021, par Gyan Doshi

  avcodec/bsf : switch to av_get_token to parse bsf list string
  The recently added setts bsf makes use of the eval API whose
  
  expressions can contain commas. The existing parsing in
  
  av_bsf_list_parse_str() uses av_strtok to naively split
  
  the string at commas, thus preventing the use of setts filter
  
  with expressions containing commas.
  av_get_token can work with escaped commas, allowing full use of setts.
  

  • [DH] libavcodec/bsf.c