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• FFmpeg : use absolute path in "metadata=print:file="

  27 octobre 2022, par Axel Herrmann

  I'm using FFmpeg to extract frames of a video and therefore I want to print the metadata of the video to a text file first (to get the scene\ value of each frame).

  


  This already works for me with something like :

  


  ffmpeg -i input.mp4 -vf "select='gte(scene,0)',metadata=print:file=scenescores.txt" -an -f null -


  


  Because I'm using all this inside of a Java application I want to pass an absolute path (of an temp directory) to print:file= instead of the currently relative one which will write it to the root directory of the project.

  


  But when I try to specify an absolute path like D:\scenescores.txt I get the following error :

  


  [metadata @ 00000203282ff0c0] Unable to parse option value "scenescores.txt" as boolean
[metadata @ 00000203282ff0c0] Error setting option direct to value scenescores.txt.
[Parsed_metadata_1 @ 00000203269bdf00] Error applying options to the filter.
[AVFilterGraph @ 0000020328020840] Error initializing filter 'metadata' with args 'print:file=D:\scenescores.txt'


  


  Is there any way to achieve printing to an absolute path ? Am I missing some escape rules or something ?

  


• Why does Bash eat the first letter from every second line of input when redirecting ffmpeg stderr to stdout ? [duplicate]

  15 avril 2023, par Tomasz

  When I run the following code, that is supposed to print out the filename and redirect ffmpeg's stderr information to stdout :

  


  #!/bin/bash

while read -r filename; do
  echo $filename
  cmd_out=$(ffmpeg -i "$filename" -f null - 2>&1)
done < inputs.txt


  


  With the following inputs.txt :

  


  intro.mp3
silence.mp3
outro.mp3
intro2.mp3


  


  I get

  


  intro.mp3
ilence.mp3
outro.mp3
ntro2.mp3


  


  Notice the first letter of the filename is missing in both the 2nd and 4th lines.

  


  This happens only if the inputs.txt entries are existing audio files, and ffmpeg is used.

  


• Can we provide a raw stream of microphone data Unit8List as a Input to ffmpeg and save the output file as .wav or .mp3

  21 juillet 2023, par Uday

  The goal is to listen to a live microphone stream (don't want to store it locally)and try to pass it to the RTSP server or to a .mp3 or .wav file locally.

  


  FFmpeg lib :ffmpeg_kit_flutter

  


  Mic Stream lib : https://pub.dev/packages/mic_stream

  


   stream = await MicStream.microphone(
        audioSource: AudioSource.DEFAULT,
        sampleRate: 44100,
        channelConfig: ChannelConfig.CHANNEL_IN_STEREO,
        audioFormat: AudioFormat.ENCODING_PCM_16BIT);

listener = stream!.listen((recordedData) async {
  await processData(recordedData);
});


  


  And in Process data, I want to convert this raw Unit8List data to .mp3 or transmit it to rtsp server live.

  


  any of the commands i want to execute

  


  Future<void> processData(Uint8List data) async {&#xA;//var command = &#x27;-i "$data" -f rtsp -rtsp_transport tcp -y "$RtspUrl"&#x27;;&#xA;&#xA;&#xA;//var command = &#x27;-i "$data" "/storage/emulated/0/Download/androidvideo.mp3"&#x27;;&#xA;&#xA;FFmpegKit.execute(command).then((session) async {&#xA;  final returnCode = await session.getReturnCode();&#xA;  final logs = await session.getLogs();&#xA;  for (var element in logs) {&#xA;    print(&#x27;logs:${element.getMessage()}&#x27;);&#xA;  }&#xA;  if (ReturnCode.isSuccess(returnCode)) {&#xA;    print(&#x27;Command execution completed successfully.&#x27;);&#xA;  } else if (ReturnCode.isCancel(returnCode)) {&#xA;    print(&#x27;Command execution completed CANCEL.&#x27;);&#xA;    listener.cancel();&#xA;  } else {&#xA;    print(&#x27;Command execution completed ERROR.&#x27;);&#xA;    listener.cancel();&#xA;  }&#xA;});&#xA;}&#xA;</void>