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• ffmpeg can't find codec to cut 10 seconds movie

  19 novembre 2017, par Logan

  I tried to cut 10 seconds from movie and convert to MP4. But sometimes I have a error like below :

  Duration: 00:08:52.40, start: 0.000000, bitrate: 1126 kb/s
  
      Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp, 96 kb/s
  
      Stream #0:1: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 640x480, 1000 kb/s, SAR 1:1 DAR 4:3, 29.97 tbr, 1k tbn, 1k tbc
  
  [mp4 @ 0x5614bbea1300] Could not find tag for codec wmv3 in stream #0, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argumentStream mapping:

  What does this error mean ? Should I install some extra codec ?

  My exec line looks like :

  ffmpeg -i input.wmv -ss 00:00:00 -to 0 -c copy 0:00:10 output.mp4

• How can start a process and stop the process if "error" string appear in the console output strings in one line commands set

  25 janvier 2018, par Thm Lee

  Now I want one line cmd commands set which start a process and monitor the consol output strings stream. And so if error message appear in the process’s console output, then could stop the process immediately.

  For example, I tried below commends sets, but failed. It seems find command didn’t get any strings streams in which search key word "error"

  ffmpeg "endcoding process options set" | find "error" && exit

  or,

  ffmpeg "endcoding process options set" 2>&1 find "error" && exit

  Is there any solutions about this ?

  Thanks in advance

• awkward behaviour in bash find-loop with ffmpeg

  25 avril 2018, par Alexander

  There is something weird going on when running following script with Docker.

  The dockerfile for this is :

  FROM debian:9
  
  WORKDIR /app
  
  RUN apt-get -y update && \
  
      apt-get -y install ffmpeg curl
  
  COPY . /app

  The script run.sh :

  #!/bin/bash
  
  find /pfs/in -maxdepth 1 -name "*.flac" -print0 | while IFS= read -r -d $'\0' inFile; do
  
      echo "\n##### Process '${inFile}' #####"
  
      ffmpeg -y -i ${inFile} -ar 16000 tmp.wav # use 16kHz - default for EML
  
  done

  Starting this, when mounting 3 files into the container :

  $ ls pfs/in/
  
  Testaudio16k_2.flac  Testaudio16k.flac  Testaudio16k.wav  TestSprache_Saetze.flac
  
  $ docker run --rm -t -v $(pwd)/pfs/in:/pfs/in test-img:latest /bin/bash run.sh

  I get an error on processing the second file : pfs/in/Testaudio16k_2.flac: No such file or directory. The leading / is missing. It is also missing in the preceeding echo. Indeed this happens every second file (if I put more than 3 files in that folder).

  Now coming to the counter example :
  If I comment out the ffmpeg line in the script, rebuild and run, The echo prints for every file the correct path.

  Does anybody have an idea about this ?
  Is it about the find or is the ffmpegdoing something weird ? Something completely different ?