Recherche avancée

Sur d’autres sites (8689)

• ffmpeg not working with filenames that have whitespace

  18 mai 2021, par cmw

  I'm using FFMPEG to measure the duration of videos stored in an Amazon S3 Bucket.

  


  I've read the FFMPEG docs, and they explicitly state that all whitespace and special characters need to be escaped, in order for FFMPEG to handle them properly :

  


  See docs 2.1 and 2.1.1 : https://ffmpeg.org/ffmpeg-utils.html

  


  However, when dealing with files whose filenames contain whitespace, ffmpeg fails to render a result.

  


  I've tried the following, with no success

  


  ffmpeg -i "http://s3.mybucketname.com/videos/my\ video\ file.mov" 2>&1 | grep Duration | awk '{print $2}' | tr -d
ffmpeg -i "http://s3.mybucketname.com/videos/my video file.mov" 2>&1 | grep Duration | awk '{print $2}' | tr -d
ffmpeg -i "http://s3.mybucketname.com/videos/my'\' video'\' file.mov" 2>&1 | grep Duration | awk '{print $2}' | tr -d
ffmpeg -i "http://s3.mybucketname.com/videos/my\ video\ file.mov" 2>&1 | grep Duration | awk '{print $2}' | tr -d


  


  However, if I strip out the whitespace in the filename – all is well, and the duration of the video is returned.

  


• Strange behavior about ”ls | while read" with ffmpeg in shell script [duplicate]

  13 décembre 2018, par user3288408

  This question already has an answer here :

  • execute ffmpeg command in a loop
    
    3 answers
    

  I created a shell script to convert all wave files to mp3 files. I use Ubuntu 18.04, FFmpeg was installed using apt, and I run my script in bash.

  My script :

  #!/bin/bash
  
  
  
  ls *.wav | while read file
  
  do
  
      echo $file
  
      ffmpeg -i "$file" -codec:a libmp3lame -b:a 192k "${file%.*}.mp3"
  
  done

  The target files are followings : (include space characters. The real filenames are longer, but I simplified the filenames. Also in this case, the problem occurs)

  % ls *.wav
  
  '01 A.wav'  '02 A.wav'  '03 A.wav'

  The problem is that sometimes $file in the loop is blank or a part of filename strangely (’echo $file’ shows that), and ffmpeg says ’[broken filename] : No such file or directory’. I confirmed the following things.

  • When I comment out the ffmpeg line, ’echo’ shows what I expected. ($file not broken)
  • When I replace ffmpeg to a similar command like ’lame’, it works. ($file not broken)
  • When I replace ’ls *.wav | while read file’ to ’for file in *.wav’, it works. ($file not broken)

  So, only when I use combination of ’ls’ and ’ffmpeg’, $file is broken. What’s going on ? Or do I misunderstand something ?

• cbs_h2645 : Avoid memcpy when splitting fragment

  21 novembre 2018, par Andreas Rheinhardt

  cbs_h2645 : Avoid memcpy when splitting fragment
  Now memcpy is avoided for NAL units that don't contain 0x03 escape
  
  characters.
  Improves performance of cbs_h2645_fragment_add_nals from 36940
  
  decicycles to 6364 decicycles based on 8 runs with a 5.1 Mb/s H.264
  
  sample (262144 runs each).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@googlemail.com>
  
  Signed-off-by : Mark Thompson <sw@jkqxz.net>
  

  • [DH] libavcodec/cbs_h2645.c
  • [DH] libavcodec/h2645_parse.h