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• Bash script for re-encode file if re-encoded file does not already exist for all in directory

  25 octobre 2022, par steve

  I have a bash script that takes 1 argument (a file) and runs an ffmpeg command to create a duplicate of the file encoded with a different codec.

  


  #!/bin/bash

ffmpeg -i "$1" -vn -acodec aac "$(basename "${1/.wav}").aac"


  


  I just want to modify this bash script so instead of taking an argument, it instead just checks for all files in the directory to see if the re-encoded file already exists, and if it does not, creates it. Does anyone know how to do this ?

  


  Thanks for your help

  


  EDIT : the solution below is working with slight modification :

  


  #!/bin/bash

for file in ./*.wav; do
    [ -e "$file" ] || continue # check if any file exists
    if [[ ! -f "${file}.aac" ]]; then
       ffmpeg -i "${file}" -vn -acodec aac "$(basename "${file}").aac"
    fi;
done;


  


• How to run a command in python with file paths containing spaces ?

  24 juillet 2023, par tomatochan

  I'm developing a program in Python that requires the use of FFMPEG. In one step, I need to create a video from a text file containing the list of images (path and duration) that need to be assembled to make a video. To do this, I use the following code :

  


  cmd = [ffmpeg, "-y", "-f", "concat", "-safe", "0", "-i", tmp, "-c:v", "libx264", "-r", "25", "-pix_fmt", "yuv420p", out]
subprocess.run(cmd)
# os.system(" ".join(cmd)) # returns same error


  


  What returns the error : The syntax of the file, directory or volume name is incorrect.

  


  I know that paths can be problematic when they contain spaces, and as my username has one, I've taken care to quote the paths in such a way that :

  


  ffmpeg = '"C:\Users\John Doe\Documents\ffmpeg\bin\ffmpeg.exe"'
tmp = '"C:\Users\John Doe\Desktop\path\to\file.txt"'
out = '"C:\Users\John Doe\Desktop\path\to\video.mp4"'


  


  When I print(" ".join(cmd)), this is what I get in my terminal :

  


  "C:\Users\John Doe\Documentsffmpeg\binffmpeg.exe" -y -f concat -safe 0 -i "C:\Users\John Doe\Desktop\path\to\file.txt" -c:v libx264 -r 25 -pix_fmt yuv420p "C:\Users\John Doe\Desktop\path\to\video.mp4"


  


  However, the problem persists.
Has anyone ever had this problem and managed to solve it ?

  


  I've also tried the method where you have to escape the spaces (taking care to replace the \ with / and then the with \ ) but nothing works... The error persists.

  


  For your information, here are the contents of one of my .txt files

  


  file C:\Users\John Doe\Desktop\path\to\image_1.png
duration 0.04
file C:\Users\John Doe\Desktop\path\to\image_2.png
duration 0.04
file C:\Users\John Doe\Desktop\path\toimage_3.png
duration 0.04


  


  When I quote the paths in the .txt files

  


  

  • subprocess gives me the error :
PermissionError: [WinError 5] Access denied

  


  • os.system gives me the error :

  


  


  C:\Users\John' is not recognized as an internal or external command, an executable program or a command file.
The syntax of the file, directory or volume name is incorrect.


  


• ffmpeg video won't play in certain players

  25 janvier 2021, par Thomas Tiotto

  I'm generating a video in /folder/ from a stack of images in /folder/tmp/ using the following command :

  


   ffmpeg -pattern_type glob -i 'folder/tmp/*.png' -c:v libx264 -preset veryslow -crf 17 -tune stillimage -y -pix_fmt yuv420p folder/weight_evolution.mp4


  


  but my video won't play in, for example, QuickTime ("The file isn’t compatible with QuickTime Player.") and even sending it in Telegram gives really strange results. The video plays fine in IINA and VLC.

  


  As you can see, this is what is encoded by Telegram :

  


  

  


  and this is what the video should look like :

  


  

  


  The output of the command is :

  


  ffmpeg -pattern_type glob -i 'tmp/*.png' -c:v libx264 -preset veryslow -crf 17 -tune stillimage -y -pix_fmt yuv420p weight_evolution.mp4
    ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
      built with Apple clang version 12.0.0 (clang-1200.0.32.28)
      configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_7 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
      libavutil      56. 51.100 / 56. 51.100
      libavcodec     58. 91.100 / 58. 91.100
      libavformat    58. 45.100 / 58. 45.100
      libavdevice    58. 10.100 / 58. 10.100
      libavfilter     7. 85.100 /  7. 85.100
      libavresample   4.  0.  0 /  4.  0.  0
      libswscale      5.  7.100 /  5.  7.100
      libswresample   3.  7.100 /  3.  7.100
      libpostproc    55.  7.100 / 55.  7.100
    Input #0, image2, from 'tmp/*.png':
      Duration: 00:00:10.28, start: 0.000000, bitrate: N/A
        Stream #0:0: Video: png, rgba(pc), 1280x720 [SAR 3937:3937 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
    Stream mapping:
      Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
    Press [q] to stop, [?] for help
    [libx264 @ 0x7f804c009400] using SAR=1/1
    [libx264 @ 0x7f804c009400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    [libx264 @ 0x7f804c009400] profile High, level 5.0, 4:2:0, 8-bit
    [libx264 @ 0x7f804c009400] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:-3:-3 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=2.00:0.70 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-4 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.20
    Output #0, mp4, to 'weight_evolution.mp4':
      Metadata:
        encoder         : Lavf58.45.100
        Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc
        Metadata:
          encoder         : Lavc58.91.100 libx264
        Side data:
          cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    frame=   72 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   frame=  126 fps=110 q=22.0 size=       0kB time=00:00:01.68 bitrate=   0.2kbits/frame=  185 fps=112 q=22.0 size=       0kB time=00:00:04.04 bitrate=   0.1kbits/frame=  245 fps=113 q=22.0 size=       0kB time=00:00:06.44 bitrate=   0.1kbits/frame=  257 fps= 97 q=-1.0 Lsize=     209kB time=00:00:10.16 bitrate= 168.7kbits/s speed=3.83x
    video:206kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.448294%
    [libx264 @ 0x7f804c009400] frame I:2     Avg QP: 4.16  size: 92234
    [libx264 @ 0x7f804c009400] frame P:36    Avg QP:24.07  size:   156
    [libx264 @ 0x7f804c009400] frame B:219   Avg QP:26.50  size:    93
    [libx264 @ 0x7f804c009400] consecutive B-frames:  0.8%  0.0%  0.0%  1.6%  9.7% 23.3% 10.9% 18.7% 35.0%
    [libx264 @ 0x7f804c009400] mb I  I16..4: 87.5%  4.4%  8.2%
    [libx264 @ 0x7f804c009400] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.8%  0.0%  0.0%  0.0%  0.0%    skip:99.1%
    [libx264 @ 0x7f804c009400] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.3%  0.0%  0.0%  direct: 0.0%  skip:99.7%  L0:71.2% L1:28.4% BI: 0.4%
    [libx264 @ 0x7f804c009400] 8x8 transform intra:4.7% inter:22.5%
    [libx264 @ 0x7f804c009400] direct mvs  spatial:96.8% temporal:3.2%
    [libx264 @ 0x7f804c009400] coded y,uvDC,uvAC intra: 14.7% 14.6% 14.6% inter: 0.0% 0.0% 0.0%
    [libx264 @ 0x7f804c009400] i16 v,h,dc,p: 89%  2%  9%  0%
    [libx264 @ 0x7f804c009400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 40% 31%  1%  1%  1%  1%  1%  2%
    [libx264 @ 0x7f804c009400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 27% 22%  2%  2%  2%  1%  2%  2%
    [libx264 @ 0x7f804c009400] i8c dc,h,v,p: 91%  4%  3%  2%
    [libx264 @ 0x7f804c009400] Weighted P-Frames: Y:0.0% UV:0.0%
    [libx264 @ 0x7f804c009400] ref P L0: 89.1%  0.5%  4.8%  1.1%  1.5%  0.7%  0.2%  0.9%  0.2%  0.1%  0.1%  0.3%  0.1%  0.2%  0.1%  0.1%
    [libx264 @ 0x7f804c009400] ref B L0: 37.4% 17.9% 11.7%  7.0%  5.5%  5.5%  4.4%  2.0%  1.5%  1.6%  1.2%  1.9%  1.5%  0.7%  0.1%
    [libx264 @ 0x7f804c009400] ref B L1: 92.0%  8.0%
    [libx264 @ 0x7f804c009400] kb/s:163.83