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• Batch process audio files and image files to create movie files by matching multiple wildcard values

  29 septembre 2022, par psychaudio

  I'm attempting to batch-process audio and image files to create video files using a Shell script with FFmpeg.

  


  

  1. The ffmpeg script works in Terminal :

  


  


  ffmpeg -loop 1 -i image.png -i audio.wav -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest output.mp4


  


  

  2. A nested for loop with wildcards works as a batch script :

  


  


  #!/bin/sh
for img in *.png; do
    for wav in *.wav; do
        ffmpeg -loop 1 -i $img -i $wav -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest ../mb/$img.mp4
    done
done


  


  The only problem here is that it creates more combinations than I need. I'd like to be able to match wildcard values and only mix those together. I'd like to be able to prepare the filenames to match in advance to make this easier : For example, only match 1.png with 1.wav to make 1.mp4, 2.png with 2.wav to make 2.mp4 and so on. I'm able to modify the script to match the wildcards in a Regex, but I'm not sure if there is a way to then execute the logic above. Here is what I am attempting :

  


  #!/bin/sh
img=*.png
wav=*.wav

if [[ ${img%.*} == ${wav%.*} ]];
    then
        ffmpeg -loop 1 -i $img -i $wav -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest $img.mp4;
    else
        echo "Failure"
    fi


  


  This begins by overwriting the image files, so it does not appear to work as planned. Is there a simpler way to do this ? Perhaps looping through images 1..5 in one folder and audio files 1..5 in another ?

  


  Thanks for any insights, and happy to provide more context (very new to this, so still learning).

  


• avcodec/vvc/intra : refact, predict jcbcr to tb->coeffs

  14 mai, par Wu Jianhua

  avcodec/vvc/intra : refact, predict jcbcr to tb->coeffs
  prepare for adaptive color transform
  Signed-off-by : Wu Jianhua <toqsxw@outlook.com>
  

  • [DH] libavcodec/vvc/dsp.h
  • [DH] libavcodec/vvc/dsp_template.c
  • [DH] libavcodec/vvc/intra.c

• Rewind problem after convert *.mp3 to *.aac

  29 août 2020, par Vitaly Vesyolko

  I need to prepare audio files in MP3 format for sending via WhatsApp to Android and iOS devices with the ability to pause and mainly rewind.

  


  To do this, I use the ffmpeg utility on my notebook with Linux Ubuntu installed. Conversion example is described in detail here FFmpeg command to convert MP3 to AAC.

  


  As a result, I get AAC audio files that cannot be rewound in the WhatsApp player. I tried to set different options that are responsible for the output sound quality, size, and so on. But the ability to rewind in the WhatsApp player disappears.

  


  Rewind - is to slide by finger the circular slider in the WhatsApp audio player widget.

  


  I also used the following online services :

  


  

  1. ONLINE-CONVERT

  


  2. Convertio

  


  3. ZAMZAR.

  


  


  One of the first two in some cases saves files with the ability to rewind, but in most cases - without it. And it very likely depends on the original file size. This is a hypothesis - if the size is small, then it is possible to rewind the audio file in the WhatsApp player. In any case, this method is not universal.

  


  Please provide a universal solution to the task at hand - a CLI utility or a tool that would convert MP3 to AAC with the ability to rewind in the WhatsApp player. And please indicate which characteristics are responsible for the absence / presence of such functionality.