[FFmpeg-user] Seeking a more detail explanation of err_detect options

[Richard Bartczak]

Am 30.05.25 um 14:20 schrieb Grilled Tanuki:
> Hi all,
>
> I am writing some software to parse through a repository of videos to
> detect encoding errors that would result in a visual or audible glitch. I'm
> not concerned about minor issues that a decoder can handle gracefully. I
> have been using the following command.
>
> FFMPEG_PATH -xerror -err_detect ERROR_DETECT -loglevel error -hwaccel cuda
> -hwaccel_output_format cuda -i FILE_PATH -f null -
>
> The documentation for err_detect lists the following options.
>
> crccheck - verify embedded CRCs
> bitstream - detect bitstream specification deviations
> buffer - detect improper bitstream length
> explode - abort decoding on minor error detection
> ignore_err - ignore decoding errors, and continue decoding.
> careful - consider things that violate the spec and have not been seen in
> the wild as errors
> compliant - consider all spec non compliances as errors
> aggressive - consider things that a sane encoder should not do as an error
>
> I have been using explode, however this fails on inconsequential errors
> where the video still plays through fine. I want to switch to an option
> that should only flag noticeable glitches, but the documentation on the
> options is brief and vague to me. Does anyone have any insight on what
> these options do and could give me a more detailed description?
>
> Thanks
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I use another way to find corrupted frames, the decoding analysis of 
libx264 :

#!/bin/bash

while IFS= read -r -d $'\0' video
do
     filename=$(basename -- "$video")
     filename="${filename%.*}"

     ffmpeg -y -i "$video" -vcodec libx264 -crf 51 -preset ultrafast 
-acodec copy -f mp4 -movflags frag_keyframe+empty_moov+delay_moov pipe:1 
 >/dev/null 2>"${filename}.txt" </dev/null
     TxtFileName="${filename}.txt"
     mystring=${TxtFileName}
     echo $mystring
     grep -i -n 'error\|duplicate\|failure\|missing\|POCs\|corrupt' 
"${TxtFileName}"
     echo "Ready"

done < <(find -iregex ".*\.\(mp4\|mkv\|m2ts\|mpg\|ts\)" -print0)
echo "Ready"
read pause

Refer to the "grep" line, only the failure indication, leads sometimes 
to not visible "errors".

The script will generate a txt-file, same name as the videio, with the 
respective error indication and the timestamp.

Best regards

Richard