[FFmpeg-user] way to reencode corrupted video

[BloodMan]

OK,

It's not a ffmpeg-only one-liner but it gets the job done :)
Thank You Richard.


W dniu 2025-02-26 o 00:10, Richard Bartczak via ffmpeg-user pisze:
> There are fatal errors in the stream.
> 
> I did check it with a script (Linux) :
> ---
> [...]
> ---
> It leads to the missing audio after this error.
> This error must be removed to reencode :
> ffmpeg -i "test.mp4" -codec copy -ss 00:00:00.000 -t 00:00:14.950
> "test1.mp4"
> ffmpeg -i "test.mp4" -codec copy -ss 00:00:16.510 -t 00:00:50.080
> "test2.mp4"
> But to "cat" the files via ffmpeg, all errors must be removed :
> All mp4 files of the directory will be "cat"
> ffmpeg -safe 0 -f concat -i <(printf "file '$PWD/%s'\n" *.mp4) -c copy
> test.mp4
> But with Avidemux you can ad all videos per drag + drop, after all, save
> the files in copy mode to one-mp4 and reencode as you wish.
> The script to get all errors with the respective timestamp :
>
> #!/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)
> #dos2unix -c mac "${TxtFileName}"
> #grep -C 5 -i -n 'error\|duplicate\|failure' "${TxtFileName}"
> echo "Ready"
> read pause
> 
> All video files of the directory will be checked, the result you will
> find in the txt-file.
> Regards

> Am 25.02.25 um 03:02 schrieb BloodMan:
>> Hello,
>>
>> wetransfer mp4 test file: https://we.tl/t-BJKuiAHTKQ
>>
>> The video plays using VLC with glitches and drops (with sound until
>> the end) but reencoding generally failed (silence after the first drop).
>>
>> How to survive? How to reencode with "ignore errors like play in vlc"?
>> I tested many ffmpeg commands and tricks and nothing :/
>> Anyone?
>>
>>
>> ps. ffmpeg from git (N-118536-g4ff1d1f3d6) of course


-- 
BloodMan,