[FFmpeg-user] way to reencode corrupted video

[Bouke / Videotoolshed]

Hi Glenn,
Windows version had an update, it now also can save views (you can change the order / width / visibility of columns and save that.)

Here is a serial:
ALE-1TSQ-4064-2344-2395


Bouke

videotoolshed.com
Van Oldenbarneveltstraat 33
6512 AS Nijmegen, the Netherlands
+31 6 21817248
If you want to send me large files, please use:
https://videotoolshed.wetransfer.com/

> On 26 Feb 2025, at 00:10, Richard Bartczak via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:
> 
> There are fatal errors in the stream.
> 
> I did check it with a script (Linux) :
> 
> ---
> 
> frame=    8 fps=0.0 q=40.0 size=       0kB time=00:00:01.13 bitrate=  
> 0.0kbits/s dup=21 drop=0 speed=12.8x
> frame=   26 fps=0.0 q=49.0 size=       0kB time=00:00:01.83 bitrate=  
> 0.0kbits/s dup=21 drop=0 speed=3.07x
> frame=   69 fps= 62 q=49.0 size=       0kB time=00:00:03.56 bitrate=  
> 0.0kbits/s dup=21 drop=0 speed=3.18x
> frame=  120 fps= 74 q=50.0 size=       0kB time=00:00:05.61 bitrate=  
> 0.0kbits/s dup=21 drop=0 speed=3.46x
> frame=  167 fps= 79 q=49.0 size=       0kB time=00:00:07.48 bitrate=  
> 0.0kbits/s dup=21 drop=0 speed=3.52x
> frame=  209 fps= 79 q=49.0 size=       0kB time=00:00:09.15 bitrate=  
> 0.0kbits/s dup=21 drop=0 speed=3.46x
> frame=  260 fps= 83 q=48.0 size=     368kB time=00:00:11.20 bitrate=
> 269.2kbits/s dup=21 drop=0 speed=3.56x
> frame=  309 fps= 84 q=49.0 size=     368kB time=00:00:13.16 bitrate=
> 229.1kbits/s dup=21 drop=0 speed=3.58x
> frame=  354 fps= 85 q=49.0 size=     368kB time=00:00:14.95 bitrate=
> 201.6kbits/s dup=21 drop=0 speed=3.58x
> [h264 @ 0x574eb5937540] cabac decode of qscale diff failed at 59 6
> [h264 @ 0x574eb5937540] error while decoding MB 59 6, bytestream 77049
> [h264 @ 0x574eb5937540] concealing 7430 DC, 7430 AC, 7430 MV errors in P
> frame
> [NULL @ 0x574eb57c9700] Invalid NAL unit size (60897492 > 110161).
> [NULL @ 0x574eb57c9700] missing picture in access unit with size 110165
> [h264 @ 0x574eb594b680] Invalid NAL unit size (60897492 > 110161).
> [h264 @ 0x574eb594b680] Error splitting the input into NAL units.
> [NULL @ 0x574eb57c9700] Invalid NAL unit size (-1600997495 > 84591).
> [NULL @ 0x574eb57c9700] missing picture in access unit with size 84595
> [NULL @ 0x574eb57c9700] Invalid NAL unit size (1695808648 > 76726).
> [NULL @ 0x574eb57c9700] missing picture in access unit with size 76730
> [h264 @ 0x574eb588c480] Invalid NAL unit size (-1600997495 > 84591).
> [h264 @ 0x574eb588c480] Error splitting the input into NAL units.
> [h264 @ 0x574eb58a0380] Invalid NAL unit size (1695808648 > 76726).
> [h264 @ 0x574eb58a0380] Error splitting the input into NAL units.
> [NULL @ 0x574eb57c9700] Invalid NAL unit size (540206825 > 109538).
> [NULL @ 0x574eb57c9700] missing picture in access unit with size 109542
> [h264 @ 0x574eb57e40c0] Invalid NAL unit size (540206825 > 109538).
> [h264 @ 0x574eb57e40c0] Error splitting the input into NAL units.
> [NULL @ 0x574eb57c9700] Invalid NAL unit size (1072494654 > 74994).
> [NULL @ 0x574eb57c9700] missing picture in access unit with size 74998
> [h264 @ 0x574eb5844d00] Invalid NAL unit size (1072494654 > 74994).
> [h264 @ 0x574eb5844d00] Error splitting the input into NAL units.
> [vist#0:0/h264 @ 0x574eb57cfe00] corrupt decoded frame
> [vist#0:0/h264 @ 0x574eb57cfe00] Error submitting packet to decoder:
> Invalid data found when processing input
>     Last message repeated 4 times
> 
> frame=  392 fps= 84 q=49.0 size=     368kB time=00:00:16.51 bitrate=
> 182.6kbits/s dup=26 drop=0 speed=3.53x
> frame=  436 fps= 84 q=49.0 size=     368kB time=00:00:18.28 bitrate=
> 164.9kbits/s dup=26 drop=0 speed=3.53x
> 
> ---
> 
> 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
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