PotPlayer MPEG-4 opencodecUnity64 playback problem

[ThomasBlok]

I accidentally recorded some important videos with the MPEG-4 OpenCodecUnity64 codec. When playing back these files, they are unfortunately solid gray. I attempted using FFmpeg to copy video streams with re-encoding to fix these files.

ffmpeg -i Test.mkv -c:v libx264 -c:a aac output.mkv

This gives me a lot of errors:

concealing 8160 DC, 8160 AC, 8160 MV errors in P frame
[dec:mpeg4 @ 00000200a0cf01c0] corrupt decoded frame


and with transcoding:

ffmpeg -err_detect ignore_err -i Test3.mkv -c:v libx264 -c:a aac repaired-transcode.mp4

with these errors popping up:

ac-tex damaged at 36 13
Error at MB: 1609
P cbpy damaged at 65 13

Any help would be greatly appreciated!

[ProWo]

Post a mediainfo report (text mode) from this mpeg-4 mkv video here.

[ThomasBlok]

Thanks for reaching out!

The report:

General
Unique ID :
Complete name :
Format : Matroska
Format version : Version 4
File size : 23.1 MiB
Duration : 1 min 34 s
Overall bit rate : 2 049 kb/s
Frame rate : 30.000 FPS
Title : device
Writing application : PotPlayer/26.01.14
Writing library : Lavf62.8.102
ErrorDetectionType : Per level 1

Video
ID : 1
Format : MPEG-4 Visual
Format profile : Simple@L3
Format settings, BVOP : No
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : V_MPEG4/ISO/ASP
Codec ID/Info : Advanced Simple Profile
Duration : 1 min 28 s
Bit rate : 1 881 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 30.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.030
Stream size : 19.8 MiB (86%)
Writing library : XviD 73
Default : No
Forced : No

[davexnet]

SUP is a picture style of SUBS, has to be OCR'd to get editable text.
I'm out of idea's, see if some others will chime in

EDIT ooops sorry,wrong thread!

[ProWo]

Try to remux the mkv to avi

ffmpeg -i input.mkv -c copy -sn -dn output.avi

[ThomasBlok]

Appreciate the help! Unfortunately, that still produces a greyed out video.

[ProWo]

Appreciate the help! Unfortunately, that still produces a greyed out video.

The mediainfo seems fine.
You cloud try to extract the raw videostream to elaborate further:

ffmpeg -i input.mkv -vcodec copy -an -sn -dn -f rawvideo output.m4v

[ThomasBlok]

This produces a video that I can't open in a videoplayer. This is the mediainfo:


Complete name :
File size : 21.6 MiB

[ProWo]

If you upload the original not working mkv here as attachment, we could take a look.

[ThomasBlok]

I really appreciate the help! I attached a video recorded with the same settings of ~10 seconds.

[ProWo]

I've tried a few things with your sample video, but nothing has worked.
What program did you use to record it?
Can you play the file with it?

[ThomasBlok]

i have recorded it with PotPlayer, but these videos are also blank in this player. I have tried specifying the decoder to OpenCodecUnity64. This was giving me access violations.

[ProWo]

I'm afraid, your records are lost.

[ThomasBlok]

That is unfortunate, thanks for trying though!