MP4 Presentation Time Stamp issues need fixing?

[Tom4]

Presentation Time Stamp issues

I downloaded video from
https://robodebt.royalcommission.gov.au/
saved to mp4 using Video DownloadHelper

Loading the mp4 in Avidemux, it states:
contains B-frames, presentation time stamps
missing or monotonically increasing.

Avidemux can try reconstruct correct PTS by decoding video!

-------

The video must be kept in mp4 format.
It is saved at 240p so I need to keep as much quality as posible.
I cannot download it again.
The Downloaded mp4 240p video is over 7 hours long.

Just splitting the original downloaded mp4 into 1.2 minute segments,
they failed to upload to twitter.
My guess is the PTS issue is cause.
--------

Avidemux would only save to MKV which is not suitable for twitter.

What I need if posible:
A way to repair original mp4 PTS issues.
So I can then use lossless cut or similar to split for twitter!

How best to do?

[davexnet]

Avidemux / lower left / "output format"
You can set it to whatever you want as long as the container supports the streams

[Tom4]

Avidemux / lower left / "output format"
You can set it to whatever you want as long as the container supports the streams

Only worked to save as MKV.
It failed to work with mp4?

ATM I am recoding ?
Video Out set to - Mpeg4 AVC (x264)
Not sure what result will be like.

Is this my best option to keep original quality and file size?

[Tom4]

Original 1Gig 323kbps

The recoding ?
Video Out set to - Mpeg4 AVC (x264)
552mb 168kbps

Some loss of quality.
If no other option the recode may have to do.
Any other ideas for me to try?

[davexnet]

Not enough info. You have to hit the "configure" General Tab button and look at the settings.
For example "encoding mode" should be "control rate factor" and then below that the quality -
lower numbers produce bigger files/higher quality. Default is around 20

[Tom4]

I did not change any settings.
Just looking at this now, back in minute

[Tom4]

My fault, very sorry.
Seems I did not change bottom setting before loading video last time.
This time I changed it first, than saved as copy.
Been at this for over 12hrs and was starting to loss it.

Looks good now, new video is 1.01 Gig.
Cheers

[davexnet]

If you save with "video output" set to "copy" those settings are irrelevant since they're not used

[Tom4]

I made copy, correcting PTS and cutting segment with AVIdemux for twitter.
It still stopped at 99%.

Not sure what to do now?
Should I try recoding and cutting with AVIdemux, or would that be waste of time?
Not my area of knowledge!

[Tom4]

control rate factor 20 reduced size
from 1G 323kbps
to 552mb 168kbps

So I need to try *lower number,
Or,
Set Video Size to 1.01 Gig


Recoding also failed to make mp4 for Twitter
Thats all I know so might have to give up.

What do you surgest here?

[october262]

Avidemux / lower left / "output format"
You can set it to whatever you want as long as the container supports the streams

Only worked to save as MKV.
It failed to work with mp4?

ATM I am recoding ?
Video Out set to - Mpeg4 AVC (x264)
Not sure what result will be like.

Is this my best option to keep original quality and file size?

if you have ffmpeg installed, just run ffmpeg -i your video.mkv -c copy out.mp4
this will convert the mkv file to mp4 with no quality loss.

[Tom4]

dit dot dash

[Tom4]

The stuff about MKV was "my screw up" not setting AVIdemux to MP4 Output before loading video!

[Tom4]

Are there other MP4 correction tools that might fix problems?

[Tom4]

General
Complete name : C:\Users\Owner\Desktop\Royal Commission into the Robodebt Scheme Small\Royal Commission into the Robodebt Scheme Small.mp4
Format : dash
Codec ID : dash (dash/mp42/iso6)
File size : 1.00 GiB
Duration : 7 h 19 min
Overall bit rate mode : Variable
Overall bit rate : 327 kb/s

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L2.1
Format settings : CABAC / 5 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 5 frames
Format settings, GOP : M=4, N=90
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 7 h 19 min
Bit rate : 267 kb/s
Nominal bit rate : 300 kb/s
Width : 426 pixels
Height : 240 pixels
Display aspect ratio : 16:9
Original display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 30.000 FPS
Minimum frame rate : 29.412 FPS
Maximum frame rate : 30.303 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.087
Stream size : 838 MiB (82%)
Writing library : x264 core 163 r3059 b684ebe
Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=4 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / stitchable=1 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=infinite / keyint_min=30 / scenecut=40 / intra_refresh=0 / rc_lookahead=20 / rc=abr / mbtree=1 / bitrate=300 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=360 / vbv_bufsize=330 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC SBR
Format/Info : Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name : HE-AAC
Format settings : NBC
Codec ID : mp4a-40-5
Duration : 7 h 19 min
Duration_FirstFrame : 89 ms
Duration_LastFrame : -1 ms
Bit rate mode : Variable
Bit rate : 57.3 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 23.438 FPS (2048 SPF)
Compression mode : Lossy
Stream size : 180 MiB (18%)
Default : Yes
Alternate group : 1

[Tom4]

Loading the mp4 in Avidemux, it states:
contains B-frames, presentation time stamps
missing or monotonically increasing.

Avidemux can try reconstruct correct PTS by decoding video!

-------

Loading the mp4 in Adobe Premiere, only the audio loads?
All very odd for a video that plays fine!

[davexnet]

Try re-encoding in FFmpeg with some flags to rebuild the time stamps
Try this first:

ffmpeg -fflags +genpts  -i "c:\path\sourcefile.mp4" -c:v copy c:\path\out1.mp4"

As an alternative, try this, to re-encode the video

ffmpeg -fflags +genpts  -i "c:\path\sourcefile.mp4" -c:v libx264 c:\path\out2.mp4"

[october262]

Loading the mp4 in Avidemux, it states:
contains B-frames, presentation time stamps
missing or monotonically increasing.

Avidemux can try reconstruct correct PTS by decoding video!

-------

Loading the mp4 in Adobe Premiere, only the audio loads?
All very odd for a video that plays fine!

try the first method in post #2 - https://forum.videohelp.com/threads/405530-Problem-with-B-frames

[Tom4]

Will try all, thanks