Out of sync after rendering - VirtualDub2 and MeGui

[Anonymous847344]

This situation is driving me crazy.
I downloaded a video using DownloaderHelper. My main problem is there is no way after enconding to get the audio and video synchronized. It plays perfectly in MPC and in the preview of VirtualDub2, but after I play the reencoded video it always get desync.
Here is the original video:

Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 7.26 GiB
Duration : 2 h 44 min
Overall bit rate mode : Variable
Overall bit rate : 6 307 kb/s

Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.2
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference : 1 frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2 h 44 min
Source duration : 2 h 44 min
Bit rate mode : Variable
Bit rate : 6 181 kb/s
Maximum bit rate : 9 000 kb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 54.560 FPS
Minimum frame rate : 0.010 FPS
Maximum frame rate : 60.000 FPS
Original frame rate : 60.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.123
Stream size : 7.12 GiB (98%)
Source stream size : 7.12 GiB (98%)
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
mdhd_Duration : 9888647
Codec configuration box : avcC

Audio
ID : 1
Format : AAC LC SBR
Format/Info : Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name : HE-AAC
Format settings : Implicit
Codec ID : mp4a-40-2
Duration : 2 h 30 min
Source duration : 2 h 44 min
Bit rate mode : Variable
Bit rate : 114 kb/s
Nominal bit rate : 127 kb/s
Maximum bit rate : 196 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 : 122 MiB (2%)
Source stream size : 136 MiB (2%)
mdhd_Duration : 9001430

Text
ID : 2-CC1
Format : EIA-608
Muxing mode : SCTE 128 / DTVCC Transport
Muxing mode, more info : Muxed in Video #1
Duration : 2 h 44 min
Bit rate mode : Constant
Stream size : 0.00 Byte (0%)
CaptionServiceName : CC1

Here the resulted video in MeGui using the following script (auto generated after File Indexer):

LoadPlugin("C:\Megui\tools\lsmash\LSMASHSource.dll ")
LWLibavVideoSource("C:\Users\Username\dwhelper\spo rts.mp4")

Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/avc1)
File size : 3.25 GiB
Duration : 2 h 44 min
Overall bit rate mode : Variable
Overall bit rate : 2 827 kb/s
Encoded date : UTC 2021-02-22 20:34:49
Tagged date : UTC 2021-02-22 20:34:49

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 8 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference : 8 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2 h 44 min
Bit rate : 2 676 kb/s
Maximum bit rate : 8 874 kb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 54.560 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.053
Stream size : 3.08 GiB (95%)
Writing library : x264 core 157 r2969 d4099dd
Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / 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=22 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=546 / keyint_min=54 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2021-02-22 20:34:49
Tagged date : UTC 2021-02-22 20:35:29
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 2 h 30 min
Bit rate mode : Variable
Bit rate : 160 kb/s
Maximum bit rate : 164 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 172 MiB (5%)
Language : English
Encoded date : UTC 2021-02-22 18:31:55
Tagged date : UTC 2021-02-22 20:35:29

File generated with Virtualdub2 (drag and drop video):

Format : AVI
Format/Info : Audio Video Interleave
Format profile : OpenDML
File size : 12.5 GiB
Duration : 2 h 44 min
Overall bit rate : 10.8 Mb/s
Writing library : VirtualDub2 build 44282/release

Video
ID : 0
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.2
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, Reference : 1 frame
Codec ID : H264
Duration : 2 h 44 min
Bit rate : 7 757 kb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate : 54.560 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.154
Stream size : 8.93 GiB (72%)
Writing library : x264 core 152 r2851bm ba24899
Encoding settings : cabac=0 / ref=1 / deblock=0:0:0 / analyse=0:0 / me=dia / subme=0 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=22 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=25 / scenecut=0 / intra_refresh=0 / rc=crf / mbtree=0 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=0

Audio
ID : 1
Format : PCM
Format profile : Float
Codec ID : 00000003-0000-0010-8000-00AA00389B71
Codec ID/Hint : IEEE
Duration : 2 h 44 min
Bit rate mode : Constant
Bit rate : 3 072 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Bit depth : 32 bits
Stream size : 3.54 GiB (28%)
Alignment : Aligned on interleaves
Interleave, duration : 18 ms (1.00 video frame)
Interleave, preload duratio : 500 ms

I also tried LWLibavVideoSource("C:\Users\Jorgito\dwhelper\spor ts.mkv", FPSNum=60000, FPSDen=1001) with same results.

What I noticed is that the webvideo lenght is 2:30 but downloaded is 2:44. When playing the downloaded video there is no problem. But I saw the commercials were cut and that creates the desync in the resulted video. When playing in that part (there are many commercials) the video freezes and the audio keeps playing but stops after a few seconds, you must to click the timeline to continue playing the video (in this case is automatically synced when you do this). This is all in the downloaded video, not re-encoded.

[jagabo]

You need to force constant frame rate in the decoder.

[Anonymous847344]

You need to force constant frame rate in the decoder.

It didn't work for me in MeGui doing LWLibavVideoSource("C:\Users\Jorgito\dwhelper\spor ts.mkv", FPSNum=60000, FPSDen=1001), I will try doing the frame constant in VirtualDub2 and telling the results.

Edit: Worked forcing to constant framerate at 59.940fps in VirtualDub2. It would be good to know if this can be done in MeGui too, because with the script mentioned above didn't work.