Why do I always get a "video sync issues" message on Youtube?

[brassplyer]

Every video I upload shows this "The video you uploaded may have audio/video sync issues" etc. during upload. They never have a problem. Anyone know what triggers this?

[newpball]

Are you uploading H.264?

[brassplyer]

Are you uploading H.264?

Yes, created with Handbrake.

[Baldrick]

Variable framerate? Set it to constant framerate/fps in handbrake.

[brassplyer]

Variable framerate? Set it to constant framerate/fps in handbrake.

No, constant.

[Baldrick]

Post the full details from MediaInfo.

[brassplyer]

Post the full details from MediaInfo.

General
Complete name : E:\Concerto 720p.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 89.4 MiB
Duration : 2mn 21s
Overall bit rate mode : Variable
Overall bit rate : 5 304 Kbps
Encoded date : UTC 2015-04-24 01:49:17
Tagged date : UTC 2015-04-24 02:00:27
Writing application : HandBrake 0.9.9 2013052900

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 8 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2mn 21s
Bit rate mode : Variable
Bit rate : 5 000 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 59.940 fps
Minimum frame rate : 59.920 fps
Maximum frame rate : 59.960 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.091
Stream size : 84.3 MiB (94%)
Writing library : x264 core 130 r2273 b3065e6
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=6 / 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=600 / keyint_min=60 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=2pass / mbtree=1 / bitrate=5000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2015-04-24 01:49:17
Tagged date : UTC 2015-04-24 02:00:26
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 2mn 21s
Bit rate mode : Variable
Bit rate : 288 Kbps
Maximum bit rate : 318 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Delay relative to video : 33ms
Stream size : 4.94 MiB (6%)
Encoded date : UTC 2015-04-24 01:49:17
Tagged date : UTC 2015-04-24 02:00:26

[manono]

Variable framerate? Set it to constant framerate/fps in handbrake.

No, constant.

You sure about that?

General
Complete name : E:\Concerto 720p.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 89.4 MiB
Duration : 2mn 21s
Overall bit rate mode : Variable
Overall bit rate : 5 304 Kbps
Encoded date : UTC 2015-04-24 01:49:17
Tagged date : UTC 2015-04-24 02:00:27
Writing application : HandBrake 0.9.9 2013052900

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 8 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2mn 21s
Bit rate mode : Variable
Bit rate : 5 000 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 59.940 fps
Minimum frame rate : 59.920 fps
Maximum frame rate : 59.960 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.091
Stream size : 84.3 MiB (94%)
Writing library : x264 core 130 r2273 b3065e6
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=6 / 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=600 / keyint_min=60 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=2pass / mbtree=1 / bitrate=5000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2015-04-24 01:49:17
Tagged date : UTC 2015-04-24 02:00:26
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 2mn 21s
Bit rate mode : Variable
Bit rate : 288 Kbps
Maximum bit rate : 318 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Delay relative to video : 33ms
Stream size : 4.94 MiB (6%)
Encoded date : UTC 2015-04-24 01:49:17
Tagged date : UTC 2015-04-24 02:00:26

They like CBR audio, too. I used to get that message also, although there were never any problems with the audio.

[brassplyer]

Variable framerate? Set it to constant framerate/fps in handbrake.

No, constant.

You sure about that?

I'll have to look again, my default is to always choose constant framerate.

[jagabo]

Even if you select constant frame rate when creating MP4 files in Handbrake you will get a variable frame rate file when encoding 23.976, 29.97 or 59.94 fps video. That's because MP4 uses time codes of 1/90000 second duration and those frame rates can't be perfectly represented with that with integers. For example, a 60000/1001 (59.94) fps video should have each frame displalyed for 1501.5/90000 seconds. Handbrake will encode that as VFR alternating between 1501/90000 and 1502/90000 -- averaging to 1501.5/90000 or 1001/60000 seconds per frame.

If you want constant frame rate encode as MKV. Then, if you must have MP4, remux to MP4.

[newpball]

Even if you select constant frame rate when creating MP4 files in Handbrake you will get a variable frame rate file when encoding 23.976, 29.97 or 59.94 fps video. That's because MP4 uses time codes of 1/90000 second duration and those frame rates can't be perfectly represented with that with integers. For example, a 60000/1001 (59.94) fps video should have each frame displalyed for 1501.5/90000 seconds. Handbrake will encode that as VFR alternating between 1501/90000 and 1502/90000 -- averaging to 1501.5/90000 or 1001/60000 seconds per frame.

All this fractional framerate zoo is resolved by playing these videos at integer framerates 24, 30, 60 etc and audio time stretching at encoding (or even real) time.

Perhaps in another decade....

[manono]

If you want constant frame rate encode as MKV. Then, if you must have MP4, remux to MP4.

Is this a Handbrake peculiarity because after using RipBot264 to make MP4s I get:

General
Complete name : H:\Songs\Nau Bahar\1. Nau Bahar - Aeri Main To Prem Diwan.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 83.0 MiB
Duration : 8mn 15s
Overall bit rate mode : Variable
Overall bit rate : 1 406 Kbps
Encoded date : UTC 2015-04-07 01:03:30
Tagged date : UTC 2015-04-07 01:03:30

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 3 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 8mn 15s
Bit rate mode : Variable
Bit rate : 1 275 Kbps
Maximum bit rate : 25.0 Mbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.173
Stream size : 75.2 MiB (91%)
Title : 1
Writing library : x264 core 142 r2479 dd79a61
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=25000 / vbv_bufsize=25000 / crf_max=0.0 / nal_hrd=vbr / filler=0 / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2015-04-07 01:03:30
Tagged date : UTC 2015-04-07 01:03:32

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 8mn 15s
Bit rate mode : Variable
Bit rate : 128 Kbps
Maximum bit rate : 132 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 7.55 MiB (9%)
Encoded date : UTC 2015-04-07 01:03:31
Tagged date : UTC 2015-04-07 01:03:32

I did notice it's saying the audio is VBR also although, as far as I know, it's not.

[jagabo]

Is this a Handbrake peculiarity?

Yes.