|
Another very frustrating issue that doesnt seem to have an apparent cause.
I am having audio/video desync issues where the video seems to lag behind the audio by a split second. It seems to occur after I encode the video. The encoded video file plays fine on VLC and a little out of sync on WMP. However, when I upload to Youtube or Vimeo, it gets much worse (particularly on Firefox, though Chrome isnt too much better).
Video is called SWR Ep1 P1 (by Dreamtime Visions Productions) on vimeo. Can't post link due to being a new user.
I have tried many tests, but nothing seems to fix it. I did notice however that Mediainfo is saying my compressed video has a variable bit rate, yet I specified constant bit rate (320kbs). When I look in Premiere at the length, the audio appears slightly longer than the video, Mediainfo says 8:15 video vs 8:16 audio. This occurs when I encode with X264/AAC using Avisynth/Megui or Handbrake and even straight from Premiere using H.264/AAC. If I try encoding with WMV or using AC-3 or MP3 as audio codecs, it stays solid CBR and it seems more in sync.
While this suggests that soemthing is wrong, I still have no idea what is causing the audio/video desync and it is extremely frustrating.
Details below:
Original source: 1280x720, 120fps from a video game, audio is from a range of sources (mostly 44100 khz but some higher/lower sample rates)
Premiere sequence settings: 1280x720, 59.97 fps, progressive, square pixels, 48000khz, stereo
Export settings: Uncompressed AVI, 1280x720, progressive, square pixels, 59.97 fps (for downloadable copy) or 29.97 fps (for Youtube/Vimeo), 48000khz, stereo, 16 bit sample type
Avisynth script:
AVISource("J:\Final Render\59.94 fps\Vimeo\Part 1\Film Sequence Part 1.avi", audio=false).AssumeFPS(30000,1001)
#deinterlace
#crop
#resize
#denoise
ConvertToYV12(matrix="rec601")
Final encode settings:
General
Complete name : J:\Final Render\59.94 fps\Vimeo\Part 1\SWR Ep1 P1.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 434 MiB
Duration : 8mn 16s
Overall bit rate mode : Variable
Overall bit rate : 7 344 Kbps
Encoded date : UTC 2014-04-09 05:54:02
Tagged date : UTC 2014-04-09 05:54:02
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 5 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 8mn 15s
Bit rate : 7 000 Kbps
Maximum bit rate : 29.7 Mbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.253
Stream size : 415 MiB (96%)
Writing library : x264 core 138 r2358 9e941d1
Encoding settings : cabac=1 / ref=5 / deblock=1:-1:0 / analyse=0x3:0x113 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=32 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-3 / threads=12 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=4 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=30 / keyint_min=15 / scenecut=40 / intra_refresh=0 / rc_lookahead=30 / rc=2pass / mbtree=1 / bitrate=7000 / 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 2014-04-09 05:48:58
Tagged date : UTC 2014-04-09 05:54:02
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 8mn 16s
Bit rate mode : Variable
Bit rate : 320 Kbps
Maximum bit rate : 328 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 18.9 MiB (4%)
Encoded date : UTC 2014-04-09 05:50:04
Tagged date : UTC 2014-04-09 05:54:02
What Ive tried (all without success):
-- Tried exporting at 30 fps
-- Tried resampling some clips at 44100khz and exporting at 44100khz
-- Tried different sample types
-- Tried encoding with Handbrake instead of Megui
Im looking for a solution to this problem, no matter how tedious. The release of this movie has completely stalled and Im quite concerned because I have no idea what the cause of the problem is to fix it.
|
