• VEGAS Pro

  Only a certain segment is jumpy when I render top field first

  Posted by Ethan Nunn on September 29, 2019 at 5:44 pm

  I’m editing some commercials from a VHS transfer. The recording is 720×480 29.97i Top Field First.

  Here’s the mediainfo on the recording:
  General
Complete name : D:\virtualdub\Tape Transfers\techtv tape #1.avi
Format : AVI
Format/Info : Audio Video Interleave
Format profile : OpenDML
File size : 196 GiB
Duration : 6 h 14 min
Overall bit rate : 75.0 Mb/s

  Video
  ID : 0
  Format : AVC
  Format/Info : Advanced Video Codec
  Format profile : High 4:4:4 Predictive@L3
  Format settings : 1 Ref Frames
  Format settings, CABAC : No
  Format settings, Reference frames : 1 frame
  Codec ID : H264
  Duration : 6 h 14 min
  Bit rate : 73.4 Mb/s
  Width : 720 pixels
  Height : 480 pixels
  Display aspect ratio : 3:2
  Frame rate : 29.970 (30000/1001) FPS
  Standard : NTSC
  Color space : YUV
  Chroma subsampling : 4:2:2
  Bit depth : 8 bits
  Scan type : MBAFF
  Scan type, store method : Interleaved fields
  Scan order : Top Field First
  Bits/(Pixel*Frame) : 7.090
  Stream size : 192 GiB (98%)
  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=0 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=0 / threads=7 / lookahead_threads=7 / sliced_threads=1 / slices=7 / nr=0 / decimate=1 / interlaced=tff / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=25 / scenecut=0 / intra_refresh=0 / rc=cqp / mbtree=0 / qp=0

  Audio
ID : 1
Format : PCM
Format settings : Little / Signed
Codec ID : 1
Duration : 6 h 14 min
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 4.02 GiB (2%)
Alignment : Aligned on interleaves
Interleave, duration : 50 ms (1.50 video frames)
Interleave, preload duration : 49 ms

  I’m editing a 720×480 29.97i TFF Vegas project and rendering at 720×480 29.97i TFF so I can do some deinterlacing in AviSynth. However, thsi one segment is always jumpy. For some reason, and I don’t know why this happens, but it seems like the segment is actually BFF even though the entire video is encoded in TFF. Whats the deal? I’ve forced TFF in the project. Is there any way to fix it without rendering the entire video again in BFF (which makes everything else jumpy)?

  I did an ffmpeg encode for uploading the entire tape to archive.org and it seems to throw it off too. It’s always that one ID for some reason. Looks like the original recording does it too. Hmm.

  Here’s a video of my issue.
  https://www.youtube.com/watch?v=OsUVjtNkUz8

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  Ethan Nunn replied 6 years, 7 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Graham Bernard

  September 30, 2019 at 4:51 am

  [Ethan Nunn] “For some reason, and I don’t know why this happens, but it seems like the segment is actually BFF even though the entire video is encoded in TFF. Whats the deal?”

  Hi Ethan! This may assist: Right click on Event > Properties > Video Event Tab > and then select “Disable Resample” . And the Deal, I’m guessing, is VegasPro being very helpful.

  * Grazie

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• 

  Ethan Nunn

  September 30, 2019 at 2:37 pm

  Hi Graham!

  I always have resample disabled so that doesn’t work.

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