Encode start time search

General questions or discussion about HandBrake, Video and/or audio transcoding, trends etc.
Post Reply
DKqwerty
Posts: 16
Joined: Wed May 29, 2019 5:02 pm

Encode start time search

Post by DKqwerty »

Description of problem or question:

Why does queue encoding from time A to time B require the step of "Searching for start time, XX.XX%" (during which the process pauses while position is seeked), yet preview encoding doesn't require this extra search?


Steps to reproduce the problem (If Applicable):

Encode only the last minute or so of a "long" video (using "seconds" drop-down in 'Range'). "Searching…" activates during encode.

Now go to 'Preview', skip to the last preview tick and just set to a minimal preview size (30 or 60 seconds). Preview encode begins immediately, no needing to seek.


HandBrake version (e.g., 1.0.0):

1.3.1 (present in all previous versions I tried down to 0.10.5).


Operating system and version (e.g., Ubuntu 16.04 LTS, macOS 10.13 High Sierra, Windows 10 Creators Update):

Windows 10 Pro 1909 x64 (build 18363.535).


HandBrake Activity Log:

Truncated encode via queue

Code: Select all

HandBrake Nightly 20191229213216-0b089e9-master (2019122901)
OS: Microsoft Windows NT 6.2.9200.0
CPU: Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Ram: 8169 MB, 
GPU Information:
  NVIDIA GeForce GTX 460M - 23.21.13.8857
Screen: 1920x1080
Temp Dir: C:\Users\David\AppData\Local\Temp\
Install Dir: X:\Installers\HandBrake-20191229-0b089e9d1_x86_64-Win_GUI
Data Dir: C:\Users\David\AppData\Roaming\HandBrake\Nightly

-------------------------------------------


# Starting Encode ...

[03:46:05] base preset: Detel
[03:46:05] hb_init: starting libhb thread
[03:46:05] Starting work at: Sun Jan 05 03:46:05 2020
[03:46:05] 1 job(s) to process
[03:46:05] json job:
{
  "Audio": {
    "AudioList": [
      {
        "DRC": 0.0,
        "Encoder": "copy",
        "Gain": 0.0,
        "Mixdown": -1,
        "NormalizeMixLevel": false,
        "Samplerate": 0,
        "Track": 0,
        "DitherMethod": 0
      }
    ],
    "CopyMask": [
      "copy:aac",
      "copy:ac3",
      "copy:dtshd",
      "copy:dts",
      "copy:eac3",
      "copy:flac",
      "copy:mp3",
      "copy:truehd"
    ],
    "FallbackEncoder": "ac3"
  },
  "Destination": {
    "ChapterList": [
      {
        "Name": "Chapter 1"
      }
    ],
    "ChapterMarkers": true,
    "AlignAVStart": false,
    "File": "X:\\----------.mkv",
    "Mp4Options": {
      "IpodAtom": false,
      "Mp4Optimize": false
    },
    "Mux": "mkv"
  },
  "Filters": {
    "FilterList": [
      {
        "ID": 2,
        "Settings": {
          "skip-bottom": "0",
          "skip-left": "0",
          "skip-right": "0",
          "skip-top": "1"
        }
      },
      {
        "ID": 12,
        "Settings": {
          "crop-bottom": "0",
          "crop-left": "0",
          "crop-right": "0",
          "crop-top": "0",
          "height": "1080",
          "width": "1920"
        }
      },
      {
        "ID": 6,
        "Settings": {
          "mode": "0"
        }
      }
    ]
  },
  "PAR": {
    "Num": 1,
    "Den": 1
  },
  "Metadata": {},
  "SequenceID": 0,
  "Source": {
    "Angle": 1,
    "Range": {
      "Type": "time",
      "Start": 351000000,
      "End": 362880000
    },
    "Title": 1,
    "Path": "N:\\Music\\-----\\----------.mpg"
  },
  "Subtitle": {
    "Search": {
      "Burn": false,
      "Default": false,
      "Enable": false,
      "Forced": false
    },
    "SubtitleList": []
  },
  "Video": {
    "Encoder": "x264",
    "Level": "auto",
    "TwoPass": false,
    "Turbo": false,
    "ColorMatrixCode": 0,
    "Options": "rc-lookahead=60:bframes=8:ref=4:merange=64:analyse=all:trellis=2",
    "Preset": "veryfast",
    "Profile": "auto",
    "Quality": 22.0,
    "QSV": {
      "Decode": false,
      "AsyncDepth": 0
    }
  }
}
[03:46:05] CPU: Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
[03:46:05]  - Intel microarchitecture Sandy Bridge
[03:46:05]  - logical processor count: 8
[03:46:05] Intel Quick Sync Video support: no
[03:46:05] hb_scan: path=N:\Music\-----\----------.mpg, title_index=1
udfread ERROR: ECMA 167 Volume Recognition failed
src/libbluray/disc/disc.c:323: failed opening UDF image N:\Music\-----\----------.mpg
src/libbluray/disc/disc.c:424: error opening file BDMV\index.bdmv
src/libbluray/disc/disc.c:424: error opening file BDMV\BACKUP\index.bdmv
src/libbluray/bluray.c:2585: nav_get_title_list(N:\Music\-----\----------.mpg\) failed
[03:46:05] bd: not a bd - trying as a stream/file instead
libdvdnav: Using dvdnav version 6.0.1
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: failed to read VIDEO_TS.IFO
[03:46:05] dvd: not a dvd - trying as a stream/file instead
[03:46:05] file is MPEG Program Stream
[03:46:06] Probing 1 unknown stream
[03:46:06]     Probe: Found stream mpegvideo. stream id 0xe0-0x0
[03:46:06] Found the following streams
[03:46:06]     Video Streams :
[03:46:06]       0xe0-0x0 type MPEG2 (0x2)
[03:46:06]     Audio Streams :
[03:46:06]       0xbd-0x80 type AC3 (0x81)
[03:46:06]     Subtitle Streams :
[03:46:06]     Other Streams :
[03:46:06] stream id 0xbd (type 0x81 substream 0x80) audio 0x8000bd
[03:46:08] scan: decoding previews for title 1
[03:46:08] file is MPEG Program Stream
[03:46:08] Probing 1 unknown stream
[03:46:08]     Probe: Found stream mpegvideo. stream id 0xe0-0x0
[03:46:08] scan: audio 0x8000bd: ac3, rate=48000Hz, bitrate=256000 Unknown (AC3) (2.0 ch) (256 kbps)
[03:46:10] stream: 343 good frames, 0 errors (0%)
[03:46:10] scan: 10 previews, 1920x1080, 29.970 fps, autocrop = 0/0/0/0, aspect 16:9, PAR 1:1
[03:46:10] libhb: scan thread found 1 valid title(s)
[03:46:10] Starting Task: Encoding Pass
[03:46:10] Skipping crop/scale filter
[03:46:10] Auto Passthru: allowed codecs are AAC, AC3, E-AC3, TrueHD, DTS, DTS-HD, MP3, FLAC
[03:46:10] Auto Passthru: fallback is AC3
[03:46:10] Auto Passthru: using AC3 Passthru for track 1
[03:46:10] work: only 1 chapter, disabling chapter markers
[03:46:10] job configuration:
[03:46:10]  * source
[03:46:10]    + N:\Music\-----\----------.mpg
[03:46:10]    + title 1, start 01:05:0.00 stop 01:07:12.00
[03:46:10]  * destination
[03:46:10]    + X:\----------.mkv
[03:46:10]    + container: Matroska (libavformat)
[03:46:10]  * video track
[03:46:10]    + decoder: mpeg2video
[03:46:10]      + bitrate 200 kbps
[03:46:10]    + filters
[03:46:10]      + Detelecine (pullup) (skip-left=0:skip-right=0:skip-top=1:skip-bottom=0)
[03:46:10]      + Framerate Shaper (mode=0)
[03:46:10]        + frame rate: same as source (around 29.970 fps)
[03:46:10]    + Output geometry
[03:46:10]      + storage dimensions: 1920 x 1080
[03:46:10]      + pixel aspect ratio: 1 : 1
[03:46:10]      + display dimensions: 1920 x 1080
[03:46:10]    + encoder: H.264 (libx264)
[03:46:10]      + preset:  veryfast
[03:46:10]      + options: rc-lookahead=60:bframes=8:ref=4:merange=64:analyse=all:trellis=2
[03:46:10]      + profile: auto
[03:46:10]      + level:   auto
[03:46:10]      + quality: 22.00 (RF)
[03:46:10]      + color profile: 1-1-1
[03:46:10]  * audio track 1
[03:46:10]    + decoder: Unknown (AC3) (2.0 ch) (256 kbps) (track 1, id 0x8000bd)
[03:46:10]      + bitrate: 256 kbps, samplerate: 48000 Hz
[03:46:10]    + AC3 Passthru
[03:46:10] file is MPEG Program Stream
[03:46:11] Probing 1 unknown stream
[03:46:11]     Probe: Found stream mpegvideo. stream id 0xe0-0x0
[03:46:11] sync: expecting 3986 video frames
[03:46:11] encx264: min-keyint: 30, keyint: 300
[03:46:11] encx264: encoding at constant RF 22.000000
[03:46:11] encx264: unparsed options: rc-lookahead=60:bframes=8:ref=4:merange=64:analyse=all:trellis=2:weightp=1:subme=2:mixed-refs=0
x264 [info]: using SAR=1/1
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
x264 [info]: profile High, level 4.0, 4:2:0, 8-bit
[03:52:25] sync: first pts audio 0x8000bd is 0
[03:52:25] sync: first pts video is 2652
[03:54:15] sync: reached audio 0x8000bd pts 11880000, exiting early
[03:54:15] sync: reached video pts 11882520, exiting early
[03:54:17] work: average encoding speed for job is 36.070190 fps
[03:54:17] vfr: lost time: 1954953 (0 frames)
[03:54:17] vfr: gained time: 1954953 (2596 frames) (0 not accounted for)
[03:54:17] stream: 4896204 good frames, 0 errors (0%)
[03:54:17] ac3-decoder done: 126921 frames, 0 decoder errors
[03:54:17] mpeg2video-decoder done: 121710 frames, 0 decoder errors
[03:54:17] sync: got 3956 frames, 3986 expected
[03:54:17] sync: framerate min 29.970 fps, max 29.970 fps, avg 29.970 fps
x264 [info]: frame I:14    Avg QP:13.63  size: 73360
x264 [info]: frame P:726   Avg QP:16.77  size: 31226
x264 [info]: frame B:2565  Avg QP:19.67  size: 10117
x264 [info]: consecutive B-frames:  1.9%  3.4%  4.9% 11.9% 50.4% 13.6%  7.8%  1.7%  4.4%
x264 [info]: mb I  I16..4: 43.1% 42.1% 14.8%
x264 [info]: mb P  I16..4: 28.1% 23.0%  1.2%  P16..4: 21.5%  2.9%  1.0%  0.3%  0.1%    skip:21.9%
x264 [info]: mb B  I16..4:  2.1%  3.1%  0.1%  B16..8: 15.8%  2.6%  0.3%  direct:14.9%  skip:61.1%  L0:46.9% L1:45.7% BI: 7.4%
x264 [info]: 8x8 transform intra:47.7% inter:53.7%
x264 [info]: coded y,uvDC,uvAC intra: 25.5% 62.7% 15.0% inter: 4.6% 24.9% 1.0%
x264 [info]: i16 v,h,dc,p: 72% 17%  8%  3%
x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 25% 30%  2%  2%  2%  2%  2%  3%
x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 24% 13%  6%  7%  7%  7%  6%  7%
x264 [info]: i8c dc,h,v,p: 46% 24% 23%  7%
x264 [info]: Weighted P-Frames: Y:5.1% UV:4.0%
x264 [info]: ref P L0: 78.7% 14.6%  6.5%  0.1%
x264 [info]: ref B L0: 88.6%  9.6%  1.8%
x264 [info]: ref B L1: 97.1%  2.9%
x264 [info]: kb/s:3008.93
[03:54:17] mux: track 0, 3305 frames, 49646188 bytes, 3008.13 kbps, fifo 1024
[03:54:17] mux: track 1, 4125 frames, 4224000 bytes, 255.94 kbps, fifo 2048
[03:54:17] Finished work at: Sun Jan 05 03:54:17 2020
[03:54:17] libhb: work result = 0

# Encode Completed ...
Truncated encode via queue

Code: Select all

HandBrake Nightly 20191229213216-0b089e9-master (2019122901)
OS: Microsoft Windows NT 6.2.9200.0
CPU: Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Ram: 8169 MB, 
GPU Information:
  NVIDIA GeForce GTX 460M - 23.21.13.8857
Screen: 1920x1080
Temp Dir: C:\Users\David\AppData\Local\Temp\
Install Dir: X:\Installers\HandBrake-20191229-0b089e9d1_x86_64-Win_GUI
Data Dir: C:\Users\David\AppData\Roaming\HandBrake\Nightly

-------------------------------------------


# Starting Encode ...

[04:01:03] hb_init: starting libhb thread
[04:01:03] Starting work at: Sun Jan 05 04:01:03 2020
[04:01:03] 1 job(s) to process
[04:01:03] json job:
{
  "Audio": {
    "AudioList": [
      {
        "DRC": 0.0,
        "Encoder": "copy",
        "Gain": 0.0,
        "Mixdown": -1,
        "NormalizeMixLevel": false,
        "Samplerate": 0,
        "Track": 0,
        "DitherMethod": 0
      }
    ],
    "CopyMask": [
      "copy:aac",
      "copy:ac3",
      "copy:dtshd",
      "copy:dts",
      "copy:eac3",
      "copy:flac",
      "copy:mp3",
      "copy:truehd"
    ],
    "FallbackEncoder": "ac3"
  },
  "Destination": {
    "ChapterList": [
      {
        "Name": "Chapter 1"
      }
    ],
    "ChapterMarkers": true,
    "AlignAVStart": false,
    "File": "X:\\----------_preview.mkv",
    "Mp4Options": {
      "IpodAtom": false,
      "Mp4Optimize": false
    },
    "Mux": "mkv"
  },
  "Filters": {
    "FilterList": [
      {
        "ID": 2,
        "Settings": {
          "skip-bottom": "0",
          "skip-left": "0",
          "skip-right": "0",
          "skip-top": "1"
        }
      },
      {
        "ID": 12,
        "Settings": {
          "crop-bottom": "0",
          "crop-left": "0",
          "crop-right": "0",
          "crop-top": "0",
          "height": "1080",
          "width": "1920"
        }
      },
      {
        "ID": 6,
        "Settings": {
          "mode": "0"
        }
      }
    ]
  },
  "PAR": {
    "Num": 1,
    "Den": 1
  },
  "Metadata": {},
  "SequenceID": 0,
  "Source": {
    "Angle": 1,
    "Range": {
      "Type": "preview",
      "Start": 20,
      "End": 5400000,
      "SeekPoints": 20
    },
    "Title": 1,
    "Path": "N:\\Music\\-----\\----------.mpg"
  },
  "Subtitle": {
    "Search": {
      "Burn": false,
      "Default": false,
      "Enable": false,
      "Forced": false
    },
    "SubtitleList": []
  },
  "Video": {
    "Encoder": "x264",
    "Level": "auto",
    "TwoPass": false,
    "Turbo": false,
    "ColorMatrixCode": 0,
    "Options": "rc-lookahead=60:bframes=8:ref=4:merange=64:analyse=all:trellis=2",
    "Preset": "veryfast",
    "Profile": "auto",
    "Quality": 22.0,
    "QSV": {
      "Decode": false,
      "AsyncDepth": 0
    }
  }
}
[04:01:03] CPU: Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
[04:01:03]  - Intel microarchitecture Sandy Bridge
[04:01:03]  - logical processor count: 8
[04:01:03] Intel Quick Sync Video support: no
[04:01:03] hb_scan: path=N:\Music\-----\----------.mpg, title_index=1
udfread ERROR: ECMA 167 Volume Recognition failed
src/libbluray/disc/disc.c:323: failed opening UDF image N:\Music\-----\----------.mpg
src/libbluray/disc/disc.c:424: error opening file BDMV\index.bdmv
src/libbluray/disc/disc.c:424: error opening file BDMV\BACKUP\index.bdmv
src/libbluray/bluray.c:2585: nav_get_title_list(N:\Music\-----\----------.mpg\) failed
[04:01:03] bd: not a bd - trying as a stream/file instead
libdvdnav: Using dvdnav version 6.0.1
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: failed to read VIDEO_TS.IFO
[04:01:03] dvd: not a dvd - trying as a stream/file instead
[04:01:03] file is MPEG Program Stream
[04:01:03] Probing 1 unknown stream
[04:01:03]     Probe: Found stream mpegvideo. stream id 0xe0-0x0
[04:01:03] Found the following streams
[04:01:03]     Video Streams :
[04:01:03]       0xe0-0x0 type MPEG2 (0x2)
[04:01:03]     Audio Streams :
[04:01:03]       0xbd-0x80 type AC3 (0x81)
[04:01:03]     Subtitle Streams :
[04:01:03]     Other Streams :
[04:01:03] stream id 0xbd (type 0x81 substream 0x80) audio 0x8000bd
[04:01:03] scan: decoding previews for title 1
[04:01:03] file is MPEG Program Stream
[04:01:03] Probing 1 unknown stream
[04:01:03]     Probe: Found stream mpegvideo. stream id 0xe0-0x0
[04:01:03] scan: audio 0x8000bd: ac3, rate=48000Hz, bitrate=256000 Unknown (AC3) (2.0 ch) (256 kbps)
[04:01:03] stream: 343 good frames, 0 errors (0%)
[04:01:03] scan: 10 previews, 1920x1080, 29.970 fps, autocrop = 0/0/0/0, aspect 16:9, PAR 1:1
[04:01:03] libhb: scan thread found 1 valid title(s)
[04:01:03] Starting Task: Encoding Pass
[04:01:03] Skipping crop/scale filter
[04:01:03] Auto Passthru: allowed codecs are AAC, AC3, E-AC3, TrueHD, DTS, DTS-HD, MP3, FLAC
[04:01:03] Auto Passthru: fallback is AC3
[04:01:03] Auto Passthru: using AC3 Passthru for track 1
[04:01:03] work: only 1 chapter, disabling chapter markers
[04:01:03] job configuration:
[04:01:03]  * source
[04:01:03]    + N:\Music\-----\----------.mpg
[04:01:03]    + title 1, start 00:00:0.00 stop 00:01:0.00
[04:01:03]  * destination
[04:01:03]    + X:\----------_preview.mkv
[04:01:03]    + container: Matroska (libavformat)
[04:01:03]  * video track
[04:01:03]    + decoder: mpeg2video
[04:01:03]      + bitrate 200 kbps
[04:01:03]    + filters
[04:01:03]      + Detelecine (pullup) (skip-left=0:skip-right=0:skip-top=1:skip-bottom=0)
[04:01:03]      + Framerate Shaper (mode=0)
[04:01:03]        + frame rate: same as source (around 29.970 fps)
[04:01:03]    + Output geometry
[04:01:03]      + storage dimensions: 1920 x 1080
[04:01:03]      + pixel aspect ratio: 1 : 1
[04:01:03]      + display dimensions: 1920 x 1080
[04:01:03]    + encoder: H.264 (libx264)
[04:01:03]      + preset:  veryfast
[04:01:03]      + options: rc-lookahead=60:bframes=8:ref=4:merange=64:analyse=all:trellis=2
[04:01:03]      + profile: auto
[04:01:03]      + level:   auto
[04:01:03]      + quality: 22.00 (RF)
[04:01:03]      + color profile: 1-1-1
[04:01:03]  * audio track 1
[04:01:03]    + decoder: Unknown (AC3) (2.0 ch) (256 kbps) (track 1, id 0x8000bd)
[04:01:03]      + bitrate: 256 kbps, samplerate: 48000 Hz
[04:01:03]    + AC3 Passthru
[04:01:03] file is MPEG Program Stream
[04:01:04] Probing 1 unknown stream
[04:01:04]     Probe: Found stream mpegvideo. stream id 0xe0-0x0
[04:01:04] sync: expecting 1828 video frames
[04:01:04] encx264: min-keyint: 30, keyint: 300
[04:01:04] encx264: encoding at constant RF 22.000000
[04:01:04] encx264: unparsed options: rc-lookahead=60:bframes=8:ref=4:merange=64:analyse=all:trellis=2:weightp=1:subme=2:mixed-refs=0
x264 [info]: using SAR=1/1
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
x264 [info]: profile High, level 4.0, 4:2:0, 8-bit
[04:01:04] sync: first pts audio 0x8000bd is 0
[04:01:04] sync: first pts video is 3690
[04:01:50] sync: reached audio 0x8000bd pts 5400000, exiting early
[04:01:50] sync: reached video pts 5400081, exiting early
[04:01:53] work: average encoding speed for job is 39.049423 fps
[04:01:54] vfr: lost time: 894894 (0 frames)
[04:01:54] vfr: gained time: 894894 (1184 frames) (0 not accounted for)
[04:01:54] stream: 87301 good frames, 0 errors (0%)
[04:01:54] ac3-decoder done: 2645 frames, 0 decoder errors
[04:01:54] mpeg2video-decoder done: 2527 frames, 0 decoder errors
[04:01:54] sync: got 1797 frames, 1828 expected
[04:01:54] sync: framerate min 29.970 fps, max 29.970 fps, avg 29.970 fps
x264 [info]: frame I:22    Avg QP:15.10  size: 58720
x264 [info]: frame P:351   Avg QP:16.55  size: 30030
x264 [info]: frame B:1126  Avg QP:19.48  size:  9341
x264 [info]: consecutive B-frames:  4.3%  5.7%  4.2% 12.3% 45.7% 13.2%  6.1%  4.3%  4.2%
x264 [info]: mb I  I16..4: 42.9% 48.3%  8.7%
x264 [info]: mb P  I16..4: 29.6% 23.5%  0.8%  P16..4: 22.5%  2.1%  0.6%  0.2%  0.0%    skip:20.7%
x264 [info]: mb B  I16..4:  2.0%  3.6%  0.1%  B16..8: 13.2%  1.7%  0.1%  direct:17.3%  skip:62.0%  L0:46.4% L1:48.2% BI: 5.5%
x264 [info]: 8x8 transform intra:48.6% inter:60.0%
x264 [info]: coded y,uvDC,uvAC intra: 25.9% 66.0% 19.2% inter: 3.4% 29.6% 1.8%
x264 [info]: i16 v,h,dc,p: 74% 15%  8%  3%
x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 24% 29%  3%  2%  2%  2%  2%  2%
x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 24% 15%  6%  6%  6%  6%  5%  5%
x264 [info]: i8c dc,h,v,p: 44% 24% 24%  8%
x264 [info]: Weighted P-Frames: Y:12.8% UV:11.1%
x264 [info]: ref P L0: 76.9% 14.9%  7.2%  0.9%
x264 [info]: ref B L0: 86.3% 11.3%  2.4%
x264 [info]: ref B L1: 96.2%  3.8%
x264 [info]: kb/s:2982.11
[04:01:54] mux: track 0, 1499 frames, 22350239 bytes, 2978.71 kbps, fifo 1024
[04:01:54] mux: track 1, 1875 frames, 1920000 bytes, 255.89 kbps, fifo 1024
[04:01:54] Finished work at: Sun Jan 05 04:01:54 2020
[04:01:54] libhb: work result = 0

# Encode Completed ...
Top
mduell
Veteran User
Posts: 8198
Joined: Sat Apr 21, 2007 8:54 pm

Re: Encode start time search

Post by mduell »

Point to point encoding assumes you care that the encode starts where you specify.

The previews just approximate a location in the video without regard for exact timing.
Top
DKqwerty
Posts: 16
Joined: Wed May 29, 2019 5:02 pm

Re: Encode start time search

Post by DKqwerty »

That's all well and good, but I've literally NEVER had a preview encode not start and stop at the exact same frames. If "drop-in" encoding is so imprecise, wouldn't I expect that occasionally previews will add or drop frames?

And I understand that in many cases, "frame X" isn't always a complete frame and might need previous frames to fully compose, but waiting 5 minutes for the program to reach near the end of a file just to test the final minutes of an encode is maddening, especially if I have to test a multi-hour file many times over to get it right.

Seems like this is an option that could at least be a toggle: activate searching if paranoid about frame precision, but turn off if just running tests or if frame precision is unimportant. Because at the moment it feels more like I'm editing on VHS rather than digital formats.
Top
DKqwerty
Posts: 16
Joined: Wed May 29, 2019 5:02 pm

Re: Encode start time search

Post by DKqwerty »

Sorry, forgot to also say: thanks for responding, mduell!
(Doesn't seem I can edit my previous posts… :roll:.)
Top
mduell
Veteran User
Posts: 8198
Joined: Sat Apr 21, 2007 8:54 pm

Re: Encode start time search

Post by mduell »

Of course it starts and ends on a frame, but the frame location is just approximate in the file, not at exactly 80% or whatever. If you're previewing the same file, the location it starts should be the same each time.

There's no point to point option for "give me the last half-ish of the video"; the point to point options are frame, second, or chapter specific.
Top
User avatar
BradleyS
Moderator
Posts: 1860
Joined: Thu Aug 09, 2007 12:16 pm

Re: Encode start time search

Post by BradleyS »

If I'm not mistaken, the previews locations are calculated at a byte offset, not a time offset. Precise time start requires scanning the source, as skipping to a byte offset is no guarantee of time.
Top
Post Reply

Return to “General Questions”