Can handbrake retain video transparency when converting from webm to hevc?

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proggerpete
New User
Posts: 1
Joined: Mon Sep 20, 2021 11:51 am

Can handbrake retain video transparency when converting from webm to hevc?

Post by proggerpete »

Description of problem or question:
Can handbrake retain video transparency when converting from webm to hevc?



Steps to reproduce the problem (If Applicable):
Select a webm with transparency as source.
Encode as H.265.
Result: output file is on a black background instead of a transparent one.


HandBrake version (e.g., 1.0.0):
1.4.1



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



HandBrake Activity Log ***required*** (see How-to get an activity log)

Code: Select all

HandBrake 1.4.1 (2021081500)
OS: Microsoft Windows NT 10.0.19043.0
CPU: Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz
Ram: 16344 MB, 
GPU Information:
  NVIDIA GeForce GTX 1080 - 27.21.14.5671
Screen: 2560x1600
Temp Dir: C:\Users\Peter\AppData\Local\Temp\
Install Dir: C:\Program Files\HandBrake\
Data Dir: C:\Users\Peter\AppData\Roaming\HandBrake

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


# Starting Encode ...
[21:54:53] base preset: Fast 1080p30 (Modified)
Remote Process started with Process ID: 27400 using port: 8037. Max Allowed Instances: 1
Worker: Starting HandBrake Engine ...
Worker: Starting Web Server on port 8037 ...
Worker: Disconnected worker monitoring enabled!
[21:54:53] Compile-time hardening features are enabled
[21:54:53] hb_init: starting libhb thread
[21:54:53] Starting work at: Mon Sep 20 21:54:53 2021
[21:54:53] 1 job(s) to process
[21:54:53] json job:
{
  "Audio": {
    "AudioList": [
      {
        "Bitrate": 128,
        "DRC": 0,
        "Encoder": "av_aac",
        "Gain": 0,
        "Mixdown": 4,
        "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",
      "copy:mp2"
    ],
    "FallbackEncoder": "ac3"
  },
  "Destination": {
    "ChapterList": [
      {
        "Name": "Chapter 1"
      }
    ],
    "ChapterMarkers": true,
    "AlignAVStart": false,
    "File": "C:\\dev\\itype-assets\\assets\\assets\\videos\\upshot\\tst\\test2.mp4",
    "Mp4Options": {
      "IpodAtom": false,
      "Mp4Optimize": false
    },
    "Mux": "av_mp4"
  },
  "Filters": {
    "FilterList": [
      {
        "ID": 4,
        "Settings": {
          "mode": "7"
        }
      },
      {
        "ID": 3,
        "Settings": {
          "block-height": "16",
          "block-thresh": "40",
          "block-width": "16",
          "filter-mode": "2",
          "mode": "3",
          "motion-thresh": "1",
          "spatial-metric": "2",
          "spatial-thresh": "1"
        }
      },
      {
        "ID": 13,
        "Settings": {
          "crop-bottom": "0",
          "crop-left": "0",
          "crop-right": "0",
          "crop-top": "0",
          "height": "1080",
          "width": "1920"
        }
      },
      {
        "ID": 6,
        "Settings": {
          "mode": "1"
        }
      }
    ]
  },
  "PAR": {
    "Num": 1,
    "Den": 1
  },
  "Metadata": {},
  "SequenceID": 0,
  "Source": {
    "Angle": 1,
    "Range": {
      "Type": "chapter",
      "Start": 1,
      "End": 1
    },
    "Title": 1,
    "Path": "C:\\dev\\itype-assets\\assets\\assets\\videos\\upshot\\module1\\NP_6A.webm"
  },
  "Subtitle": {
    "Search": {
      "Burn": true,
      "Default": false,
      "Enable": true,
      "Forced": true
    },
    "SubtitleList": []
  },
  "Video": {
    "Encoder": "nvenc_h265",
    "Level": "auto",
    "TwoPass": false,
    "Turbo": false,
    "ColorMatrixCode": 0,
    "Options": "",
    "Preset": "medium",
    "Profile": "auto",
    "Quality": 22,
    "QSV": {
      "Decode": false
    }
  }
}
[21:54:53] CPU: Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz
[21:54:53]  - Intel microarchitecture Skylake
[21:54:53]  - logical processor count: 4
[21:54:53] Intel Quick Sync Video support: no
[21:54:53] hb_scan: path=C:\dev\itype-assets\assets\assets\videos\upshot\module1\NP_6A.webm, title_index=1
udfread ERROR: ECMA 167 Volume Recognition failed
src/libbluray/disc/disc.c:333: failed opening UDF image C:\dev\itype-assets\assets\assets\videos\upshot\module1\NP_6A.webm
src/libbluray/disc/disc.c:437: error opening file BDMV\index.bdmv
src/libbluray/disc/disc.c:437: error opening file BDMV\BACKUP\index.bdmv
src/libbluray/bluray.c:2646: nav_get_title_list(C:\dev\itype-assets\assets\assets\videos\upshot\module1\NP_6A.webm\) failed
[21:54:53] bd: not a bd - trying as a stream/file instead
libdvdread: Encrypted DVD support unavailable.
libdvdrealibdvdread: DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
d: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: vm: failed to read VIDEO_TS.IFO
[21:54:53] dvd: not a dvd - trying as a stream/file instead
Input #0, matroska,webm, from 'C:\dev\itype-assets\assets\assets\videos\upshot\module1\NP_6A.webm':
  Metadata:
    encoder         : libwebm-0.2.1.0
    creation_time   : 2021-02-03T10:18:21.000000Z
  Duration: 00:00:26.38, start: -0.007000, bitrate: 440 kb/s
  Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv), 1920x1080, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      alpha_mode      : 1
  Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
[21:54:53] scan: decoding previews for title 1
[21:54:53] scan: audio 0x1: opus, rate=48000Hz, bitrate=1 English (Opus) (2.0 ch)
[21:54:54] scan: 10 previews, 1920x1080, 24.000 fps, autocrop = 0/0/0/0, aspect 16:9, PAR 1:1, color profile: 1-1-1
[21:54:54] libhb: scan thread found 1 valid title(s)
[21:54:54] Skipping subtitle scan.  No suitable subtitle tracks.
[21:54:54] Starting Task: Encoding Pass
[21:54:54] Skipping crop/scale filter
[21:54:54] work: track 1, dithering not supported by codec
[21:54:54] work: only 1 chapter, disabling chapter markers
[21:54:54] job configuration:
[21:54:54]  * source
[21:54:54]    + C:\dev\itype-assets\assets\assets\videos\upshot\module1\NP_6A.webm
[21:54:54]    + title 1, chapter(s) 1 to 1
[21:54:54]    + container: matroska,webm
[21:54:54]    + data rate: 440 kbps
[21:54:54]  * destination
[21:54:54]    + C:\dev\itype-assets\assets\assets\videos\upshot\tst\test2.mp4
[21:54:54]    + container: MPEG-4 (libavformat)
[21:54:54]  * video track
[21:54:54]    + decoder: vp9 8-bit
[21:54:54]    + filters
[21:54:54]      + Comb Detect (mode=3:spatial-metric=2:motion-thresh=1:spatial-thresh=1:filter-mode=2:block-thresh=40:block-width=16:block-height=16)
[21:54:54]      + Decomb (mode=39)
[21:54:54]      + Framerate Shaper (mode=1)
[21:54:54]        + frame rate: 24.000 fps -> constant 24.000 fps
[21:54:54]    + Output geometry
[21:54:54]      + storage dimensions: 1920 x 1080
[21:54:54]      + pixel aspect ratio: 1 : 1
[21:54:54]      + display dimensions: 1920 x 1080
[21:54:54]    + encoder: H.265 (NVEnc)
[21:54:54]      + preset:  medium
[21:54:54]      + profile: auto
[21:54:54]      + level:   auto
[21:54:54]      + quality: 22.00 (CQ)
[21:54:54]      + color profile: 1-1-1
[21:54:54]  * audio track 1
[21:54:54]    + decoder: English (Opus) (2.0 ch) (track 1, id 0x1)
[21:54:54]      + samplerate: 48000 Hz
[21:54:54]    + mixdown: Stereo
[21:54:54]    + encoder: AAC (libavcodec)
[21:54:54]      + bitrate: 128 kbps, samplerate: 48000 Hz
[21:54:54] sync: expecting 633 video frames
[21:54:54] encavcodecInit: H.265 (Nvidia NVENC)
[21:54:54] encavcodec: encoding at rc=vbr, multipass=fullres, 22.00
[21:54:54] encavcodec: encoding with stored aspect 1/1
[21:54:54] sync: first pts video is 0
[21:54:54] sync: "Chapter 1" (1) at frame 1 time 0
[21:54:54] sync: first pts audio 0x1 is 540
[21:54:58] reader: done. 1 scr changes
[21:54:59] work: average encoding speed for job is 138.201187 fps
[21:54:59] comb detect: heavy 11 | light 6 | uncombed 616 | total 633
[21:54:59] decomb: deinterlaced 11 | blended 6 | unfiltered 616 | total 633
[21:54:59] vfr: 633 frames output, 0 dropped and 0 duped for CFR/PFR
[21:54:59] vfr: lost time: 0 (0 frames)
[21:54:59] vfr: gained time: 0 (0 frames) (0 not accounted for)
[21:54:59] opus-decoder done: 660 frames, 0 decoder errors
[21:54:59] vp9-decoder done: 633 frames, 0 decoder errors
[21:54:59] sync: got 633 frames, 633 expected
[21:54:59] sync: framerate min 24.000 fps, max 24.000 fps, avg 24.000 fps
[21:54:59] mux: track 0, 633 frames, 2660493 bytes, 805.70 kbps, fifo 1024
[21:54:59] mux: track 1, 1237 frames, 405073 bytes, 122.67 kbps, fifo 2048
[21:54:59] Finished work at: Mon Sep 20 21:54:59 2021
[21:54:59] libhb: work result = 0

# Job Completed!
mduell
Veteran User
Posts: 8182
Joined: Sat Apr 21, 2007 8:54 pm

Re: Can handbrake retain video transparency when converting from webm to hevc?

Post by mduell »

No, I think Apple's VideoToolbox is the only encoder that supports alpha transparency in HEVC.
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