1892185 - Unexpected VP9 WebM unplayable in Fenix

Status: UNCONFIRMED

(Core :: Audio/Video, defect)

Description

[Master ? [:masterquestionable]]

Attachment: Extra.txt

    Firefox Fenix 126 (2016013391) (2024-04-06).
    "Video can't be played because the file is corrupt."
    https://github.com/mozilla-mobile/firefox-android/assets/38040960/fd50937d-5442-494e-b4aa-0baf75569a57 (~ 33.91 MiB; WebM: VP9 video, 21.403 s, 24 FPS VFR (avg: 22.61, min: 21.277, max: 25), 2560x1600, YUV 4:2:0, ~ 33.86 MiB; Vorbis audio, 21.369 s, 44,100 Hz, ~ 25.2 KiB)
    https://github.com/mozilla-mobile/firefox-android/pull/5218#issue-2090573376
    .
    Per the thread's following comments (and extra testing) it should be playable.
    [ Unsure if it's regression, as which might be hardware/platform dependent. ]
    Playable in Chrome on the same device.

    Re-muxing doesn't help:
    mkclean --optimize --unsafe --remux "mkclean.webm" [ WebM is Matroska. Not effective as `ffmpeg`. ]
    ffmpeg -i "tablet-tab-strip-3.webm" -c copy -fflags +bitexact -map_metadata -1 -cues_to_front 1 -write_crc32 0 -default_mode 0 "Remux.webm"
    ffmpeg -i "tablet-tab-strip-3.webm" -map v:0 -c copy -fflags +bitexact -map_metadata -1 -cues_to_front 1 -write_crc32 0 -default_mode 0 "VP9.webm"
    ffmpeg -i "tablet-tab-strip-3.webm" -map a:0 -c copy -fflags +bitexact -map_metadata -1 -cues_to_front 1 -write_crc32 0 -default_mode 0 "Vorbis.webm" [ Playable. Note the audio is dummy silence. ]

    MediaError:
    code: 3, message: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) - auto mozilla::MediaChangeMonitor::CreateDecoderAndInit(MediaRawData *)::(anonymous class)::operator()()::(anonymous class)::operator()(const MediaResult &) const: Unable to initialize decoder

    See also:
    https://github.com/richtr/NoSleep.js/issues/157#issuecomment-1529149759
    (my hefty placebo research on VideoWakeLock...)

    Demo snippet: https://github.com/MasterInQuestion/Markup/blob/main/VideoD.htm

    Friendly notice:
    It's recommended to enact below uBlock Origin filter on such pages:
    *$header=content-type:/^video(?=\/|$)/i,domain=github.com|bugzilla.mozilla.org
    (potential bandwidth killer)

    Also, could someone help forward [ https://github.com/MasterInQuestion/talk/discussions/14 ]?
    I'm blocked by the developer.

Comment 1

[Master ? [:masterquestionable]]

    Seems to influence YouTube too. (VP9 video unavailable)
    E.g. https://www.youtube.com/watch?v=IwrWot3jVFI
    [ 2560x1440 VP9 ("itag": 271) ]

    After more diagnosis it appears anything larger than 1920x1080 would fail with the exact MediaError.
    248: 1920x1080 VP9
    247: 1280x720 VP9
    242: 426x240 VP9
    ; all playable.

    Download e.g.
    yt-dlp -f 242 -o "%(id)s.%(format_id)s.%(ext)s" "https://www.youtube.com/watch?v=IwrWot3jVFI"

    Note:
    Per YouTube's report the videos are encoded around 2017-06-07.

Comment 2

[Master ? [:masterquestionable]]

    Not necessarily Fenix only, potentially hardware related.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit BugBot documentation.