I'm trying my hand at editing/typesetting with Aegisub, and so far I've had no issues. But when trying to open a particular .mkv file, I get this error message:
Could not open [Filename]
YUV4MPEG: video is not in a supported format
FFmpegSource: Unknown video color space
I've tried some solutions I've found on this website and elsewhere, from installing LAV filters to running the file through MkvToolNix, but nothing seems to work. Is there something I can change within Aegisub to make this work? I should also mention that FFmpegSource is the only video provider that appears within Aegisub's advanced video settings. Any help is greatly appreciated.
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Mediainfo says it's 4:4:4.
That's another thing I noticed: in MkvToolNix the header editor said that a bunch of the data fields regarding color were blank, but in Mediainfo they're all populated.Last edited by riffraff11235; 12th Mar 2022 at 16:56.
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May I ask, what is the source of these 4:4:4 files ? Your camera? If it's possible please post
A small sample here in the thread -
I believe it was ripped from a Blu-Ray. I'm not sure how much more I can say without breaking forum rules. I managed to snip off a small sample that reproduces the same error when I try to open it in Aegisub. Would it be ok for me to upload it?
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Yes, small samples are fair use -
it's my understanding even UHD blu-ray sticks to the 4:2:0 chromaLast edited by davexnet; 14th Mar 2022 at 16:02.
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Yeah, all of the similar .mkv files I've dealt with seem to have 4:2:0 chroma, except for this one. The source says it was taken from a UHD Blu-Ray and downscaled to 1080p 4:4:4. I've included a ~2 min sample. Also, here's the MediaInfo dump for the video track in case it helps:
Code:Format : AVC Format/Info : Advanced Video Codec Format profile : High 4:4:4 Predictive@L5 Format settings : CABAC / 16 Ref Frames Format settings, CABAC : Yes Format settings, ReFrames : 16 frames Codec ID : V_MPEG4/ISO/AVC Duration : 1 h 35 min Bit rate : 4 914 kb/s Width : 1 920 pixels Height : 816 pixels Display aspect ratio : 2.35:1 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:4:4 Bit depth : 10 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.131 Stream size : 3.29 GiB (59%) Title : UHD to 1080p 4:4:4 Writing library : x264 core 163 r3078M 72c3504 (DJATOM's mod) Encoding settings : cabac=1 / ref=16 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=10 / psy=1 / fade_compensate=0.72 / psy_rd=0.80:0.20 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-1 / threads=16 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=16 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=14.0000 / qcomp=0.72 / qpmin=0 / qpmax=81 / qpstep=4 / ip_ratio=1.40 / aq=3:0.80 Language : Japanese Default : Yes Forced : No Color range : Limited Color primaries : BT.2020 Transfer characteristics : BT.2020 (10-bit) Matrix coefficients : BT.2020 non-constant
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Thanks for the sample. I wonder what the idea was to encode it that way? Wouldn't play properly on my Chromecast nor natively in the LG
TV via DLNA. I don't think you're going to have any choice except convert it for your subtitle programLast edited by davexnet; 14th Mar 2022 at 20:14.
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Huh, more strangeness. It's played fine on every player I've tried on my computer, including MPC-HC, VLC, mpv and avidemux. Downgrading the chroma subsampling when I remuxed did have the added bonus of reducing the video stream size a little, so there's that I guess. Would still be nice if this gets resolved in some future release of Aegisub.
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