I am trying to encode A Quiet Place... I know for a fact there are forced subs, but when trying to encode it from 4K (native) to either 4K (x265) or 1080 (x264), the forced subs are not burned in on the resulting file.
The same command worked fine with burning in the forced subtitles for another movie. When I use Handbrake, it does burn in the forced subtitles.
This is the command I am using:
ffmpeg -y -probesize 2048M -analyzeduration 2048M -forced_subs_only 1 -i ../in/A Quiet Place.mkv -map 0:0 -map 0:1 -map 0:1 -c:v libx264 -preset slower -profile:v high -level 5.1 -crf:v 22 -vf scale=1920:-1 -x264-params ref=5:bframes=5:b_adapt=2:direct=auto:analyse=all:me=umh:merange=24:subme=10:trellis=2:vbv-bufsize=512000:vbv-maxrate=512000:rc-lookahead=60:colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc -c:a:0 aac -ac 6 -c:a:1 ac3 -ac 6 -disposition:a:0 default -disposition:a:1 none ../temp/A Quiet Place - 1080p.mp4 This is my mkv file:
General Unique ID : 23590760640855359557197555294735710745 (0x11BF6A4CB436978F1FFA81AF8C2C3A19) Complete name : ../in/A Quiet Place (2018).mkv Format : Matroska Format version : Version 2 File size : 45.1 GiB Duration : 1 h 30 min Overall bit rate mode : Variable Overall bit rate : 71.5 Mb/s Movie name : A Quiet Place Encoded date : UTC 2018-08-03 16:35:34 Writing application : MakeMKV v1.12.3 win(x64-release) Writing library : libmakemkv v1.12.3 (1.3.5/1.4.7) win(x64-release) Video ID : 1 ID in the original source medium : 4113 (0x1011) Format : HEVC Format/Info : High Efficiency Video Coding Format profile : Main 10@L5.1@High Codec ID : V_MPEGH/ISO/HEVC Duration : 1 h 30 min Bit rate : 66.3 Mb/s Width : 3 840 pixels Height : 2 160 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 (Type 2) Bit depth : 10 bits Bits/(Pixel*Frame) : 0.333 Stream size : 41.8 GiB (93%) Language : English Default : No Forced : No Color range : Limited Color primaries : BT.2020 Transfer characteristics : PQ Matrix coefficients : BT.2020 non-constant Original source medium : Blu-ray Mastering display color primaries : Display P3 Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2 Audio #1 ID : 2 ID in the original source medium : 4352 (0x1100) Format : TrueHD Format profile : TrueHD+Atmos / TrueHD Codec ID : A_TRUEHD Duration : 1 h 30 min Bit rate mode : Variable Bit rate : 3 890 kb/s Maximum bit rate : 8 064 kb/s Channel(s) : Object Based / 8 channels Channel positions : Object Based / Front: L C R, Side: L R, Back: L R, LFE Sampling rate : / 48.0 kHz Frame rate : 1 200.000 FPS (40 SPF) Bit depth : 24 bits Compression mode : Lossless Stream size : 2.45 GiB (5%) Title : Surround 7.1 Language : English Default : Yes Forced : No Original source medium : Blu-ray Audio #2 ID : 3 ID in the original source medium : 4352 (0x1100) Format : AC-3 Format/Info : Audio Coding 3 Codec ID : A_AC3 Duration : 1 h 30 min Bit rate mode : Constant Bit rate : 640 kb/s Channel(s) : 6 channels Channel positions : Front: L C R, Side: L R, LFE Sampling rate : 48.0 kHz Frame rate : 31.250 FPS (1536 SPF) Bit depth : 16 bits Compression mode : Lossy Stream size : 413 MiB (1%) Title : Surround 5.1 Language : English Service kind : Complete Main Default : No Forced : No Original source medium : Blu-ray Audio #3 ID : 4 ID in the original source medium : 4353 (0x1101) Format : AC-3 Format/Info : Audio Coding 3 Codec ID : A_AC3 Duration : 1 h 30 min Bit rate mode : Constant Bit rate : 640 kb/s Channel(s) : 6 channels Channel positions : Front: L C R, Side: L R, LFE Sampling rate : 48.0 kHz Frame rate : 31.250 FPS (1536 SPF) Bit depth : 16 bits Compression mode : Lossy Stream size : 413 MiB (1%) Title : Surround 5.1 Language : English Service kind : Complete Main Default : No Forced : No Original source medium : Blu-ray Text #1 ID : 5 ID in the original source medium : 4768 (0x12A0) Format : PGS Codec ID : S_HDMV/PGS Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs Duration : 1 h 11 min Bit rate : 1 932 b/s Count of elements : 302 Stream size : 1 016 KiB (0%) Language : English Default : No Forced : No Original source medium : Blu-ray Text #2 ID : 6 ID in the original source medium : 4768 (0x12A0) Format : PGS Codec ID : S_HDMV/PGS Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs Duration : 1 h 11 min Bit rate : 1 252 b/s Count of elements : 200 Stream size : 658 KiB (0%) Language : English Default : Yes Forced : No Original source medium : Blu-ray Text #3 ID : 7 ID in the original source medium : 4769 (0x12A1) Format : PGS Codec ID : S_HDMV/PGS Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs Duration : 1 h 22 min Bit rate : 3 951 b/s Count of elements : 652 Stream size : 2.32 MiB (0%) Language : English Default : No Forced : No Original source medium : Blu-ray Menu 00:00:00.000 : en:Chapter 01 00:10:19.118 : en:Chapter 02 00:14:38.002 : en:Chapter 03 00:21:52.894 : en:Chapter 04 00:25:09.674 : en:Chapter 05 00:31:05.029 : en:Chapter 06 00:36:23.389 : en:Chapter 07 00:43:47.124 : en:Chapter 08 00:47:42.526 : en:Chapter 09 00:53:48.058 : en:Chapter 10 01:00:31.377 : en:Chapter 11 01:05:55.326 : en:Chapter 12 01:10:57.836 : en:Chapter 13 01:15:29.066 : en:Chapter 14 01:23:47.147 : en:Chapter 15 1 Answer
What -forced_subs_only does is tell the PGS decoder to only decode subs marked as forced. You need to overlay these subs, which are image-based, to have them visible in the output video. So,
ffmpeg -y -probesize 2048M -analyzeduration 2048M -forced_subs_only 1 -i ../in/A Quiet Place.mkv -map 0:0 -map 0:1 -map 0:1 -c:v libx264 -preset slower -profile:v high -level 5.1 -crf:v 22 -filter_complex [0:v]scale=1920:-1[v];[v][0:s:0]overlay -x264-params ref=5:bframes=5:b_adapt=2:direct=auto:analyse=all:me=umh:merange=24:subme=10:trellis=2:vbv-bufsize=512000:vbv-maxrate=512000:rc-lookahead=60:colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc -c:a:0 aac -ac 6 -c:a:1 ac3 -ac 6 -disposition:a:0 default -disposition:a:1 none ../temp/A Quiet Place - 1080p.mp4
The overlay filter will burn the forced subs from the first subtitle stream onto the video. Depending on subtitle frame size, you may want to scale that stream before overlaying it.
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