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To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: "Invalid DTS" warnings only in Cygwin version of ffmpeg
Thread-Topic: "Invalid DTS" warnings only in Cygwin version of ffmpeg
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Date: Mon, 25 May 2026 00:47:21 +0000
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From: destal takul via Cygwin <cygwin AT cygwin DOT com>
Reply-To: destal takul <destaltakul AT outlook DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Nearly every file muxed using MKVToolnix, when remuxed using the Cygwin version of ffmpeg with '-c copy', will result in "Invalid DTS: XX PTS: XX, replacing by guess" and "Non-monotonic DTS; previous: XX, current: XX; changing to XX. This may result in incorrect timestamps in the output file." warnings, while the Linux and native Windows builds (by gyan.dev) of the exact same ffmpeg version do not generate such warnings when remuxing the exact same input file. This seems to be stemming from some math library difference that results in incorrect parsing of timestamps in the Cygwin version.

To reproduce:


  *
wget https://file-examples.com/storage/fe38e3e4816a13971965303/2017/04/file_example_MP4_1920_18MG.mp4
  *
mkvmerge file_example_MP4_1920_18MG.mp4 -o file_example_MP4_1920_18MG.mkv
  *
ffmpeg -i file_example_MP4_1920_18MG.mkv -c copy out.mkv

On Cygwin:

ffmpeg version 8.1.1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 13 (GCC)
  configuration: --disable-sndio --disable-libjack --prefix=/usr --enable-pic --disable-stripping --enable-shared --disable-static --enable-gpl --enable-version3 --disable-openssl --enable-bzlib --enable-gcrypt --enable-gnutls --enable-ladspa --disable-cuda-sdk --enable-libaom --enable-libsvtav1 --enable-libdav1d --enable-libass --enable-libbs2b --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libvpl --enable-libmodplug --enable-libmp3lame --enable-libopenh264-dlopen --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libxvid --enable-libzmq --enable-openal --disable-opencl --enable-opengl --enable-mfdec --enable-libde265 --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-pthreads --enab
 le-muxers --enable-demuxers --enable-hwaccels --disable-encoders --disable-decoders --disable-decoder='h264,hevc,vc1' --enable-encoder=',a64multi,a64multi5,aac,aac_mf,libfdk_aac,ac3,ac3_mf,adpcm_adx,adpcm_argo,adpcm_g722,adpcm_g726,adpcm_g726le,adpcm_ima_alp,adpcm_ima_amv,adpcm_ima_apm,adpcm_ima_qt,adpcm_ima_ssi,adpcm_ima_wav,adpcm_ima_ws,adpcm_ms,adpcm_swf,adpcm_yamaha,alac,alias_pix,amv,anull,apng,ass,asv1,asv2,av1_d3d12va,av1_amf,av1_nvenc,av1_qsv,av1_mf,av1_vulkan,,bitpacked,bmp,cinepak,cljr,dca,dfpwm,dnxhd,dnxhr,dpx,dvbsub,dvdsub,dvvideo,exr,ffv1,ffv1_vulkan,ffvhuff,flac,flashsv,flashsv2,flv,g723_1,gif,h261,h263,h263p,h264_d3d12va,h264_amf,h264_nvenc,h264_qsv,h264_mf,h264_vulkan,,hap,hdr,hevc_d3d12va,hevc_amf,hevc_nvenc,hevc_qsv,hevc_mf,hevc_vulkan,,huffyuv,ilbc,jpeg2000,jpegls,libaom,libaom_av1,,libgsm,libgsm_ms,,,libmp3lame,mp3_mf,,libopenh264,libopenjpeg,libopus,,libspeex,libsvtav1,libtheora,libtwolame,,libvorbis,libvpx_vp8,libvpx_vp9,libwebp,libwebp_anim,,libxvid,mjpeg,mjpe
 g_qsv,,mlp,movtext,mp2,mp2fixed,mpeg1video,mpeg2_qsv,,mpeg2video,mpeg4,msmpeg4v2,msmpeg4v3,msvideo1,nellymoser,opus,pam,pbm,pcm_alaw,pcm_f32be,pcm_f32le,pcm_f64be,pcm_f64le,pcm_mulaw,pcm_s16be,pcm_s16be_planar,pcm_s16le,pcm_s16le_planar,pcm_s24be,pcm_s24le,pcm_s24le_planar,pcm_s32be,pcm_s32le,pcm_s32le_planar,pcm_s8,pcm_s8_planar,pcm_u16be,pcm_u16le,pcm_u24be,pcm_u24le,pcm_u32be,pcm_u32le,pcm_u8,pcx,pgm,pgmyuv,phm,png,ppm,prores,prores_aw,prores_ks,prores_ks_vulkan,qoi,qtrle,r10k,r210,ra_144,rawvideo,roq,roq_dpcm,rpza,rv10,rv20,s302m,sbc,sgi,smc,snow,sonic,sonic_ls,speedhq,srt,ssa,subrip,sunrast,svq1,targa,text,tiff,truehd,tta,ttml,utvideo,v210,v308,v408,v410,vc1_qsv,vc2,vnull,vorbis,vp8_qsv,,vp9_qsv,,wavpack,wbmp,webvtt,wmav1,wmav2,wmv1,wmv2,wrapped_avframe,xbm,xface,xsub,xwd,y41p,yuv4,zlib,zmbv,' --enable-decoder=',aac,aasc,libfdk_aac,ac3,acelp_kelvin,adpcm_4xm,adpcm_adx,adpcm_afc,adpcm_agm,adpcm_aica,adpcm_argo,adpcm_ct,adpcm_dtk,adpcm_ea,adpcm_ea_maxis_xa,adpcm_ea_r1,adpcm_ea_r2
 ,adpcm_ea_r3,adpcm_ea_xas,adpcm_g722,adpcm_g726,adpcm_g726le,adpcm_ima_acorn,adpcm_ima_alp,adpcm_ima_amv,adpcm_ima_apc,adpcm_ima_apm,adpcm_ima_cunning,adpcm_ima_dat4,adpcm_ima_dk3,adpcm_ima_dk4,adpcm_ima_ea_eacs,adpcm_ima_ea_sead,adpcm_ima_iss,adpcm_ima_moflex,adpcm_ima_mtf,adpcm_ima_oki,adpcm_ima_qt,,adpcm_ima_rad,adpcm_ima_smjpeg,adpcm_ima_ssi,adpcm_ima_wav,adpcm_ima_ws,adpcm_ms,adpcm_mtaf,adpcm_psx,adpcm_sbpro_2,adpcm_sbpro_3,adpcm_sbpro_4,adpcm_swf,adpcm_thp,adpcm_thp_le,adpcm_vima,adpcm_xa,adpcm_xmd,adpcm_yamaha,adpcm_zork,aic,alac,alias_pix,amrnb,amrwb,amv,anm,ansi,anull,apac,ape,apng,apv,arbc,argo,ass,asv1,asv2,atrac1,atrac3,atrac3al,atrac3p,atrac3pal,aura,aura2,av1,av1_amf,av1_cuvid,av1_qsv,bethsoftvid,bfi,bink,binkaudio_dct,binkaudio_rdft,bintext,bitpacked,bmp,bmv_audio,bmv_video,bonk,brender_pix,c93,cbd2_dpcm,ccaption,cdgraphics,cdtoons,cdxl,cinepak,clearvideo,cljr,cook,cpia,cscd,cyuv,dca,dds,derf_dpcm,dfa,dfpwm,dirac,dnxhd,dnxhr,dolby_e,dpx,dsd_lsbf,dsd_msbf,dsicinaudio,d
 sicinvideo,dss_sp,dvaudio,dvbsub,dvdsub,dvvideo,dxa,dxtory,eacmv,eamad,eatgq,eatgv,eatqi,eightbps,eightsvx_exp,eightsvx_fib,escape124,escape130,evrc,exr,ffv1,ffvhuff,ffwavesynth,fits,flac,flashsv,flashsv2,flic,flv,fmvc,fourxm,ftr,g723_1,g729,gdv,gem,gif,gremlin_dpcm,gsm,gsm_ms,,h261,h263,h263i,h263p,h264_amf,h264_cuvid,h264_qsv,hevc_amf,hevc_cuvid,hevc_qsv,libde265,hap,hca,hcom,hdr,hnm4_video,hq_hqa,hqx,huffyuv,hymt,iac,idcin,idf,iff_ilbm,ilbc,imc,indeo2,indeo3,indeo4,indeo5,interplay_acm,interplay_dpcm,interplay_video,ipu,jacosub,jpeg2000,jpegls,jv,kgv1,kmvc,lagarith,,,libaom,libaom_av1,,libdav1d,libgsm,libgsm_ms,,,,,libopenh264,libopenjpeg,libopus,librsvg,libschroedinger,libspeex,libvorbis,libvpx_vp8,libvpx_vp9,,,loco,lscr,m101,mace3,mace6,mdec,media100,metasound,microdvd,mimic,misc4,mjpeg,mjpeg_cuvid,mjpeg_qsv,mjpegb,mlp,mmvideo,motionpixels,movtext,mp1,mp1float,mp2,mp2float,mp3,mp3adu,mp3adufloat,mp3float,mp3on4,mp3on4float,mpc7,mpc8,mpeg1_cuvid,mpeg1video,mpeg2_cuvid,mpeg2_qsv,
 mpeg2video,mpeg4,mpeg4_cuvid,mpegvideo,mpl2,msa1,mscc,msmpeg4v1,msmpeg4v2,msmpeg4v3,msnsiren,msp2,msrle,mss1,,msvideo1,mszh,mts2,mv30,mvc1,mvc2,mvdv,mvha,mwsc,mxpeg,nellymoser,nuv,on2avc,opus,paf_audio,paf_video,pam,pbm,pcm_alaw,pcm_bluray,pcm_dvd,pcm_f16le,pcm_f24le,pcm_f32be,pcm_f32le,pcm_f64be,pcm_f64le,pcm_lxf,pcm_mulaw,pcm_s16be,pcm_s16be_planar,pcm_s16le,pcm_s16le_planar,pcm_s24be,pcm_s24daud,pcm_s24le,pcm_s24le_planar,pcm_s32be,pcm_s32le,pcm_s32le_planar,pcm_s64be,pcm_s64le,pcm_s8,pcm_s8_planar,pcm_sga,pcm_u16be,pcm_u16le,pcm_u24be,pcm_u24le,pcm_u32be,pcm_u32le,pcm_u8,pcm_vidc,pcx,pfm,pgm,pgmyuv,pgssub,pgx,phm,photocd,pictor,pjs,png,ppm,prores,prores_raw,prosumer,psd,ptx,qcelp,qdm2,qdmc,qdraw,qoa,qoi,qpeg,qtrle,r10k,r210,ra_144,ra_288,rasc,rawvideo,realtext,rka,rl2,roq,roq_dpcm,rpza,rscc,rv10,rv20,s302m,sami,sanm,sbc,screenpresso,sdx2_dpcm,sgi,sgirle,shorten,simbiosis_imx,sipr,siren,smackaud,smacker,smc,smvjpeg,snow,sol_dpcm,sonic,sp5x,speedhq,speex,srgc,srt,ssa,stl,subrip,su
 bviewer,subviewer1,sunrast,svq1,svq3,tak,targa,targa_y216,tdsc,text,theora,thp,tiertexseqvideo,tiff,tmv,truehd,truemotion1,truemotion2,truemotion2rt,truespeech,tscc,tscc2,tta,twinvq,txd,ulti,utvideo,v210,v210x,v308,v408,v410,vb,vble,vc1_cuvid,vc1_qsv,vcr1,vmdaudio,vmdvideo,vmnc,vnull,vorbis,vp3,vp4,vp5,vp6,vp6a,vp6f,vp7,vp8,vp8_cuvid,vp8_qsv,vp9,vp9_amf,vp9_cuvid,vp9_qsv,vplayer,vqa,vqc,wady_dpcm,wavarc,wavpack,wbmp,wcmv,webp,webvtt,wmav1,wmav2,wmavoice,wmv1,wmv2,wnv1,wrapped_avframe,ws_snd1,xan_dpcm,xan_wc3,xan_wc4,xbin,xbm,xface,xl,xpm,xsub,xwd,y41p,ylc,yop,yuv4,zero12v,zerocodec,zlib,zmbv,,,aac_mf,eac3_mf,av1_mf,h264_mf,hevc_mf,mjpeg_mf,mp1_mf,mp2_mf,mp3_mf,mpeg2_mf,mpeg4_mf,msmpeg4v1_mf,msmpeg4v2_mf,msmpeg4v3_mf,vc1_mf,mwalossless_mf,wmapro_mf,wmav1_mf,wmav2_mf,wmavvoice_mf,wmv1_mf,wmv2_mf,wmv3_mf,'
  libavutil      60. 26.101 / 60. 26.101
  libavcodec     62. 28.101 / 62. 28.101
  libavformat    62. 12.101 / 62. 12.101
  libavdevice    62.  3.101 / 62.  3.101
  libavfilter    11. 14.101 / 11. 14.101
  libswscale      9.  5.101 /  9.  5.101
  libswresample   6.  3.101 /  6.  3.101
[libopenh264 @ 0xa0005bdc0] No such file or directory: libopenh264.dll is missing, openh264 support will be disabled
To enable it, please install libopenh264 package, which is licensed under http://www.openh264.org/BINARY_LICENSE.txt.
[in#0/matroska,webm @ 0xa00055200] Failed to open codec in avformat_find_stream_info
[libopenh264 @ 0xa0005bdc0] No such file or directory: libopenh264.dll is missing, openh264 support will be disabled
To enable it, please install libopenh264 package, which is licensed under http://www.openh264.org/BINARY_LICENSE.txt.
Input #0, matroska,webm, from 'file_example_MP4_1920_18MG.mkv':
  Metadata:
    encoder         : libebml v1.4.5 + libmatroska v1.7.1
    creation_time   : 2026-05-25T00:02:37.000000Z
  Duration: 00:00:30.03, start: 0.000000, bitrate: 4746 kb/s
  Stream #0:0: Video: h264 (High), none(bt709, progressive), 1920x1080, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn (default)
    Metadata:
      BPS             : 4486763
      DURATION        : 00:00:30.033000000
      NUMBER_OF_FRAMES: 901
      NUMBER_OF_BYTES : 16843872
      _STATISTICS_WRITING_APP: mkvmerge v98.0 ('Chonks') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:02:37
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp (default)
    Metadata:
      BPS             : 256000
      DURATION        : 00:00:30.016000000
      NUMBER_OF_FRAMES: 1407
      NUMBER_OF_BYTES : 960512
      _STATISTICS_WRITING_APP: mkvmerge v98.0 ('Chonks') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:02:37
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
File 'out.mkv' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Output #0, matroska, to 'out.mkv':
  Metadata:
    encoder         : Lavf62.12.101
  Stream #0:0: Video: h264 (High) (H264 / 0x34363248), none(bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 30 fps, 30 tbr, 1k tbn (default)
    Metadata:
      BPS             : 4486763
      DURATION        : 00:00:30.033000000
      NUMBER_OF_FRAMES: 901
      NUMBER_OF_BYTES : 16843872
      _STATISTICS_WRITING_APP: mkvmerge v98.0 ('Chonks') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:02:37
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp (default)
    Metadata:
      BPS             : 256000
      DURATION        : 00:00:30.016000000
      NUMBER_OF_FRAMES: 1407
      NUMBER_OF_BYTES : 960512
      _STATISTICS_WRITING_APP: mkvmerge v98.0 ('Chonks') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:02:37
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Press [q] to stop, [?] for help
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 66 PTS: 33, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 198 PTS: 167, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 330 PTS: 300, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 462 PTS: 433, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 594 PTS: 567, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 726 PTS: 700, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 858 PTS: 833, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 990 PTS: 967, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 1122 PTS: 1100, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 1254 PTS: 1233, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 1452 PTS: 1433, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Invalid DTS: 1584 PTS: 1567, replacing by guess
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 1733, current: 1700; changing to 1733. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 1867, current: 1833; changing to 1867. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 2000, current: 1967; changing to 2000. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 2133, current: 2100; changing to 2133. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 2267, current: 2233; changing to 2267. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 2400, current: 2367; changing to 2400. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 2533, current: 2500; changing to 2533. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 2667, current: 2633; changing to 2667. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 2800, current: 2767; changing to 2800. This may result in incorrect timestamps in the output file.
[vost#0:0/copy @ 0xa00061e80] Non-monotonic DTS; previous: 2933, current: 2900; changing to 2933. This may result in incorrect timestamps in the output file.
.
.
*(redacted for brevity)*
.
.
[out#0/matroska @ 0xa0005c780] video:16449KiB audio:938KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.101318%
frame=  901 fps=0.0 q=-1.0 Lsize=   17405KiB time=00:00:30.00 bitrate=4752.6kbits/s speed=1.17e+03x elapsed=0:00:00.02

On Windows native build:

ffmpeg version 8.1.1-essentials_build-www.gyan.dev Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 15.2.0 (Rev13, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-cairo --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-openal --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex
  --enable-libvorbis --enable-librubberband
  libavutil      60. 26.101 / 60. 26.101
  libavcodec     62. 28.101 / 62. 28.101
  libavformat    62. 12.101 / 62. 12.101
  libavdevice    62.  3.101 / 62.  3.101
  libavfilter    11. 14.101 / 11. 14.101
  libswscale      9.  5.101 /  9.  5.101
  libswresample   6.  3.101 /  6.  3.101
Input #0, matroska,webm, from 'file_example_MP4_1920_18MG.mkv':
  Metadata:
    encoder         : libebml v1.4.5 + libmatroska v1.7.1
    creation_time   : 2026-05-25T00:02:37.000000Z
  Duration: 00:00:30.03, start: 0.000000, bitrate: 4746 kb/s
  Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 1k tbn (default)
    Metadata:
      BPS             : 4486763
      DURATION        : 00:00:30.033000000
      NUMBER_OF_FRAMES: 901
      NUMBER_OF_BYTES : 16843872
      _STATISTICS_WRITING_APP: mkvmerge v98.0 ('Chonks') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:02:37
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp (default)
    Metadata:
      BPS             : 256000
      DURATION        : 00:00:30.016000000
      NUMBER_OF_FRAMES: 1407
      NUMBER_OF_BYTES : 960512
      _STATISTICS_WRITING_APP: mkvmerge v98.0 ('Chonks') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:02:37
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
File 'out.mkv' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Output #0, matroska, to 'out.mkv':
  Metadata:
    encoder         : Lavf62.12.101
  Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 30 fps, 30 tbr, 1k tbn (default)
    Metadata:
      BPS             : 4486763
      DURATION        : 00:00:30.033000000
      NUMBER_OF_FRAMES: 901
      NUMBER_OF_BYTES : 16843872
      _STATISTICS_WRITING_APP: mkvmerge v98.0 ('Chonks') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:02:37
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp (default)
    Metadata:
      BPS             : 256000
      DURATION        : 00:00:30.016000000
      NUMBER_OF_FRAMES: 1407
      NUMBER_OF_BYTES : 960512
      _STATISTICS_WRITING_APP: mkvmerge v98.0 ('Chonks') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:02:37
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Press [q] to stop, [?] for help
[out#0/matroska @ 000001765f1fe440] video:16449KiB audio:938KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.101385%
frame=  901 fps=0.0 q=-1.0 Lsize=   17405KiB time=00:00:29.96 bitrate=4758.0kbits/s speed=2.08e+03x elapsed=0:00:00.01

On Linux:

ffmpeg version 8.1.1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 13 (Ubuntu 13.3.0-6ubuntu2~24.04.1)
  configuration: --disable-decoder=amrnb --disable-gnutls --disable-liblensfun --disable-libopencv --disable-podpages --disable-sndio --disable-stripping --enable-avfilter --enable-chromaprint --enable-frei0r --enable-gcrypt --enable-gpl --enable-ladspa --enable-libaom --enable-libaribb24 --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libdc1394 --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librabbitmq --enable-librist --enable-librsvg --enable-librubberband --enable-libshine --enable-libsmbc
 lient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-nonfree --enable-openal --enable-opencl --enable-opengl --enable-openssl --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-vaapi --enable-libvpl --enable-libxavs2 --enable-libdavs2 --enable-libvmaf --enable-librav1e --enable-libvvenc --enable-libilbc --enable-libklvanc --enable-libfdk-aac --enable-libkvazaar --enable-omx --cc=x86_64-linux-gnu-gcc --cxx=x86_64-linux-gnu-g++ --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  libavutil      60. 26.101 / 60. 26.101
  libavcodec     62. 28.101 / 62. 28.101
  libavformat    62. 12.101 / 62. 12.101
  libavdevice    62.  3.101 / 62.  3.101
  libavfilter    11. 14.101 / 11. 14.101
  libswscale      9.  5.101 /  9.  5.101
  libswresample   6.  3.101 /  6.  3.101
Input #0, matroska,webm, from 'file_example_MP4_1920_18MG.mkv':
  Metadata:
    encoder         : libebml v1.4.5 + libmatroska v1.7.1
    creation_time   : 2026-05-25T00:41:46.000000Z
  Duration: 00:00:30.53, start: 0.000000, bitrate: 4674 kb/s
  Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 1k tbn (default)
    Metadata:
      BPS             : 4486763
      DURATION        : 00:00:30.033000000
      NUMBER_OF_FRAMES: 901
      NUMBER_OF_BYTES : 16843872
      _STATISTICS_WRITING_APP: mkvmerge v82.0 ('I'm The President') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:41:46
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp (default)
    Metadata:
      BPS             : 256000
      DURATION        : 00:00:30.528000000
      NUMBER_OF_FRAMES: 1431
      NUMBER_OF_BYTES : 976896
      _STATISTICS_WRITING_APP: mkvmerge v82.0 ('I'm The President') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:41:46
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
File 'out.mkv' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Output #0, matroska, to 'out.mkv':
  Metadata:
    encoder         : Lavf62.12.101
  Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 30 fps, 30 tbr, 1k tbn (default)
    Metadata:
      BPS             : 4486763
      DURATION        : 00:00:30.033000000
      NUMBER_OF_FRAMES: 901
      NUMBER_OF_BYTES : 16843872
      _STATISTICS_WRITING_APP: mkvmerge v82.0 ('I'm The President') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:41:46
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp (default)
    Metadata:
      BPS             : 256000
      DURATION        : 00:00:30.528000000
      NUMBER_OF_FRAMES: 1431
      NUMBER_OF_BYTES : 976896
      _STATISTICS_WRITING_APP: mkvmerge v82.0 ('I'm The President') 64-bit
      _STATISTICS_WRITING_DATE_UTC: 2026-05-25 00:41:46
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Press [q] to stop, [?] for help
[out#0/matroska @ 0x5d93cc7a2580] video:16449KiB audio:954KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.102358%
frame=  901 fps=0.0 q=-1.0 Lsize=   17421KiB time=00:00:29.96 bitrate=4762.5kbits/s speed= 354x elapsed=0:00:00.08


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