ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 6.3.0 (Alpine 6.3.0) configuration: --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libvpx --enable-libvorbis --enable-libopus --enable-libfreetype --enable-gnutls libavutil 55. 78.100 / 55. 78.100 libavcodec 57.107.100 / 57.107.100 libavformat 57. 83.100 / 57. 83.100 libavdevice 57. 10.100 / 57. 10.100 libavfilter 6.107.100 / 6.107.100 libswscale 4. 8.100 / 4. 8.100 libswresample 2. 9.100 / 2. 9.100 libpostproc 54. 7.100 / 54. 7.100 Splitting the commandline. Reading option '-v' ... matched as option 'v' (set logging level) with argument '9'. Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '99'. Reading option '-i' ... matched as input url with argument '/home/h264_pix_fmt_444.mkv'. Finished splitting the commandline. Parsing a group of options: global . Applying option v (set logging level) with argument 9. Successfully parsed a group of options. Parsing a group of options: input url /home/h264_pix_fmt_444.mkv. Successfully parsed a group of options. Opening an input file: /home/h264_pix_fmt_444.mkv. [NULL @ 0x55b8c3003ec0] Opening '/home/h264_pix_fmt_444.mkv' for reading [file @ 0x55b8c3004540] Setting default whitelist 'file,crypto' Probing matroska,webm score:100 size:2048 [matroska,webm @ 0x55b8c3003ec0] Format matroska,webm probed with size=2048 and score=100 st:0 removing common factor 1000000 from timebase st:1 removing common factor 1000000 from timebase st:2 removing common factor 1000000 from timebase [matroska,webm @ 0x55b8c3003ec0] Before avformat_find_stream_info() pos: 16994 bytes read:32768 seeks:0 nb_streams:3 [h264 @ 0x55b8c30092e0] nal_unit_type: 7, nal_ref_idc: 3 [h264 @ 0x55b8c30092e0] nal_unit_type: 8, nal_ref_idc: 3 [h264 @ 0x55b8c30092e0] nal_unit_type: 7, nal_ref_idc: 3 [h264 @ 0x55b8c30092e0] nal_unit_type: 8, nal_ref_idc: 3 [h264 @ 0x55b8c30092e0] nal_unit_type: 6, nal_ref_idc: 0  Last message repeated 1 times Last message repeated 2 times Last message repeated 2 times [h264 @ 0x55b8c30092e0] nal_unit_type: 5, nal_ref_idc: 3 [h264 @ 0x55b8c30092e0] Reinit context to 1920x1088, pix_fmt: yuv444p10le [h264 @ 0x55b8c30092e0] no picture [h264 @ 0x55b8c30092e0] gray chroma [h264 @ 0x55b8c30092e0] error while decoding MB 25 10, bytestream 153885 [h264 @ 0x55b8c30092e0] concealing 6984 DC, 6984 AC, 6984 MV errors in I frame [matroska,webm @ 0x55b8c3003ec0] All info found [matroska,webm @ 0x55b8c3003ec0] stream 0: start_time: 0.000 duration: -9223372036854776.000 [matroska,webm @ 0x55b8c3003ec0] stream 1: start_time: 0.000 duration: -9223372036854776.000 [matroska,webm @ 0x55b8c3003ec0] stream 2: start_time: 0.000 duration: 5.088 [matroska,webm @ 0x55b8c3003ec0] format: start_time: 0.000 duration: 5.088 bitrate=3853 kb/s [matroska,webm @ 0x55b8c3003ec0] After avformat_find_stream_info() pos: 446280 bytes read:456025 seeks:0 frames:5 Input #0, matroska,webm, from '/home/h264_pix_fmt_444.mkv': Metadata: ENCODER : Lavf57.56.101 Duration: 00:00:05.09, start: 0.000000, bitrate: 3853 kb/s Stream #0:0(jpn), 4, 1/1000: Video: h264 (High 4:4:4 Predictive), 1 reference frame, yuv444p10le(tv, bt709, progressive, left), 1920x1080 (1920x1088), 0/1, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default) Metadata: BPS : 6436165 BPS-eng : 6436165 DURATION-eng : 00:23:42.088000000 NUMBER_OF_FRAMES: 34096 NUMBER_OF_FRAMES-eng: 34096 NUMBER_OF_BYTES : 1144099142 NUMBER_OF_BYTES-eng: 1144099142 _STATISTICS_WRITING_APP: mkvmerge v10.0.0 ('To Drown In You') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v10.0.0 ('To Drown In You') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-03-25 23:48:31 _STATISTICS_WRITING_DATE_UTC-eng: 2017-03-25 23:48:31 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES DURATION : 00:00:05.088000000 Stream #0:1(jpn), 1, 1/1000: Audio: flac, 48000 Hz, stereo, s32 (24 bit) (default) Metadata: BPS : 1479843 BPS-eng : 1479843 DURATION-eng : 00:23:42.090000000 NUMBER_OF_FRAMES: 16666 NUMBER_OF_FRAMES-eng: 16666 NUMBER_OF_BYTES : 263058808 NUMBER_OF_BYTES-eng: 263058808 _STATISTICS_WRITING_APP: mkvmerge v10.0.0 ('To Drown In You') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v10.0.0 ('To Drown In You') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-03-25 23:48:31 _STATISTICS_WRITING_DATE_UTC-eng: 2017-03-25 23:48:31 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES DURATION : 00:00:05.034000000 Stream #0:2(spa), 0, 1/1000: Subtitle: ass (default) Metadata: BPS : 16370 BPS-eng : 16370 DURATION-eng : 00:22:42.660000000 NUMBER_OF_FRAMES: 8163 NUMBER_OF_FRAMES-eng: 8163 NUMBER_OF_BYTES : 2788473 NUMBER_OF_BYTES-eng: 2788473 _STATISTICS_WRITING_APP: mkvmerge v10.0.0 ('To Drown In You') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v10.0.0 ('To Drown In You') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-03-25 23:48:31 _STATISTICS_WRITING_DATE_UTC-eng: 2017-03-25 23:48:31 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES DURATION : 00:00:00.000000000 Successfully opened the file. At least one output file must be specified [AVIOContext @ 0x55b8c300c6c0] Statistics: 456025 bytes read, 0 seeks