On 12/17/19, Carl Eugen Hoyos <[email protected]> wrote: > Am Di., 17. Dez. 2019 um 14:26 Uhr schrieb Carl Eugen Hoyos > <[email protected]>: >> >> Am Di., 17. Dez. 2019 um 14:18 Uhr schrieb Alberto Mattea >> <[email protected]>: >> > >> > Hi all, I'm trying to losslessly convert some videos from grassvalley >> > hqx to ffv1. >> > Unfortunately it seems the conversion is not really lossless, as the >> > frames md5 changes after the conversion. >> > Here's what I'm doing: >> > >> > - Calculate md5 of the original video frames >> > >> > $ ffmpeg -i 01.avi -f framemd5 orig.framemd5 >> > ffmpeg version N-51066-ge52070e89c-static >> > https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2019 the FFmpeg >> > developers >> > built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516 >> > configuration: --enable-gpl --enable-version3 --enable-static >> > --disable-debug --disable-ffplay --disable-indev=sndio >> > --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r >> > --enable-gnutls --enable-gmp --enable-libgme --enable-gray >> > --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf >> > --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb >> > --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband >> > --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis >> > --enable-libopus --enable-libtheora --enable-libvidstab >> > --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp >> > --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d >> > --enable-libxvid --enable-libzvbi --enable-libzimg >> > libavutil 56. 36.101 / 56. 36.101 >> > libavcodec 58. 65.100 / 58. 65.100 >> > libavformat 58. 35.101 / 58. 35.101 >> > libavdevice 58. 9.101 / 58. 9.101 >> > libavfilter 7. 68.100 / 7. 68.100 >> > libswscale 5. 6.100 / 5. 6.100 >> > libswresample 3. 6.100 / 3. 6.100 >> > libpostproc 55. 6.100 / 55. 6.100 >> > Input #0, avi, from '01.avi': >> > Duration: 00:15:04.40, start: 0.000000, bitrate: 202751 kb/s >> > Stream #0:0: Video: hqx (CHQX / 0x58514843), yuv422p16le(10 bpc, >> > progressive), 1632x1200 [SAR 1:1 DAR 34:25], 202756 kb/s, 25 fps, 25 >> > tbr, 25 tbn, 25 tbc >> > Stream mapping: >> > Stream #0:0 -> #0:0 (hqx (native) -> rawvideo (native)) >> > Press [q] to stop, [?] for help >> > Output #0, framemd5, to 'orig.framemd5': >> > Metadata: >> > encoder : Lavf58.35.101 >> > Stream #0:0: Video: rawvideo (Y3[10][16] / 0x100A3359), >> > yuv422p16le(10 bpc), 1632x1200 [SAR 1:1 DAR 34:25], q=2-31, 1566720 >> > kb/s, 25 fps, 25 tbn, 25 tbc >> > Metadata: >> > encoder : Lavc58.65.100 rawvideo >> > frame=22610 fps= 50 q=-0.0 Lsize= 1767kB time=00:15:04.40 bitrate= >> > 16.0kbits/s speed=1.98x >> > video:172966500kB audio:0kB subtitle:0kB other streams:0kB global >> > headers:0kB muxing overhead: unknown >> > >> > - Convert >> > >> > $ ffmpeg -i 01.avi -c:v ffv1 01ffv1.mkv >> > ffmpeg version N-51066-ge52070e89c-static >> > https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2019 the FFmpeg >> > developers >> > built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516 >> > configuration: --enable-gpl --enable-version3 --enable-static >> > --disable-debug --disable-ffplay --disable-indev=sndio >> > --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r >> > --enable-gnutls --enable-gmp --enable-libgme --enable-gray >> > --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf >> > --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb >> > --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband >> > --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis >> > --enable-libopus --enable-libtheora --enable-libvidstab >> > --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp >> > --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d >> > --enable-libxvid --enable-libzvbi --enable-libzimg >> > libavutil 56. 36.101 / 56. 36.101 >> > libavcodec 58. 65.100 / 58. 65.100 >> > libavformat 58. 35.101 / 58. 35.101 >> > libavdevice 58. 9.101 / 58. 9.101 >> > libavfilter 7. 68.100 / 7. 68.100 >> > libswscale 5. 6.100 / 5. 6.100 >> > libswresample 3. 6.100 / 3. 6.100 >> > libpostproc 55. 6.100 / 55. 6.100 >> > Input #0, avi, from '01.avi': >> > Duration: 00:15:04.40, start: 0.000000, bitrate: 202751 kb/s >> > Stream #0:0: Video: hqx (CHQX / 0x58514843), yuv422p16le(10 bpc, >> > progressive), 1632x1200 [SAR 1:1 DAR 34:25], 202756 kb/s, 25 fps, 25 >> > tbr, 25 tbn, 25 tbc >> > Stream mapping: >> > Stream #0:0 -> #0:0 (hqx (native) -> ffv1 (native)) >> > Press [q] to stop, [?] for help >> > [ffv1 @ 0x6e1ce80] bits_per_raw_sample > 8, forcing range coder >> > Output #0, matroska, to '01ffv1.mkv': >> > Metadata: >> > encoder : Lavf58.35.101 >> > Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p16le(10 bpc), >> > 1632x1200 [SAR 1:1 DAR 34:25], q=2-31, 200 kb/s, 25 fps, 1k tbn, 25 tbc >> > Metadata: >> > encoder : Lavc58.65.100 ffv1 >> > frame=22610 fps= 17 q=-0.0 Lsize=35631195kB time=00:15:04.36 >> > bitrate=322759.1kbits/s speed=0.691x >> > video:35630872kB audio:0kB subtitle:0kB other streams:0kB global >> > headers:0kB muxing overhead: 0.000908% >> > >> > - Calculate md5 of the converted frames (I've stopped it after a few >> > hundred frames, just to check the beginning) >> > >> > $ ffmpeg -i 01ffv1.mkv -f framemd5 converted.framemd5 >> > ffmpeg version N-51066-ge52070e89c-static >> > https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2019 the FFmpeg >> > developers >> > built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516 >> > configuration: --enable-gpl --enable-version3 --enable-static >> > --disable-debug --disable-ffplay --disable-indev=sndio >> > --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r >> > --enable-gnutls --enable-gmp --enable-libgme --enable-gray >> > --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf >> > --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb >> > --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband >> > --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis >> > --enable-libopus --enable-libtheora --enable-libvidstab >> > --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp >> > --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d >> > --enable-libxvid --enable-libzvbi --enable-libzimg >> > libavutil 56. 36.101 / 56. 36.101 >> > libavcodec 58. 65.100 / 58. 65.100 >> > libavformat 58. 35.101 / 58. 35.101 >> > libavdevice 58. 9.101 / 58. 9.101 >> > libavfilter 7. 68.100 / 7. 68.100 >> > libswscale 5. 6.100 / 5. 6.100 >> > libswresample 3. 6.100 / 3. 6.100 >> > libpostproc 55. 6.100 / 55. 6.100 >> > Input #0, matroska,webm, from '01ffv1.mkv': >> > Metadata: >> > ENCODER : Lavf58.35.101 >> > Duration: 00:15:04.40, start: 0.000000, bitrate: 322745 kb/s >> > Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p10le, >> > 1632x1200, SAR 1:1 DAR 34:25, 25 fps, 25 tbr, 1k tbn, 1k tbc (default) >> > Metadata: >> > ENCODER : Lavc58.65.100 ffv1 >> > DURATION : 00:15:04.400000000 >> > Stream mapping: >> > Stream #0:0 -> #0:0 (ffv1 (native) -> rawvideo (native)) >> > Press [q] to stop, [?] for help >> > Output #0, framemd5, to 'converted.framemd5': >> > Metadata: >> > encoder : Lavf58.35.101 >> > Stream #0:0: Video: rawvideo (Y3[10][10] / 0xA0A3359), yuv422p10le, >> > 1632x1200 [SAR 1:1 DAR 34:25], q=2-31, 979200 kb/s, 25 fps, 25 tbn, 25 >> > tbc (default) >> > Metadata: >> > DURATION : 00:15:04.400000000 >> > encoder : Lavc58.65.100 rawvideo >> > frame= 406 fps= 31 q=-0.0 Lsize= 32kB time=00:00:16.24 bitrate= >> > 16.1kbits/s speed=1.23x >> > video:3105900kB audio:0kB subtitle:0kB other streams:0kB global >> > headers:0kB muxing overhead: unknown >> > >> > - Compare hashes >> > >> > orig.framemd5: >> > #format: frame checksums >> > #version: 2 >> > #hash: MD5 >> > #software: Lavf58.35.101 >> > #tb 0: 1/25 >> > #media_type 0: video >> > #codec_id 0: rawvideo >> > #dimensions 0: 1632x1200 >> > #sar 0: 1/1 >> > #stream#, dts, pts, duration, size, hash >> > 0, 0, 0, 1, 7833600, >> > 39d64300c8b749b0776423a80746d8dc >> > 0, 1, 1, 1, 7833600, >> > 12e7317d49727740187d2e23439d87d8 >> > 0, 2, 2, 1, 7833600, >> > 12e7317d49727740187d2e23439d87d8 >> > 0, 3, 3, 1, 7833600, >> > 0b3b0136b008ec9d67e900595be0c923 >> > 0, 4, 4, 1, 7833600, >> > 97cd9b7689d1f49d1e1988a3613ffa72 >> > 0, 5, 5, 1, 7833600, >> > 97cd9b7689d1f49d1e1988a3613ffa72 >> > 0, 6, 6, 1, 7833600, >> > 1632e4b3ba7dc28e9dde698f3b7ec9e7 >> > 0, 7, 7, 1, 7833600, >> > 796bda137d768f4ad31eb7166ea16447 >> > 0, 8, 8, 1, 7833600, >> > 796bda137d768f4ad31eb7166ea16447 >> > 0, 9, 9, 1, 7833600, >> > 612c13b4824bd427faa51efa7a09660d >> > ... >> > >> > converted.framemd5: >> > #format: frame checksums >> > #version: 2 >> > #hash: MD5 >> > #software: Lavf58.35.101 >> > #tb 0: 1/25 >> > #media_type 0: video >> > #codec_id 0: rawvideo >> > #dimensions 0: 1632x1200 >> > #sar 0: 1/1 >> > #stream#, dts, pts, duration, size, hash >> > 0, 0, 0, 1, 7833600, >> > 3ed693fc02ba36cca92a2153afa960ac >> > 0, 1, 1, 1, 7833600, >> > 23d7482899eb8c854b26444dcdf38db4 >> > 0, 2, 2, 1, 7833600, >> > 23d7482899eb8c854b26444dcdf38db4 >> > 0, 3, 3, 1, 7833600, >> > 1fc392823ebc14001ee0e44c68d710e6 >> > 0, 4, 4, 1, 7833600, >> > d63335f1c34132680e571549da51eac7 >> > 0, 5, 5, 1, 7833600, >> > d63335f1c34132680e571549da51eac7 >> > 0, 6, 6, 1, 7833600, >> > 09304bca4578458c353ecc119de0bd87 >> > 0, 7, 7, 1, 7833600, >> > 0ec1e49008d1f70385dc4a1636559a30 >> > 0, 8, 8, 1, 7833600, >> > 0ec1e49008d1f70385dc4a1636559a30 >> > 0, 9, 9, 1, 7833600, >> > 78b22236d03517e5ceea3bd390ac2d0b >> > ... >> > >> > Any idea of why this is happening? >> >> The input has 10 bit precision, therefore only 10 bit are encoded. > > The more difficult question is how big hqx precision really is: > The original commit specified 10 bit, but a comment in the code (same > commit) > indicates 12 bit.
Idct output is padded by 4 bits with upper bits of 12bit idct output. > Carl Eugen > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
