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. 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".
