Dear Mailing list peers! I am currently using ffmpeg in order to produce screenshots of each new scene in archival footage. The name of the screenshot is supposed to include the framcount and I want to make a screenshot 3 frames after the cut so my commandline looks like this:
ffmpeg -i WESTERBORK_2019_progres.mov -filter:v "select=if(gt(scene\,0.13)\,st(1\,n)-n\,if(ld(1)\,eq(n\,ld(1)+3))),showinfo" -vsync vfr Westerbork_Film_%05d.jpg Even though this worked the last two films with my current material I get a stange output. The timecode in the name is roughly 4% higher that the one I burnt in to the videofile (for orientation). Examples: Westerbork_Film_6479.jpg: Westerbork_Film_2157.jpg: This happens with every version (I remuxed the file in mkv toolnix and speded it down to 16 fps and to 25fps) I made. So, even though I doubt it will help, here’s the media info of the file. It’s a silent film; the file is an export from Davinci resolve where I added the frame count: General Complete name : WESTERBORK_2019_progres.mov Format : MPEG-4 Format profile : QuickTime Codec ID : qt 0000.02 (qt ) File size : 8.90 GiB Duration : 1 h 12 min Overall bit rate mode : Variable Overall bit rate : 17.6 Mb/s Encoded date : UTC 2021-06-04 18:51:26 Tagged date : UTC 2021-06-04 18:51:26 Writing application : Blackmagic Design DaVinci Resolve Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4 Format settings : CABAC / 2 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 2 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 1 h 12 min Bit rate mode : Variable Bit rate : 17.3 Mb/s Maximum bit rate : 768 kb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 25.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.333 Stream size : 8.74 GiB (98%) Encoded date : UTC 2021-06-04 18:51:26 Tagged date : UTC 2021-06-04 18:51:26 Color range : Limited Color primaries : BT.709 Matrix coefficients : BT.709 Codec configuration box : avcC Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 1 h 12 min Bit rate mode : Constant Bit rate : 320 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 166 MiB (2%) Default : Yes Alternate group : 1 Encoded date : UTC 2021-06-04 18:51:26 Tagged date : UTC 2021-06-04 18:51:26 Other ID : 3 Type : Time code Format : QuickTime TC Duration : 1 h 12 min Frame rate : 25.000 FPS Time code of first frame : 01:00:00:00 Time code, striped : Yes Language : English Default : No Encoded date : UTC 2021-06-04 18:51:26 Tagged date : UTC 2021-06-04 18:51:26 Looking forward to hear any tips or comments. Also one more question to the experts: Sometimes ffmepg puts out the frame count in the name with 000 in front and sometimes not. I guess it has something to do with the %05d or %d in the end. Where can I find an explanation how this works? Kind regards Fabian __ PhD candidate at Filmuniversität Babelsberg, Germany latest publication: http://www.apparatusjournal.net/index.php/apparatus/article/view/223/515 new research project: VHH - Visual History of the Holocaust: Rethinking Curation in the Digital Age <https://ef.huji.ac.il/book/vhh-visual-history-holocaust-rethinking-curation-digital-age> currently working for Ludwig Boltzmann Institute for Digital History (LBIDH) <https://geschichte.lbg.ac.at/team/fabian-schmidt>and Filmuniversität Babelsberg KONRAD WOLF upcoming research project: DFG-Filmikonen <https://www.filmuniversitaet.de/filmuni/aktuelles/news/artikel/detail/filmbilder-aus-der-nazizeit-im-fokus> filmproject: Atrocity Film <http://blog.atrocityfilm.com/> IMDB <https://www.imdb.com/name/nm1144289/> Fabian Schmidt Husemannstr. 12 10435 Berlin 0049 0172 3256513 _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
