Re: [FFmpeg-user] Crop between 0:02 & 1:02 a MP4+AAC MKV with less processing
Is that the most efficient way to do so? If to be less taxing on the system there's a few seconds pre-pended to it (ie: 5 seconds would be at 57 seconds), it's fine with me; the video is > 1 hr long, so even 30 seconds pre-pended isn't an issue. Since my question was cropped, here it is w/o the MediaInfo part: > In a MP4 + AAC with a MKV wrapper video, which information is appended, > it's 1st 2 seconds contain sensitive information so it must be cropped. The > next minute is useless content, something that if it remained would almost > constantly be skipped. So the ideal beginning is 1:02, but as long as it's > neither 0:00 nor 0:01 I can live with it. With that considered, what's a > good cropping method amongst those that would take the least processing > possible? ie: Some search pattern would start from 1:02 going toward the > beginning, and when a point that would make cropping easier would be 1st > reached, the crop would happen there. > > If something was unclear, please quote the precise section and I'll try to > rephrase it. > > Thank you kindly > On Sun, Dec 20, 2020 at 1:24 PM adam smith via ffmpeg-user < ffmpeg-user@ffmpeg.org> wrote: > If you want it to start 62 seconds into the source, use -ss 62 > > Eg ffmpeg -i input.mkv -ss 62 -vcodec copy -acodec copy output.mkv > > Adam > > > On 19 Dec 2020, at 11:59, DynV Montrealer wrote: > > > > So the ideal beginning is 1:02 > ___ > 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". ___ 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".
Re: [FFmpeg-user] Crop between 0:02 & 1:02 a MP4+AAC MKV with less processing
If you want it to start 62 seconds into the source, use -ss 62 Eg ffmpeg -i input.mkv -ss 62 -vcodec copy -acodec copy output.mkv Adam > On 19 Dec 2020, at 11:59, DynV Montrealer wrote: > > So the ideal beginning is 1:02 ___ 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".
[FFmpeg-user] Crop between 0:02 & 1:02 a MP4+AAC MKV with less processing
In a MP4 + AAC with a MKV wrapper video, which information is appended, it's 1st 2 seconds contain sensitive information so it must be cropped. The next minute is useless content, something that if it remained would almost constantly be skipped. So the ideal beginning is 1:02, but as long as it's neither 0:00 nor 0:01 I can live with it. With that considered, what's a good cropping method amongst those that would take the least processing possible? ie: Some search pattern would start from 1:02 going toward the beginning, and when a point that would make cropping easier would be 1st reached, the crop would happen there. If something was unclear, please quote the precise section and I'll try to rephrase it. Thank you kindly From MediaInfo: > General > Unique ID: > 44770505906429735175387722404957018575 (0x21AE7C5D10957DEAA4B80712D2A859CF) > Complete name: > C:\Users\MY_USER_NAME\Videos\2020-12-18 13-05-53.mkv > Format : Matroska > Format version : Version 4 > File size: 188 MiB > Duration : 44 min 32 s > Overall bit rate : 590 kb/s > Writing application : Lavf58.29.100 > Writing library : Lavf58.29.100 > ErrorDetectionType : Per level 1 > > Video > ID : 1 > Format : AVC > Format/Info : Advanced Video Codec > Format profile : High@L3.1 > Format settings : CABAC / 4 Ref Frames > Format settings, CABAC : Yes > Format settings, Reference frames: 4 frames > Codec ID : V_MPEG4/ISO/AVC > Duration : 44 min 32 s > Width: 1 280 pixels > Height : 720 pixels > Display aspect ratio : 16:9 > Frame rate mode : Constant > Frame rate : 30.000 FPS > Color space : YUV > Chroma subsampling : 4:2:0 > Bit depth: 8 bits > Scan type: Progressive > Writing library : x264 core 161 r3020 d198931 > Encoding settings: cabac=1 / ref=1 / deblock=1:0:0 > / analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / > mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / > deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=6 / > lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / > bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 > / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / > keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=crf / > mbtree=1 / crf=14.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / > ip_ratio=1.40 / aq=1:1.00 > Default : Yes > Forced : No > Color range : Limited > Color primaries : BT.709 > Transfer characteristics : BT.709 > Matrix coefficients : BT.709 > > Audio > ID : 2 > Format : AAC LC > Format/Info : Advanced Audio Codec Low > Complexity > Codec ID : A_AAC-2 > Duration : 44 min 32 s > Channel(s) : 2 channels > Channel layout : L R > Sampling rate: 48.0 kHz > Frame rate : 46.875 FPS (1024 SPF) > Compression mode : Lossy > Title: simple_aac_recording > Default : Yes > Forced : No > ___ 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".
