177 lines
6.2 KiB
Markdown
177 lines
6.2 KiB
Markdown
# Media (General)
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## Audio
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### Split file with cue sheet and use filename from cue sheet
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:::shell
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shnsplit -D -f file.cue -t "%n %t" -o "flac flac -8 -o %f -" file.flac
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To directly encode to opuus:
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:::shell
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shnsplit -D -f file.cue -t "%n %t" -o "cust ext=opus opusenc --bitrate=160k - %f" file.flac
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### Remove all tags except MusicBrainz tags from flac files
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:::shell
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for i in *.flac; do tags=$(metaflac --export-tags-to=- $i | grep -E '^MUSICBRAINZ_'); metaflac --remove-all-tags $i; metaflac --import-tags-from=- $i <<< $tags; done
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### Downmix 5.1/7.1 to 2.0
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:::shell
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mpv --oac=flac --audio-channels=stereo --oacopts=compression_level=0 --o=outfile.flac infile.flac
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### Record pulseaudio device to flac
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:::shell
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parec [ -d DEVICE ] | flac --endian=little --channels=2 --bps=16 --sample-rate=48000 --sign=signed -o foo.flac -
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### Copy Matroska Chapters to Opus
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Requires the metadata to fit in one ogg page (so no cover art :().
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:::shell
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mkvextract file.mka chapters | xq -r 'def pad: tostring | (3 - length) as $l | ("0" * $l)[:$l] + .; [[.Chapters.EditionEntry.ChapterAtom[] | {start: .ChapterTimeStart, name: .ChapterDisplay.ChapterString}] | to_entries[] | "CHAPTER\(.key|pad)=\(.value.start)\nCHAPTER\(.key|pad)NAME=\(.value.name)"] | join("\n")' | opustags -i -S file.opus
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## Video
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### Copy DVD stream to file [with dvd already copied to local directory]
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:::shell
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mpv --stream-dump=1.mkv dvd://1 [--dvd-device path/to/dvd]
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## Images
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### Apply EXIF rotation to JPEG images
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Requires `jhead` and `jpegtran`.
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:::shell
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nix shell nixpkgs#jhead nixpkgs#libjpeg.bin
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jhead -ft -autorot *.JPG
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## MKV
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### Fix mimetype of font attachments
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Some matroska files have the mimetype for font attachment for fonts set to
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`application/octet-strem`.
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:::shell
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mkvpropedit --attachment-mime-type font/sfnt --update-attachment mime-type:application/octet-stream file.mkv
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## FFmpeg
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### Create color timeline image from video
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:::shell
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(infile=in.mkv; outfile=out.png; rows=320; width=1920; height=1080; ffmpeg -i $infile -vf tblend=all_mode=average,fps=${rows}/$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 $infile),scale=1:1,scale=${width}/${rows}:${height},setsar=1,tile=${rows}x1 -frames:v 1 $outfile)
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### Show duration of file in seconds
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:::shell
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ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 file.mkv
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### Remove EIA-608 subtitles from video bitstream
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([source](https://stackoverflow.com/a/51439554))
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:::shell
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ffmpeg -i infile.mkv -c copy -bsf:v "filter_units=remove_types=6" outfile.mkv
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## QP file
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replace 24/1.001 with framerate
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:::shell
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ffprobe -i infile.mkv -print_format json -show_chapters -loglevel error | jq -r '.chapters[].start / 1000000000 * 24/1.001 | round | tostring + " I"' >> foo.qp
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## Manga
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### Convert greyscale images to actuual greyscale
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For some reasons, many releases encode greyscale manga pages as yuv420. Sadly,
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the chroma layers are not completely empty but include some (almost invisible)
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noise. This fixes that for lower battery comsumption, a really small file size
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gain and just because it seems right.
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This only works for pages with the same size (image2/ffmpeg limitation), but
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releases suffering from this mostly fulfill this requirement.
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**WARNING**: This uses some heuristics (SSIM > 98) to determine if a page is
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greyscale. This may not work all the time (it did for me though). Please verify
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if all converted images actually are greyscale.
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:::shell
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ffmpeg -loglevel error -f lavfi -i "movie=%03d.jpg:f=image2,split=2[orig][in2];[in2]extractplanes=y[grey];[orig][grey]ssim=-" -f null - >> ssim
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while read frame;do (( $(cut -d' ' -f5 <<< $frame | cut -c 7-8) < 98 )) || {file=$(printf "%03d.jpg\n" $(cut -d' ' -f1 <<< $frame|cut -d: -f2)); echo $file; jpegtran -copy none -optimize -grayscale -outfile $file $file}; done < ssim
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jpegoptim -s *.jpg
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exiftool -overwrite_original -all= *.jpg
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# print all converted images for verification
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grep -E 'All:0.(9[0-8]|[0-8][0-9])' ssim
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### Merge page spreads to single page
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Use function `merge_pages right-page left-page` (without .jpg). Result will be
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written to left-page-right-page.jpg`.
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:::shell
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function merge_pages() {
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convert ${2}.jpg ${1}.jpg +append ${1}-${2}.jpg
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exiftool -overwrite_original -all= ${1}-${2}.jpg
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}
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# remove single pages
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mkdir single_pages
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for i in ???-???.jpg;do mv $(cut -d- -f1 <<< $i).jpg $(cut -d- -f2 <<< $i) single_pages;done
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## mpv
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### View thumbnails generated by [mpv-gallery-view](https://github.com/occivink/mpv-gallery-view)
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:::shell
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mpv --pause --demuxer=rawvideo --demuxer-rawvideo-mp-format=bgra --demuxer-rawvideo-w=288 --demuxer-rawvideo-h=162 FILE
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Convert to tiles
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:::shell
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ffmpeg -codec:v rawvideo -pixel_format bgra -video_size 288:162 -f image2 -pattern_type glob -i '*' -vf tile=layout=10x10 tile-%04d.png
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## Download
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### Bilibili live recording
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:::shell
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curl 'https://api.live.bilibili.com/xlive/web-room/v1/record/getLiveRecordUrl?rid=R1sx411c7Xn&platform=html5'|jq -r '.data.list | map(.url) | to_entries[] | .value + "\n out=" + (.key|tostring) + ".flv"' | aria2c --auto-file-renaming=false -x 16 -j 10 -i -
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mkvmerge '[' $(find . -name '*.flv'|sort -V) ']' -o merge.mkv
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## PDF
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### Downsample bitmap PDF
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Useful for sending large 300/600 dpi scans as e-mail. Change `pdfimage32` to
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`pdfimage8` for greyscale, `300` to the input DPI and `DownScaleFactor` to the
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desired downscaling. For some reason fails when setting compression to JPEG.
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:::shell
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gs -sDEVICE=pdfimage24 -r300 -dDownScaleFactor=2 -o downscaled.pdf document.pdf
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Imagemagick supports JPEG. Set your desired output density and JPEG quality.
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:::shell
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convert -density 300 -compress jpeg -quality 80 document.pdf downscaled.pdf
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## Screen sharing
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Since there is no good support for WebRTC screensharing with wayland, a virtual
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webcam device can be used.
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:::shell
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sudo modprobe v4l2loopback exclusive_caps=1 card_label=screensharing # only has to be done once
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wf-recorder --muxer=v4l2 --codec=rawvideo --file=/dev/video2 -x yuv420p # adjust /dev/video2 to the actual device
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To remove the virtual webcam device run `sudo modprobe -r v4l2loopback`
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