[Feature Request] add lossless mode

[cdgriffith]

submitted by dbbs on discord

[MarcoRavich]

Would be useful, but wich (FFMPEG-supported) codec ?

Lossless: ffv1 – (FFmpeg Video Codec 1) flashsv – (Flash Screen Video 1) gif – (Graphics Interchange Format) png – (Portable Network Graphics) qtrle – (Apple Quicktime Animation (RLE)) zmbv – (Zip Motion Block / DosBox Capture Codec)

Lossless Intra Frames Only: bmp – (Bitmap Image) dpx – (Digital Picture Exchange) ffvhuff – (Huffyuv FFmpeg variant) huffyuv – (HuffYUV) ljpeg – (Lossless JPEG) pam – (Portable AnyMap / Netpbm) pbm – (Portable BitMap / Netpbm) pcx – (PC Paintbrush / Personal Computer Exchange Image) pgm – (Portable GrayMap / Netpbm) pgmyuv – (Portable GrayMap YUV / Netpbm) ppm – (Portable PixMap / Netpbm) r10k – (AJA Kona 10-bit RGB Codec) r210 – (Uncompressed RGB 10-bit) rawvideo – (Raw Video) sgi – (Silicon Graphics Image) sunrast – (Sun Raster Image) targa – (Truevision TGA Image) tiff – (Tagged Image File Format) utvideo – (Ut Video) v210 – (Uncompressed 4:2:2 10-bit) v410 – (Uncompressed 4:4:4 10-bit / SheerVideo?) xbm – (X BitMap) xwd – (X Window Dump) zlib – (Lossless Codec Library ZLIB)

Optionally Lossless: dirac / libschroedinger – (Dirac Compression Format) h264 / libx264 / libx264rgb – (H.264 / MPEG-4 AVC) snow – (Snow)

Optionally Lossless Intra Frames Only: jpeg2000 / libopenjpeg – (JPEG 2000) jpegls – (JPEG-LS / Lossless JPEG)

[cdgriffith]

For now planning to focus on the existing codes that support it, for example rigaya's hardware encoders have a --lossless option, as well as x265