Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
2018-12-08 11:46 GMT+01:00, Kieran O Leary : > When re-wrapping DPX or TIFF images to Matroska, it appears that > FFmpeg uses the V_QUICKTIME codec ID. Where can I find the specification for tiff in matroska and dpx in matroska? > Why is this used? > Would something like V_UNCOMPRESSED (for raw TIFF anyhow) > be more appropriate/ If you use -vcodec rawvideo instead of tiff or dpx (which are not rawvideo) you get V_UNCOMPRESSED but note that matroska is not a useful container for rawvideo because it is not well defined, use nut instead. Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
On Sat, Dec 8, 2018 at 10:46 AM Kieran O Leary wrote: > Hi, > > When re-wrapping DPX or TIFF images to Matroska, it appears that FFmpeg > uses the V_QUICKTIME codec ID. Why is this used? Would something like > V_UNCOMPRESSED (for raw TIFF anyhow) b more appropriate/ > Ugh, This only happens with tiff - my command line was wrong for the DPX mediainfo check :( ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
2018-12-08 11:46 GMT+01:00, Kieran O Leary : > When re-wrapping DPX or TIFF images to Matroska, it appears that > FFmpeg uses the V_QUICKTIME codec ID. Where can I find the specification for tiff in matroska and dpx in matroska? > Why is this used? The answer depends on above... Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
Hi Carl, On Sat, Dec 8, 2018 at 11:00 AM Carl Eugen Hoyos wrote: > 2018-12-08 11:46 GMT+01:00, Kieran O Leary : > > > When re-wrapping DPX or TIFF images to Matroska, it appears that > > FFmpeg uses the V_QUICKTIME codec ID. > > Where can I find the specification for tiff in matroska and dpx in > matroska? > I don't think they exist - this remuxing is most likely not common/never used. I'll get in touch with the CELLAR/IETF list and see if anyone has any ideas. Also, as per my last email, DPX is fine - V_MS/VFW/FOURCC / dpx . I just had a crappy command line :( > > > Why is this used? > > > Would something like V_UNCOMPRESSED (for raw TIFF anyhow) > > be more appropriate/ > > If you use -vcodec rawvideo instead of tiff or dpx (which are not > rawvideo) you get V_UNCOMPRESSED but note that matroska > is not a useful container for rawvideo because it is not well > defined, use nut instead. > Cool, but why is a QuickTime ID used ? Is this some sort of generic fallback that ffmpeg uses? Best, Kieran. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
On Sat, Dec 8, 2018 at 12:10 PM Kieran O Leary wrote: > Hi Carl, > > > On Sat, Dec 8, 2018 at 11:00 AM Carl Eugen Hoyos > wrote: > >> 2018-12-08 11:46 GMT+01:00, Kieran O Leary : >> >> > When re-wrapping DPX or TIFF images to Matroska, it appears that >> > FFmpeg uses the V_QUICKTIME codec ID. >> >> Where can I find the specification for tiff in matroska and dpx in >> matroska? >> > > I don't think they exist - this remuxing is most likely not common/never > used. I'll get in touch with the CELLAR/IETF list and see if anyone has any > ideas. > P.S - Carl - not sure if you're on CELLAR, but here's a link to the thread I started - https://mailarchive.ietf.org/arch/browse/cellar/ ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
2018-12-08 13:10 GMT+01:00, Kieran O Leary : > Hi Carl, > > > On Sat, Dec 8, 2018 at 11:00 AM Carl Eugen Hoyos wrote: > >> 2018-12-08 11:46 GMT+01:00, Kieran O Leary : >> >> > When re-wrapping DPX or TIFF images to Matroska, it appears that >> > FFmpeg uses the V_QUICKTIME codec ID. >> >> Where can I find the specification for tiff in matroska and dpx in >> matroska? >> > > I don't think they exist - this remuxing is most likely not common/never > used. I'll get in touch with the CELLAR/IETF list and see if anyone has any > ideas. > Also, as per my last email, DPX is fine - V_MS/VFW/FOURCC / dpx . I > just had a crappy command line :( I don't think it's fine: You are using a very unusual fourcc to put something in matroska that is not meant to be there, expect massive compatibility issues. >> > Why is this used? >> >> > Would something like V_UNCOMPRESSED (for raw TIFF anyhow) >> > be more appropriate/ >> >> If you use -vcodec rawvideo instead of tiff or dpx (which are not >> rawvideo) you get V_UNCOMPRESSED but note that matroska >> is not a useful container for rawvideo because it is not well >> defined, use nut instead. > > Cool, but why is a QuickTime ID used ? Is this some sort of generic > fallback that ffmpeg uses? Just like the V_MS/VFW/FOURCC codec id above for avi, there is also a QuickTime fallback defined for Matroska (not by FFmpeg), tiff happens to be defined for QuickTime but not in avi, therefore the QuickTime code point is used for Matroska. Contrary to dpx above, this can at least be argued to be following some standard. Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
On Sat, Dec 8, 2018 at 12:38 PM Carl Eugen Hoyos wrote: > 2018-12-08 13:10 GMT+01:00, Kieran O Leary : > > Hi Carl, > > > > > > On Sat, Dec 8, 2018 at 11:00 AM Carl Eugen Hoyos > wrote: > > > >> 2018-12-08 11:46 GMT+01:00, Kieran O Leary : > >> > >> > When re-wrapping DPX or TIFF images to Matroska, it appears that > >> > FFmpeg uses the V_QUICKTIME codec ID. > >> > >> Where can I find the specification for tiff in matroska and dpx in > >> matroska? > >> > > > > I don't think they exist - this remuxing is most likely not common/never > > used. I'll get in touch with the CELLAR/IETF list and see if anyone has > any > > ideas. > > > Also, as per my last email, DPX is fine - V_MS/VFW/FOURCC / dpx . I > > just had a crappy command line :( > > I don't think it's fine: You are using a very unusual fourcc to put > something > in matroska that is not meant to be there, expect massive compatibility > issues. > Good point. > > >> > Why is this used? > >> > >> > Would something like V_UNCOMPRESSED (for raw TIFF anyhow) > >> > be more appropriate/ > >> > >> If you use -vcodec rawvideo instead of tiff or dpx (which are not > >> rawvideo) you get V_UNCOMPRESSED but note that matroska > >> is not a useful container for rawvideo because it is not well > >> defined, use nut instead. > > > > Cool, but why is a QuickTime ID used ? Is this some sort of generic > > fallback that ffmpeg uses? > > Just like the V_MS/VFW/FOURCC codec id above for avi, there is > also a QuickTime fallback defined for Matroska (not by FFmpeg), > tiff happens to be defined for QuickTime but not in avi, therefore > the QuickTime code point is used for Matroska. > Contrary to dpx above, this can at least be argued to be following > some standard. > This all makes sense to me and it's incredibly helpful. I see the TIFF mapping in the QuickTime spec now. So I guess that TIFF, and DPX need to be mapped in the Matroska specification? Best, Kieran. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
2018-12-08 13:45 GMT+01:00, Kieran O Leary : > So I guess that TIFF, and DPX need to be mapped in the Matroska > specification? Not sure if I am the right person to answer but why would you want to put images into another container? Shouldn't you keep the original image files and use ffmpeg to produce a view copy in the requested quality? Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
On Sat, 8 Dec 2018, 12:48 Carl Eugen Hoyos 2018-12-08 13:45 GMT+01:00, Kieran O Leary : > > > So I guess that TIFF, and DPX need to be mapped in the Matroska > > specification? > > Not sure if I am the right person to answer but why would you want to > put images into another container? > > Shouldn't you keep the original image files and use ffmpeg to produce > a view copy in the requested quality? > Image sequences are difficult to deal with,especially with LTO tape libraries. Archives commonly use zip in either a compressed or uncompressed form to alleviate this issue. It's preferable to have an uncompressed or lossless single file for ease of use, compatibility with tape libraries and digital asset management systems. I would prefer to retain the original image sequence but it is not common practise I'm archives from what I understand,for the reasons outlined above. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska
2018-12-08 14:05 GMT+01:00, Kieran O Leary : > On Sat, 8 Dec 2018, 12:48 Carl Eugen Hoyos >> 2018-12-08 13:45 GMT+01:00, Kieran O Leary : >> >> > So I guess that TIFF, and DPX need to be mapped in the Matroska >> > specification? >> >> Not sure if I am the right person to answer but why would you want to >> put images into another container? >> >> Shouldn't you keep the original image files and use ffmpeg to produce >> a view copy in the requested quality? > > Image sequences are difficult to deal with,especially with LTO tape > libraries. Archives commonly use zip in either a compressed or > uncompressed form to alleviate this issue. How does this contradict what I write above? Assuming a current high-quality, widely adopted video codec for the view copy would be obsolete after a decade (that's too soon, no?), that would mean one necessary access to the file system every ten years: Is that too difficult to deal with? > It's preferable to have an uncompressed or lossless single > file for ease of use I don't think so... (But fortunately, it is your decision!) Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
