Anatol <anatol2002 <at> gmail.com> writes: > Following are idet results of my file:
Which file? The input or output file? Of which operation? Sorry if my question was unlear. > [Parsed_idet_0] Repeated Fields: Neither: 903 Top: 0 > Bottom: 1 > [Parsed_idet_0] Single frame detection: TFF: 0 BFF: 0 > Progressive: 220 Undetermined: 684 > [Parsed_idet_0] Multi frame detection: TFF: 0 BFF: 0 > Progressive: 902 Undetermined: 2 > > While those are idet of a sample file that was generated from > the same source and with similar encoding params (more or less), > but with PAFF/TFF: Which FFmpeg command created the file that idet detects as TFF? Please understand that there are two *completely* unrelated definitions related to your question: I consider a file "interlaced" if horizontal motion, if checked visually, leads to ugly combing effects. Mediainfo cannot detect if a file is "interlaced" (according to my above definition) because you have to inspect the frames, usually visually but idet can do this for you. Another definition of "interlaced" is the used encoding type: Either the whole frame was encoded "progressively" or every frame was encoded as two fields (interlaced, PAFF) or (the following is said to produce better compression) a more sophisticated method that also leads to "interlaced" encoding as detected by Mediainfo is used. This second definition of "interlaced" applies to all SD DVB streams I know, no matter if they contain live (really interlaced) content or 24/25fps movie or TV content that has no combing artefacts, no matter how interlaced it is supposed to be. Or to say it differently: You can use interlaced encoding for progressive input material (as you did in your example) but the output will still be progressive although Mediainfo will claim it is interlaced. If you used PAFF, the encoding efficiency is expected to be (slightly) worse than if you had used progressive encoding. For MBAFF, this disadvantage may not exist but the "interlaced" output would still be progressive because the input was progressive. If you use progressive encoding for interlaced input you need a (very) much higher bitrate to get acceptable quality. You may want to look at the interlace filter but if your input is <50fps, you won't be happy with the output. If you absolutely (really) want to get a few ugly arefacts in your input stream to make somebody happy, try the phase filter;-) Carl Eugen _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
