Am So., 6. Sept. 2020 um 09:28 Uhr schrieb Mark Filipak <markfilipak.windows+ffm...@gmail.com>:
[...] > Soft telecined video is actually 23/1.001 frames per second of video > even though the metadata tells the decoder to produce 30/1.001 FPS. On the FFmpeg user mailing list, "decoder" and "metadata" have relatively strict meanings. Given these meanings, what you write is simply wrong. (Apart from the fact that telecined content does not necessarily have a framerate of 24000/1001, the whole point is that it can have any framerate, in the case of ntsc crts any framerate smaller than 30000/1001.) > Of course, the metadata is the key to how the stream 'teaches' the > decoder how to telecine. But since we don't want to telecine, this is irrelevant: We don't have access to an ntsc crt. If you decide to telecine, this cannot be done in the (FFmpeg) decoder, you need a (FFmpeg) video filter. > MPV is smart enough to recognize 23/1.001 FPS data and to ignore > the metadata and to play at 23/1.001 FPS. > Ffmpeg can do the same thing (and thereby eliminate the need to > transcode) Telecine and transcoding do not depend on each-other so this is highly misleading. > but the ffmpeg user has to tell ffmpeg to do it. No, in general, this is not true. (Command line and complete, uncut console output missing.) A few random remarks: You provided some definitions (actually claims) in your email without explaining in which domain you believe they are valid. They are not valid in the general case (and not valid in most domains). I believe you somewhere mention that you want to detect soft- telecined content. This is trivial and is not related to macroblocks. Your definition of our different interpretations of "interlaced" is completely backwards and wrong: A digital video stream can be encoded (!, not decoded as you imply) using encoding techniques meant for interlaced content. The decoder has to detect this and comply with it but this has no relevance for a user (it for many years was very important for FFmpeg developers). For display, it is very important to know if the actual content is interlaced or not. Most video players take the first information to decide but this is not valid in general (or, using your wording, "sloppy"). In both views, this is not necessarily related to macroblocks. Carl Eugen _______________________________________________ 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".
