Am So., 20. Sept. 2020 um 06:59 Uhr schrieb Mark Filipak (ffmpeg) <markfili...@bog.us>: > > On 09/18/2020 03:01 PM, Carl Eugen Hoyos wrote: > >> Am 16.09.2020 um 15:58 schrieb Mark Himsley <mark.hims...@gmail.com>: > >>> On Mon, 14 Sep 2020 at 15:42, Mark Filipak (ffmpeg) <markfili...@bog.us> > >>> wrote: > >>> Is the input to the bwdif filter fields or frames? > >> The input to every filter in a filter chain is a raster of pixels. > >> That raster may contain one frame or two fields. > > > > That may not be wrong (apart from Paul’s comment) but I wonder how useful > > it is: > > No matter if the raster contains one field, two interlaced fields or a > > progressive > > frame, the filter will always see an input frame. > > "...if the raster contains *one field*...the filter will always see an input > *frame*." > How is that possible? How can a frame contain just one field?
The following makes little sense, it is just meant as an example: $ ffmpeg -f lavfi -i testsrc2,field -vf bwdif -f null - Here, the input to the bwdif consists of frames that contain one field (of the original input). > > The fact that there is metadata that may signal the content is also not > > necessarily > > helpful as this metadata is typically wrong (often signalling fields when a > > frame is provided). > > Can you provide an example (or a link to an example)? I've examined a > great number of DSM mpeg presentation streams ('VOB's & 'm2ts's) and > I've not seen a single case. What metadata are you looking at? > sequence_extension: 'progressive_sequence'? > picture_coding_extension: 'picture_structure'? > picture_coding_extension: 'top_field_first'? > picture_coding_extension: 'repeat_first_field'? I would expect that most commercial encodings you have uses one of the above, independently of the content... > picture_coding_extension: 'progressive_frame'? ... while this is unusual, even for movies in PAL streams. Otoh, I typically saw pal dvb streams, maybe my claim is only true for them. 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".