Am Mo., 16. Dez. 2019 um 09:03 Uhr schrieb Mark Filipak <[email protected]>: > > On 12/15/2019 06:58 PM, Carl Eugen Hoyos wrote: > > Am So., 15. Dez. 2019 um 22:20 Uhr schrieb Mark Filipak > > <[email protected]>: > >> > >> On 12/15/2019 02:38 PM, Carl Eugen Hoyos wrote: > >>> Am So., 15. Dez. 2019 um 16:50 Uhr schrieb Mark Filipak > > > >>> FFmpeg (and digital transcoders in general) doesn't know about fields, > >>> it can only work with frames. (This is also related to the specifications > >>> of sane video codecs.) > >> > >> If ffmpeg doesn't know about fields, how can it decode interlaced content? > > > > The mentioned specifications require that conforming decoders output > > frames... > > Carl, that's the most important information I've received to date. It > changes most of all my research -- mostly, it simplifies things. Thank > you very, very much.
> I knew that ffmpeg encoders output solely frames, but I assumed that, I may misunderstand but this is at least misleading, could be considered wrong. > when an interlaced container was encountered, ffmpeg decoders (hence > HandBrake) worked with fields. The FFmpeg infrastructure cannot work with fields which is the reason that interlaced encodings of hevc and jpeg2000 are not supported correctly. > Due to the German in your messages, I assume you're in Europe. My > research needs some PAL VOB samples of the following: > - Vintage "PAL" Cinematic Source -- Purely 24 FPS content (no VBR) in an > 25 FPS container (that plays at 25 Hz with 4% speedup). Just search for a a pal vob file of a movie. > - "PAL" Cinematic Source -- 25 FPS source (25th frame repeat) in a 25 > FPS container (I currently have only 1 modern "PAL" movie sample). I consider this broken, FFmpeg can (at least theoretically) fix such streams. > - PAL TV Source -- 25 FPS sequential fields (from PAL TV). Any pal transport stream, they of course exist both with interlaced and progressive content, always interlaced encoding. > - Mixed PAL Source -- PAL TV show with embedded movie clips (e.g., some > "Making of" documentaries). > - Vintage Mixed PAL Source -- Vintage PAL TV show (4% speedup) with > embedded movie clips (e.g., some "Making of" documentaries). Not sure about these, but they were mentioned here before. I wonder in which category true vfr movies like the Titanic intro fall... Generally, I don't think it is correct to argue that increasing frame rate helps encoding, it depends on the specific input. Carl Eugen _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
