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,
when an interlaced container was encountered, ffmpeg decoders (hence
HandBrake) worked with fields.
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).
- "PAL" Cinematic Source -- 25 FPS source (25th frame repeat) in a 25
FPS container (I currently have only 1 modern "PAL" movie sample).
- PAL TV Source -- 25 FPS sequential fields (from PAL TV).
- 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).
Do you know how/where I can obtain samples of the 5 source videos above?
=== Details ===
I've found, when VBR sources contain mixed sequential/progressive
content (example: Mixed NTSC TV with embedded 24 FPS clips), that line
doubling at 60 FPS (instead of decombing) produces a better transcode. I
assume that the same would be true for PAL at 50 FPS, but I don't have
any samples to confirm it.
Currently, getting the best HandBrake transcode is a matter of
trial-&-error. I'm trying to use the reports returned by
ffmpeg -ss 30.0 -i %1 -filter:v idet -frames:v 900 -an -f rawvideo -y NUL
to change that.
As I wrote in my initial post, so far I've been wildly successful. My
approach may be unique. It could revolutionize HandBrake -- it could
turn HandBrake into a truly 'one-click' transcoder. But I need some
sample PAL VOBs to proceed.
Best Regards, and Thanks Again! Happy Holidays!
Mark.
_______________________________________________
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".
