Open srfoster opened 5 years ago
On #master
, I get slightly different results -- but it still doesn't feel quite right.
#lang racket
(require video/base video/player video/render)
(define m (clip "original.mp4"
#:start 10
#:length 1))
(render m "out.mp4" #:width 640 #:height 480)
This gives me an output file that begins with the 1-second bit that I wanted, but it appears to be padded with a bunch of blackness at the end. The file is about 30-minutes long -- the same length as my original.mp4
.
>ffmpeg -i out.mp4 2>&1 | grep "Duration"
Duration: 00:29:21.34, start: 0.000000, bitrate: 0 kb/s
As for the previewer, it seems to have the same bug as on #stable
: it just shows me a 1-second clip starting at the very beginning of my original.mp4
rather than the 10-second mark.
Just installed video-testing
with Racket 7.8 CS under macOS 10.14, and having similar issues.
The preview always starts at 0, no matter what I give for #:start
.
What the previewer player shows as the current position oscillates rapidly between a credible value and something that looks random.
Trying to preview a playlist consisting of a few clip
producers (which all work individually) runs out of memory inside DrRacket. From a plain Racket REPL,
(require video/player)
(preview vid)
opens a player with a black image area and then crashes:
; in-vertices: vertex #f not in graph #<weighted-graph>
; Context:
; .../graph/graph-weighted.rkt:191:0 in-weighted-graph-neighbors
; .../graph/graph-fns-basic.rkt:57:4 for-loop
; .../graph/graph-fns-basic.rkt:46:0 bfs/generalized
; .../private/ffmpeg-pipeline.rkt:1650:0 get-seek-point
; .../private/ffmpeg-pipeline.rkt:1291:0 init-filter-graph
; .../video/render.rkt:515:7
; .../video/player.rkt:103:4 !play method in video-player-server%
; .../video/player.rkt:458:0 preview
; .../private/arrow-val-first.rkt:555:3
I'm getting some confusing behavior with
(clip ...)
-- both when I(preview ...)
and when I(render ...)
.Here, I expected the previewer to show me a 1-second clip that starts at the 10-second mark of my original clip and ends at the 11-second mark of the original.
Instead, it shows me a 1-second clip starting at the 0-second mark of my original.
The behavior with
(render ...)
is different, but also unexpected. Again, I expected the previewer to show me a 1-second clip that starts at the 10-second mark of my original clip and ends at the 11-second mark of the original.Instead, I get a 10 second clip that actually does start at the right spot (the 10-second mark), and it has the 1-second of footage. But it seems to be padded at the end, making the clip 10-seconds long.
I should mention that I'm on the
#stable
branch. I'm about to retry with the most recent version.