#5037: WEBM VP8 & VP9 - 2-pass encoding does not work
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Reporter: solidghost | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: unspecified | undetermined
Keywords: libvpx | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by cehoyos):
I tested the following command lines and the bitrates in the output files
are very close to what I requested for vp8:
{{{
$ ffmpeg -f lavfi -i testsrc2 -vcodec vp8 -pass 1 -t 120 -vb 500k
out1.webm
$ ffmpeg -f lavfi -i testsrc2 -vcodec vp8 -pass 2 -t 120 -vb 500k -y
out1.webm
}}}
{{{
$ ffmpeg -f lavfi -i testsrc2 -vcodec vp8 -pass 1 -t 120 -vb 200k
out2.webm
$ ffmpeg -f lavfi -i testsrc2 -vcodec vp8 -pass 2 -t 120 -vb 200k -y
out2.webm
}}}
vp9 does not produce an output file of the requested size with my old
version of libvpx (1.3) but I get different output file sizes for
different requested bitrates.
{{{
$ ffmpeg -f lavfi -i testsrc2 -vcodec vp9 -pass 1 -t 120 -vb 200k
out3.webm
$ ffmpeg -f lavfi -i testsrc2 -vcodec vp9 -pass 2 -t 120 -vb 200k -y
out3.webm
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5037#comment:6>
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