On 2018-01-07 11:01, Moritz Barsnick wrote:
On Sat, Jan 06, 2018 at 23:08:32 -0800, Jim DeLaHunt wrote:
ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv
ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv
Those examples lack a `-f image2` option. I would expect that option to
be there; after all, isn't the image2 format exactly what this section
is trying to explain?
Do the examples work for you or do they not?
I hadn't tried when I asked my question. I used a couple of PNG still
frames with one of the examples, and sure enough, it works without error
[2].
I *believe* the detail that is missed in the documentation is that the
use of a pattern "implies" the image2 demuxer (or muxer, if used as
output). Apparently with such a high priority that I can't even open a
single image named "%03d.jpg" without the image2 demuxer jumping in and
trying to resolve that pattern. ;-)
In other words: For those three examples, "-f image2" just isn't
required. It's optional, but pointing that out *might* be nice.
Oh, wow. I think that is significant information, and it should be
included in the documentation.
On 2018-01-07 11:05, Moritz Barsnick wrote:
Honestly, when debugging stuff and in doubt, just try it first.
Harrumph. "Just try it first" is practical advice for this project, it
seems. But I am still unsatisfied with the documentation. My philosophy
of documentation is that it should be an explanation and a help, not a
riddle.
I've filed a ticket noting some deficiencies in the documentation,
including that there's no mention that use of a pattern in an input file
name implies `-f image2`, and that the examples which lack `-f image2`
do not point out that this is correct and why it works, and that there
are no examples which include `-f image2`. See [1].
Thank you for the clarification, Moritz!
—Jim DeLaHunt, Vancouver, Canada
[1] <https://trac.ffmpeg.org/ticket/6950#ticket>
[2]
% ffmpeg -framerate 10 -i 'blue_%d.png' out.mkv
ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
--enable-avresample --enable-libmp3lame --enable-libvorbis
--enable-libopus --enable-librsvg --enable-libtheora
--enable-libopenjpeg --enable-libmodplug --enable-libvpx
--enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray
--enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype
--enable-libfribidi --disable-indev=jack --enable-opencl
--disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox
--enable-sdl2 --mandir=/opt/local/share/man --enable-shared
--enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-x86asm
--enable-libx265 --enable-gpl --enable-postproc --enable-libx264
--enable-libxvid
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, image2, from 'blue_%d.png':
Duration: 00:00:00.20, start: 0.000000, bitrate: N/A
Stream #0:0: Video: png, pal8(pc), 212x318, 10 tbr, 10 tbn, 10 tbc
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x7fe883013c00] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x7fe883013c00] profile High 4:4:4 Predictive, level 1.2,
4:4:4 8-bit
[libx264 @ 0x7fe883013c00] 264 - core 148 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2017 - http://www.videolan.org/x264.html - options:
cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1
cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=10
lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0
bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
aq=1:1.00
Output #0, matroska, to 'out.mkv':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p,
212x318, q=-1--1, 10 fps, 1k tbn, 10 tbc
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 2 fps=0.0 q=-1.0 Lsize= 2kB time=00:00:00.10 bitrate=
143.7kbits/s speed=3.06x
video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 78.543304%
[libx264 @ 0x7fe883013c00] frame I:1 Avg QP:11.06 size: 148
[libx264 @ 0x7fe883013c00] frame P:1 Avg QP:20.45 size: 193
[libx264 @ 0x7fe883013c00] mb I I16..4: 0.7% 98.2% 1.1%
[libx264 @ 0x7fe883013c00] mb P I16..4: 0.0% 0.0% 0.7% P16..4:
0.7% 0.0% 0.0% 0.0% 0.0% skip:98.6%
[libx264 @ 0x7fe883013c00] 8x8 transform intra:97.5% inter:0.0%
[libx264 @ 0x7fe883013c00] coded y,u,v intra: 0.7% 0.7% 0.4% inter: 0.3%
0.3% 0.2%
[libx264 @ 0x7fe883013c00] i16 v,h,dc,p: 0% 50% 50% 0%
[libx264 @ 0x7fe883013c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 46% 0% 54%
0% 0% 0% 0% 0% 0%
[libx264 @ 0x7fe883013c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 9% 46%
4% 0% 1% 1% 1% 0%
[libx264 @ 0x7fe883013c00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fe883013c00] kb/s:13.64
% ls -l out.mkv
-rw-r--r-- 1 myuser staff 1814 7 Jan 11:41 out.mkv
--
--Jim DeLaHunt, j...@jdlh.com http://blog.jdlh.com/
(http://jdlh.com/)
multilingual websites consultant
355-1027 Davie St, Vancouver BC V6E 4L2, Canada
Canada mobile +1-604-376-8953
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