On 2021-02-26 22:53, Carl Zwanzig wrote:
On 2/26/2021 5:55 PM, Mark Filipak (ffmpeg) wrote:
The source video is a 5 second MKV clip from a commercial DVD.
Instead of using unknown data*, I suggest making your own test video so you're absolutely sure of
all the parameters. You could do this with the ffmpeg testsrc or with something like
Premier/FCP/etc. I'd also consider different containers.
Example-
ffmpeg -f lavfi -i testsrc=duration=10:size=1280x720:rate=30 testsrc.mpg
(that's _probably_ going to be correct; wouldn't hurt to check with an mpeg
analyzer)
Hi Carl. Thanks!
testsrc.mpg.cmd
ffmpeg -f lavfi -i testsrc=duration=5:size=1280x720:rate=30000/1001
testsrc.mpg
Above, I changed duration to '5' and rate to '30000/1001' in order to match
what I had already done.
I next checked showinfo:
testsrc.mpg.showinfo.cmd
ffmpeg -i testsrc.mpg -vf showinfo -f null - 2>testsrc.mpg.showinfo.txt
testsrc.mpg.showinfo.txt
[Parsed_showinfo_0 @ 000001d2e3ee22c0] n: 1 pts: 3003 pts_time:0.0333667
...
[Parsed_showinfo_0 @ 000001d2e3ee22c0] n: 2 pts: 6006 pts_time:0.0667333
...
[Parsed_showinfo_0 @ 000001d2e3ee22c0] n: 3 pts: 9009 pts_time:0.1001
...
etc.
As you see, the PTSs are correct, and times are correct with 100ns resolution.
Next, I want to remux testsrc.mpg to testsrc.mkv in order to duplicate a source with 1kHz timebase,
but I'll need your help because I don't know why the next script fails.
testsrc.mkv.cmd.
ffmpeg -i testsrc.mpg -codec copy testsrc.mkv
ffmpeg started on 2021-02-26 at 23:45:17
Report written to "ffmpeg-20210226-234517.log"
Log level: 32
ffmpeg version N-100851-g9f38fac053 Copyright (c) 2000-2021 the FFmpeg
developers
built with gcc 9.3-win32 (GCC) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config
--cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3
--disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2
--enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig
--enable-opencl --enable-libvmaf --enable-vulkan --enable-libvorbis --enable-amf --enable-libaom
--enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm
--enable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus
--enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband
--enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1
--enable-libtwolame --enable-libuavs3d --enable-libvidstab --enable-libx264 --enable-libx265
--enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC
--extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil 56. 64.100 / 56. 64.100
libavcodec 58.119.100 / 58.119.100
libavformat 58. 65.101 / 58. 65.101
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7.100.100 / 7.100.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Input #0, mpeg, from 'testsrc.mpg':
Duration: 00:00:04.97, start: 0.533367, bitrate: 715 kb/s
Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 104857 kb/s,
29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc
Output #0, matroska, to 'testsrc.mkv':
Metadata:
encoder : Lavf58.65.101
Stream #0:0: Video: mpeg1video (mpg1 / 0x3167706D), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9],
q=2-31, 104857 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 90k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[matroska @ 000001a98be3bac0] Timestamps are unset in a packet for stream 0. This is deprecated and
will stop working in the future. Fix your code to set the timestamps properly
[matroska @ 000001a98be3bac0] Can't write packet with unknown timestamp
av_interleaved_write_frame(): Invalid argument
frame= 29 fps=0.0 q=-1.0 Lsize= 135kB time=00:00:00.90
bitrate=1225.9kbits/s speed= 662x
video:135kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 0.003618%
Conversion failed!
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