[FFmpeg-user] Question about 2 pass encoding

[Syehoon Kim]

2024년 4월 8일 (월) 오전 10:38, Aditya Dandavate <adityadandavate04 at gmail.com>님이 작성:
>
> Even after waiting like 5 mins, I saw the same status as the output of the
> command, so what's the bug that is causing the first pass to not progress
> ahead ?
>
> On Sun, 7 Apr, 2024, 1:16 pm Aditya Dandavate, <adityadandavate04 at gmail.com>
> wrote:
>
> >
> > ffmpeg -i Map11.mp4 -c:v libvpx -quality good -cpu-used 2 -pass 1 -b:v 12000k -fps_mode cfr -pix_fmt yuv420p -f matroska NULL
> >
> > ffmpeg -i Map11.mp4 -c:v libvpx -quality good -cpu-used 2 -pass 2 -b:v 12000k -c:a copy -pix_fmt yuv420p pass1.mkv
> >
> > pause
> >
> >
> > Output:
> >
> >
> > F:\New folder\PrBoomX>ffmpeg -i Map11.mp4 -c:v libvpx -quality good -cpu-used 2 -pass 1 -b:v 12000k -fps_mode cfr -pix_fmt yuv420p -f matroska NULL
> >
> > ffmpeg version 7.0-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
> >
> >   built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
> >
> >   configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
> >
> >   libavutil      59.  8.100 / 59.  8.100
> >
> >   libavcodec     61.  3.100 / 61.  3.100
> >
> >   libavformat    61.  1.100 / 61.  1.100
> >
> >   libavdevice    61.  1.100 / 61.  1.100
> >
> >   libavfilter    10.  1.100 / 10.  1.100
> >
> >   libswscale      8.  1.100 /  8.  1.100
> >
> >   libswresample   5.  1.100 /  5.  1.100
> >
> >   libpostproc    58.  1.100 / 58.  1.100
> >
> > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Map11.mp4':
> >
> >   Metadata:
> >
> >     major_brand     : isom
> >
> >     minor_version   : 512
> >
> >     compatible_brands: isomiso2avc1mp41
> >
> >     encoder         : Lavf61.3.100
> >
> >   Duration: 00:13:24.65, start: 0.000000, bitrate: 12243 kb/s
> >
> >   Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080, 11999 kb/s, 60 fps, 60 tbr, 15360 tbn (default)
> >
> >       Metadata:
> >
> >         handler_name    : VideoHandler
> >
> >         vendor_id       : [0][0][0][0]
> >
> >         encoder         : Lavc61.5.101 libx264
> >
> >   Stream #0:1[0x2](und): Audio: mp3 (mp3float) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 233 kb/s (default)
> >
> >       Metadata:
> >
> >         handler_name    : SoundHandler
> >
> >         vendor_id       : [0][0][0][0]
> >
> > Stream mapping:
> >
> >   Stream #0:0 -> #0:0 (h264 (native) -> vp8 (libvpx))
> >
> >   Stream #0:1 -> #0:1 (mp3 (mp3float) -> vorbis (libvorbis))
> >
> > Press [q] to stop, [?] for help
> >
> > [libvpx @ 00000220b95c6c00] v1.14.0-226-g43d12d507
> >
> > Output #0, matroska, to 'NULL':
> >
> >   Metadata:
> >
> >     major_brand     : isom
> >
> >     minor_version   : 512
> >
> >     compatible_brands: isomiso2avc1mp41
> >
> >     encoder         : Lavf61.1.100
> >
> >   Stream #0:0(und): Video: vp8 (VP80 / 0x30385056), yuv420p(progressive), 1920x1080, q=2-31, 12000 kb/s, 60 fps, 1k tbn (default)
> >
> >       Metadata:
> >
> >         handler_name    : VideoHandler
> >
> >         vendor_id       : [0][0][0][0]
> >
> >         encoder         : Lavc61.3.100 libvpx
> >
> >       Side data:
> >
> >         cpb: bitrate max/min/avg: 0/0/12000000 buffer size: 0 vbv_delay: N/A
> >
> >   Stream #0:1(und): Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo, fltp (default)
> >
> >       Metadata:
> >
> >         handler_name    : SoundHandler
> >
> >         vendor_id       : [0][0][0][0]
> >
> >         encoder         : Lavc61.3.100 libvorbis
> >
> > frame=    0 fps=0.0 q=0.0 size=       5KiB time=N/A bitrate=N/A speed=N/A
> >
> >
> > So, as you can see, that no progress is seen when encoding with 2 pass with VP8.
> >
> >
> > Same is the case for libvpx-vp9 as well.
> >
> >
> > Are there some faults in my command so the progress is stopped or is there a bug in vpx ?
> >
> >
> > Please help me!
> >
> > Also, congrats for the new release. 🙏💯
> >
> >
I tried with a video which duration is 36 seconds. FFmpeg seemed to be
stopped, but after about 36 seconds, output file was created
correctly.
I think for pass 1, there is no video frame, and that's why FFmpeg
doesn't show progress. No frame, so frame =0, fps=0.
I guess you should wait about the duration, in this case 13 minutes,
since FFmpeg processes it about 1x.
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