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July 2020

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#7272(undetermined:new): encoding with hevc_amf results in video where forwarting is a mess
by FFmpeg 02 Jul '20

02 Jul '20

#7272: encoding with hevc_amf results in video where forwarting is a mess -------------------------------------+------------------------------------- Reporter: sheepchen | Type: defect Status: new | Priority: important Component: | Version: undetermined | unspecified Keywords: hevc_amf | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Hi, I recode videos on nvidia and AMD cards in x265. The nvidia output is nice and ok (in example for ref). The AMD output looks OK. But you can not fast forward in it. It uses 100% CPU and needs minutes. The funny thing is that for the nvidia compile I used an old version of ffmpeg and for the amd I used the newest version. Are there missing parameters by the AMD ffmpeg command or is it a bug with compiling with hevc_amf? EXAMPLETIME ----------- For example I have cut a 3 minute video and compiled it both ways. Original clip: https://sheepchen.net/nextcloud/index.php/s/Nku5EUrTZ37BzAo ENC NVIDIA (good): https://sheepchen.net/nextcloud/index.php/s/RJCXZzsIJBOWVK7 ENC AMD (bad): https://sheepchen.net/nextcloud/index.php/s/e61XOfrHxpghwwf EXAMPLE NVIDIA: >>\ffmpeg_20170827\bin\ffmpeg.exe -hwaccel cuvid -i "s:\temp\in_orig.mkv" -c:v hevc_nvenc -profile:v main -rc vbr_hq -qmin 18 -qmax 24 -b:v 1000k -maxrate 3000k -preset slow -rc-lookahead 32 -g 250 -c:a copy -c:s copy -map 0 "s:\temp\out_nvidia.mkv" ffmpeg version N-87095-gef0c6d9 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.1.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-cuda --enable- cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable- libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable- libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib libavutil 55. 74.100 / 55. 74.100 libavcodec 57.103.101 / 57.103.101 libavformat 57. 78.100 / 57. 78.100 libavdevice 57. 8.100 / 57. 8.100 libavfilter 6.100.100 / 6.100.100 libswscale 4. 7.103 / 4. 7.103 libswresample 2. 8.100 / 2. 8.100 libpostproc 54. 6.100 / 54. 6.100 Input #0, matroska,webm, from 's:\temp\in_orig.mkv': Metadata: ENCODER : Lavf57.71.100 Duration: 00:01:00.00, start: 0.080000, bitrate: 12347 kb/s Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default) Metadata: DURATION : 00:01:00.000000000 Stream #0:1(ger): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default) Metadata: DURATION : 00:00:59.952000000 Stream #0:2: Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s (default) Metadata: DURATION : 00:00:59.952000000 Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_nvenc)) Stream #0:1 -> #0:1 (copy) Stream #0:2 -> #0:2 (copy) Press [q] to stop, [?] for help Output #0, matroska, to 's:\temp\out_nvidia.mkv': Metadata: encoder : Lavf57.78.100 Stream #0:0: Video: hevc (hevc_nvenc) (Main), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=18-24, 1000 kb/s, 25 fps, 1k tbn, 25 tbc (default) Metadata: DURATION : 00:01:00.000000000 encoder : Lavc57.103.101 hevc_nvenc Side data: cpb: bitrate max/min/avg: 3000000/0/1000000 buffer size: 2000000 vbv_delay: -1 Stream #0:1(ger): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 192 kb/s (default) Metadata: DURATION : 00:00:59.952000000 Stream #0:2: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 448 kb/s (default) Metadata: DURATION : 00:00:59.952000000 % EXAMPLE AMD: >>\ffmpeg-20180619\bin\ffmpeg.exe -hwaccel dxva2 -i "s:\temp\in_orig.mkv" -c:v hevc_amf -profile:v main -qmin 18 -qmax 24 -b:v 1000k -maxrate 3000k -rc-lookahead 32 -g 250 -c:a copy -c:s copy -map 0 "s:\temp\out_amd.mkv" ffmpeg version N-91330-ga990184007 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 7.3.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable- bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable- libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable- libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable- nvenc --enable-nvdec --enable-dxva2 --enable-avisynth libavutil 56. 18.102 / 56. 18.102 libavcodec 58. 20.103 / 58. 20.103 libavformat 58. 17.100 / 58. 17.100 libavdevice 58. 4.101 / 58. 4.101 libavfilter 7. 25.100 / 7. 25.100 libswscale 5. 2.100 / 5. 2.100 libswresample 3. 2.100 / 3. 2.100 libpostproc 55. 2.100 / 55. 2.100 Input #0, matroska,webm, from 's:\temp\in_orig.mkv': Metadata: ENCODER : Lavf57.71.100 Duration: 00:01:00.00, start: 0.080000, bitrate: 12347 kb/s Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default) Metadata: DURATION : 00:01:00.000000000 Stream #0:1(ger): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default) Metadata: DURATION : 00:00:59.952000000 Stream #0:2: Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s (default) Metadata: DURATION : 00:00:59.952000000 Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_amf)) Stream #0:1 -> #0:1 (copy) Stream #0:2 -> #0:2 (copy) Press [q] to stop, [?] for help Output #0, matroska, to 's:\temp\out_amd.mkv': Metadata: encoder : Lavf58.17.100 Stream #0:0: Video: hevc (hevc_amf), nv12, 1920x1080 [SAR 1:1 DAR 16:9], q=18-24, 1000 kb/s, 25 fps, 1k tbn, 25 tbc (default) Metadata: DURATION : 00:01:00.000000000 encoder : Lavc58.20.103 hevc_amf Stream #0:1(ger): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 192 kb/s (default) Metadata: DURATION : 00:00:59.952000000 Stream #0:2: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 448 kb/s (default) Metadata: DURATION : 00:00:59.952000000 % -- Ticket URL: <https://trac.ffmpeg.org/ticket/7272> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#8768(ffmpeg:new): libx265 passlog/mbtree file reuse for lower resolutions 2-pass encoding. $350 USD bounty.
by FFmpeg 01 Jul '20

01 Jul '20

#8768: libx265 passlog/mbtree file reuse for lower resolutions 2-pass encoding. $350 USD bounty. ---------------------------------+--------------------------------------- Reporter: Mista_D | Type: enhancement Status: new | Priority: normal Component: ffmpeg | Version: unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------+--------------------------------------- Looking for a method to run HEVC pass1 once at 4K resolution. And then re- use same one passlog file to encode ABR set - 4K, 1080p, 720p, 480p and 360p files all at various bitrates please. This has been done before in June 2012 by "the one and only" Dark Shikari, his patch is attached for reference. expected behaviour: ffmpeg -y -i 4k_foo.mp4 \ -x265-params pass=1:stats=bar -c:v libx265 -f mp4 /dev/null ffmpeg -y -i 4k_foo.mp4 \ -x265-params pass=2:stats=bar -c:v libx265 4k.mp4 \ -x265-params pass=2:stats=bar -c:v libx265 -s 1280x720 720p.mp4 -- Ticket URL: <https://trac.ffmpeg.org/ticket/8768> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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