[FFmpeg-trac] #7302(undetermined:new): h264_nvenc / b_ref_mode middle with refs parameter is not working
FFmpeg
trac at avcodec.org
Tue Sep 4 10:24:54 EEST 2018
#7302: h264_nvenc / b_ref_mode middle with refs parameter is not working
-------------------------------------+-------------------------------------
Reporter: | Owner:
smallishzulu | Status: new
Type: defect | Component:
Priority: normal | undetermined
Version: unspecified | Resolution:
Keywords: nvenc | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by smallishzulu):
Official NVIDIA reply to this ticket over their ticket system:
The combination of options "-bf 4 -refs 2 -b_ref_mode middle" is invalid.
The -refs option is a generic ffmpeg option for controlling the maximum
DPB size; it does not specify the index of the B-frame that should be used
as reference. The B-frame to be used as a reference frame is selected by
the driver (for the "middle" mode, it will be number_of_b_frames / 2).
Further, using B-frames as reference requires a DPB size of at least 3 (2
slots for the reference frames on which the B-frame would depend and one
slot for the B-frame itself), so in this specific case (-refs 2), the DPB
is not large enough for use with the B-frames as reference feature.
However if I set -refs 3, than FFmpeg give out Invalid DTS errors:
/opt/ffmpeg/bin/ffmpeg -loglevel verbose -re -i /home/admintv/big-buck-
bunny_294_1280x720.mp4 -aspect 16:9 -s 720x576 -map 0:0 -c:v:0
h264_nvenc -temporal-aq 1 -spatial-aq 1 -aq-strength 15 -2pass 1 -preset
slow -cbr 1 -rc cbr -profile:v main -vb 1550k -minrate 1550k -maxrate
1550k -bufsize 1550k -muxrate 1790k -flags +ilme+ildct -top 1 -r 25
-pix_fmt yuv420p -map 0:1 -c:a:0 aac -b:a:0 128k -g 50 -f mpegts -bf 4
-refs 3 -b_ref_mode middle 'udp://192.168.2.100:5000?pkt_size=188'
ffmpeg version N-91062-gf995aa8 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --prefix=/opt/ffmpeg --enable-nonfree --enable-gpl
--extra-cflags='-I/opt/ffmpeg/include -I/usr/local/include
-I/usr/local/cuda/include -I/opt/ndi/sdk/include' --extra-
ldflags='-L/opt/ffmpeg/lib -L/usr/local/cuda/lib64 -L/opt/ndi/sdk/lib'
--bindir=/opt/ffmpeg/bin --extra-libs=-ldl --enable-libx264 --enable-
libx265 --enable-nonfree --enable-gpl --enable-nvenc --enable-libzvbi
--enable-libfdk-aac --enable-libzimg --enable-libzmq --enable-libfreetype
--enable-static --enable-shared --enable-hardcoded-tables --enable-vdpau
--enable-cuda --enable-cuvid --enable-libvpx --enable-libmp3lame --enable-
libndi_newtek --enable-openssl --enable-ffnvcodec --enable-libfontconfig
--enable-libfribidi --enable-cuda-sdk --enable-libnpp
libavutil 56. 18.102 / 56. 18.102
libavcodec 58. 19.101 / 58. 19.101
libavformat 58. 13.102 / 58. 13.102
libavdevice 58. 4.100 / 58. 4.100
libavfilter 7. 22.100 / 7. 22.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
[h264 @ 0x920640] Reinit context to 1280x720, pix_fmt: yuv420p
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/admintv/big-buck-
bunny_294_1280x720.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: mp41
creation_time : 1970-01-01T00:00:00.000000Z
title : Big Buck Bunny
encoder : Lavf52.13.0
Duration: 00:09:56.46, start: 0.000000, bitrate: 2353 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline), 1 reference
frame (avc1 / 0x31637661), yuv420p(left), 1280x720 [SAR 1:1 DAR 16:9],
2220 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 127 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_nvenc))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[h264 @ 0x98ecc0] Reinit context to 1280x720, pix_fmt: yuv420p
[graph_1_in_0_1 @ 0xc84600] tb:1/48000 samplefmt:fltp samplerate:48000
chlayout:0x3
[graph 0 input from stream 0:0 @ 0x12a3b00] w:1280 h:720 pixfmt:yuv420p
tb:1/24 fr:24/1 sar:1/1 sws_param:flags=2
[scaler_out_0_0 @ 0x12a4e40] w:720 h:576 flags:'bicubic' interl:0
[scaler_out_0_0 @ 0x12a4e40] w:1280 h:720 fmt:yuv420p sar:1/1 -> w:720
h:576 fmt:yuv420p sar:64/45 flags:0x4
[h264_nvenc @ 0x948280] Loaded Nvenc version 8.1
[h264_nvenc @ 0x948280] Nvenc initialized successfully
[h264_nvenc @ 0x948280] 1 CUDA capable devices found
[h264_nvenc @ 0x948280] [ GPU #0 - < GeForce GTX 1080 > has Compute SM 6.1
]
[h264_nvenc @ 0x948280] supports NVENC
[h264_nvenc @ 0x948280] AQ enabled.
[h264_nvenc @ 0x948280] Temporal AQ enabled.
[mpegts @ 0x948d40] muxrate 1790000, pcr every 23 pkts, sdt every 595,
pat/pmt every 119 pkts
Output #0, mpegts, to 'udp://192.168.2.100:5000?pkt_size=188':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: mp41
title : Big Buck Bunny
encoder : Lavf58.13.102
Stream #0:0(und): Video: h264 (h264_nvenc) (Main), 1 reference frame,
yuv420p(top first, left), 720x576 [SAR 64:45 DAR 16:9], q=-1--1, 1550
kb/s, 25 fps, 90k tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
encoder : Lavc58.19.101 h264_nvenc
Side data:
cpb: bitrate max/min/avg: 1550000/0/1550000 buffer size: 1550000
vbv_delay: -1
Stream #0:1(und): Audio: aac (LC), 48000 Hz, stereo, fltp, delay 1024,
128 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
encoder : Lavc58.19.101 aac
[mpegts @ 0x948d40] Invalid DTS: 7200 PTS: 3600 in output stream 0:0,
replacing by guess.468x
[mpegts @ 0x948d40] Invalid DTS: 10800 PTS: 7200 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 25200 PTS: 21600 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 28800 PTS: 25200 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 46800 PTS: 39600 in output stream 0:0,
replacing by guess957x
[mpegts @ 0x948d40] Invalid DTS: 50400 PTS: 46800 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 64800 PTS: 61200 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 68400 PTS: 64800 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 82800 PTS: 79200 in output stream 0:0,
replacing by guess97x
[mpegts @ 0x948d40] Invalid DTS: 86400 PTS: 82800 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 100800 PTS: 97200 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 104400 PTS: 100800 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 118800 PTS: 115200 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 122400 PTS: 118800 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 140400 PTS: 136800 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 144000 PTS: 140400 in output stream 0:0,
replacing by guess
[mpegts @ 0x948d40] Invalid DTS: 158400 PTS: 154800 in output stream 0:0,
replacing by guess
frame= 44 fps= 18 q=28.0 Lsize= 519kB time=00:00:02.43
bitrate=1747.7kbits/s speed=0.99x
video:404kB audio:39kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 17.295065%
Input file #0 (/home/admintv/big-buck-bunny_294_1280x720.mp4):
Input stream #0:0 (video): 59 packets read (631613 bytes); 45 frames
decoded;
Input stream #0:1 (audio): 114 packets read (38584 bytes); 113 frames
decoded (115712 samples);
Total: 173 packets (670197 bytes) demuxed
Output file #0 (udp://192.168.2.100:5000?pkt_size=188):
Output stream #0:0 (video): 44 frames encoded; 44 packets muxed (413320
bytes);
Output stream #0:1 (audio): 113 frames encoded (115712 samples); 114
packets muxed (39630 bytes);
Total: 158 packets (452950 bytes) muxed
[h264_nvenc @ 0x948280] Nvenc unloaded
[aac @ 0x923340] Qavg: 163.924
Exiting normally, received signal 2.
And video is broken as attached.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7302#comment:3>
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