Hello,
The mpegts muxer produces invalid PCR intervals while encoding if the
framerate is increased for example from 24 to 25 fps the naive way.
A PCR interval of 120 ms is introduced every second and it's probably
caused by the added frame. The PCR delta is greater than the 100ms
specified in section 2.7.2 of ISO/IEC 13818-1.
Is there any way to force the correct PCR interval without speeding-up the
input?
Thanks.
Tested using the latest git version:
$ ffmpeg -i BigBuckBunny_320x180.mp4 -c:v libx264 -r 25 -an -t 3 -y
invalid_pcr_rate.ts
ffmpeg version N-82166-g894e7ef Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 6.2.0 (Ubuntu 6.2.0-5ubuntu12) 20161005
configuration: --prefix=/home/user/src/ffmpeg_build
--pkg-config-flags=--static
--extra-cflags=-I/home/user/src/ffmpeg_build/include
--extra-ldflags=-L/home/user/src/ffmpeg_build/lib --bindir=/home/user/bin
--enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype
--enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-libx265 --enable-x11grab
--enable-libopencore-amrnb --enable-version3 --enable-nonfree --enable-debug
libavutil 55. 35.100 / 55. 35.100
libavcodec 57. 65.100 / 57. 65.100
libavformat 57. 57.100 / 57. 57.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 66.100 / 6. 66.100
libswscale 4. 3.100 / 4. 3.100
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'BigBuckBunny_320x180.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: mp41
creation_time : 1970-01-01T00:00:00.000000Z
title : Big Buck Bunny
artist : Blender Foundation
composer : Blender Foundation
date : 2008
encoder : Lavf52.14.0
Duration: 00:09:56.46, start: 0.000000, bitrate: 867 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 702 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, 159 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
[libx264 @ 0x55e2f4ff50a0] using SAR=1/1
[libx264 @ 0x55e2f4ff50a0] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX
[libx264 @ 0x55e2f4ff50a0] profile High, level 1.2
Output #0, mpegts, to 'invalid_pcr_rate.ts':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: mp41
date : 2008
title : Big Buck Bunny
artist : Blender Foundation
composer : Blender Foundation
encoder : Lavf57.57.100
Stream #0:0(und): Video: h264 (libx264), yuv420p, 320x180 [SAR 1:1 DAR
16:9], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
encoder : Lavc57.65.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame= 72 fps=0.0 q=-1.0 Lsize= 44kB time=00:00:02.88 bitrate=
125.3kbits/s speed=15.2x
video:32kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 36.859985%
[libx264 @ 0x55e2f4ff50a0] frame I:1 Avg QP:10.00 size: 782
[libx264 @ 0x55e2f4ff50a0] frame P:24 Avg QP:18.36 size: 853
[libx264 @ 0x55e2f4ff50a0] frame B:47 Avg QP:18.40 size: 249
[libx264 @ 0x55e2f4ff50a0] consecutive B-frames: 9.7% 5.6% 12.5% 72.2%
[libx264 @ 0x55e2f4ff50a0] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x55e2f4ff50a0] mb P I16..4: 22.2% 19.9% 2.4% P16..4: 22.1%
4.7% 1.6% 0.0% 0.0% skip:27.0%
[libx264 @ 0x55e2f4ff50a0] mb B I16..4: 7.1% 6.8% 0.1% B16..8: 13.4%
0.4% 0.1% direct: 7.0% skip:65.1% L0:43.9% L1:46.7% BI: 9.4%
[libx264 @ 0x55e2f4ff50a0] 8x8 transform intra:43.6% inter:74.0%
[libx264 @ 0x55e2f4ff50a0] coded y,uvDC,uvAC intra: 9.4% 38.9% 5.9% inter:
4.9% 15.1% 0.6%
[libx264 @ 0x55e2f4ff50a0] i16 v,h,dc,p: 51% 23% 19% 7%
[libx264 @ 0x55e2f4ff50a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 15% 66% 0%
0% 0% 0% 0% 0%
[libx264 @ 0x55e2f4ff50a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 63% 8% 17% 2%
2% 2% 1% 2% 2%
[libx264 @ 0x55e2f4ff50a0] i8c dc,h,v,p: 64% 20% 15% 1%
[libx264 @ 0x55e2f4ff50a0] Weighted P-Frames: Y:70.8% UV:41.7%
[libx264 @ 0x55e2f4ff50a0] ref P L0: 73.8% 11.9% 11.1% 3.2%
[libx264 @ 0x55e2f4ff50a0] ref B L0: 90.1% 8.2% 1.7%
[libx264 @ 0x55e2f4ff50a0] ref B L1: 94.5% 5.5%
[libx264 @ 0x55e2f4ff50a0] kb/s:87.91
$ dvbsnoop -s ts -tsraw -nohexdumpbuffer -pd 3 -if invalid_pcr_rate.ts |
egrep 'discontinuity_indicator|program_clock_reference' | egrep
'program_clock_reference' -B1
...
discontinuity_indicator: 0 (0x00)
program_clock_reference:
==> program_clock_reference: 31860000 (0x01e62520) [=
PCR-Timestamp: 0:00:01.180000]
discontinuity_indicator: 0 (0x00)
program_clock_reference:
==> program_clock_reference: 35100000 (0x02179560) [=
PCR-Timestamp: 0:00:01.300000] <-- delta = 120 ms
...
discontinuity_indicator: 0 (0x00)
program_clock_reference:
==> program_clock_reference: 58860000 (0x038221e0) [=
PCR-Timestamp: 0:00:02.180000]
discontinuity_indicator: 0 (0x00)
program_clock_reference:
==> program_clock_reference: 62100000 (0x03b39220) [=
PCR-Timestamp: 0:00:02.300000] <-- delta = 120 ms
...
discontinuity_indicator: 0 (0x00)
program_clock_reference:
==> program_clock_reference: 85860000 (0x051e1ea0) [=
PCR-Timestamp: 0:00:03.180000]
discontinuity_indicator: 0 (0x00)
program_clock_reference:
==> program_clock_reference: 89100000 (0x054f8ee0) [=
PCR-Timestamp: 0:00:03.300000] <-- delta = 120 ms
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