[FFmpeg-user] Encoding for Amazon Cloud Front HLS adaptive streaming. Peak rate too high.
Joel Lopez
badassmexican at gmail.com
Tue Nov 8 23:08:54 EET 2016
On Mon, Nov 7, 2016 at 6:27 PM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 2016-11-08 3:15 GMT+01:00 Joel Lopez <badassmexican at gmail.com>:
>> Hi,
>>
>> I'm trying to figure out how to encode with ffmpeg instead of Elastic
>> Transcoder. I wrote a bash script that outputs these commands and
>> encodes 6 files different bitrates. After the files are done I
>> segment them with ffmpeg and upload them and the .m3u8 files up to
>> Amazon S3. Once they're up I check the stream using Apple's Media
>> Stream Validator and I get the errors below the commands. What am I
>> missing in my commands to cap the bit rates?
>
> Where in your commands are you trying to cap the bitrates?
>
>> ffmpeg version 2.6.git
>
> Please understand that this is completely outdated and not supported.
>
> Carl Eugen
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> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
Hi Carl,
I have updated my ffmpeg installation. I have added -b:v -maxrate and
-bufsize to try and cap my bit rate. I seem to be only about 16% -
22% off the bit rates I'm expecting. I imagine the container or
metadata adds some. Is there anyway to further cap, calculate how
much more or use ffmpeg to extract the data when it's done encoding
and segmenting?
For example a 2350k video bit rate and a 64k audio gives me 2878.02
kb/s measured when I expect 2414 kb/s.
Error: Measured peak bitrate compared to master playlist declared
value exceeds error tolerance
--> Detail: Measured: 1347.74 kb/s, Master playlist: 1114.00 kb/s,
Error: 17.34%
--> Compare: INT_AP_01_001_1050.m3u8
--> Detail: Measured: 519.86 kb/s, Master playlist: 414.00 kb/s, Error: 20.36%
--> Compare: INT_AP_01_001_350.m3u8
--> Detail: Measured: 386.14 kb/s, Master playlist: 299.00 kb/s, Error: 22.57%
--> Compare: INT_AP_01_001_235.m3u8
--> Detail: Measured: 2878.02 kb/s, Master playlist: 2414.00 kb/s,
Error: 16.12%
--> Compare: INT_AP_01_001_2350.m3u8
--> Detail: Measured: 810.60 kb/s, Master playlist: 664.00 kb/s, Error: 18.09%
--> Compare: INT_AP_01_001_600.m3u8
--> Detail: Measured: 2180.12 kb/s, Master playlist: 1814.00 kb/s,
Error: 16.79%
--> Compare: INT_AP_01_001_1750.m3u8
Here's my command and output for the 2350k video bitrate. I do the
same command just change the bitrate for a 235k, 350k, 600k, 1050k and
a 1750k.
ffmpeg -y -t 60 -i INT_AP_01_001.mov -vf scale=1280:-2
-force_key_frames 'expr:gte(t,n_forced*2)' -c:v libx264 -preset medium
-profile:v baseline -level 3.0 -movflags +faststart -b:v 2350k
-maxrate 2350k -bufsize 2350k -g 60 -strict -2 -c:a aac -b:a 64k
-hls_list_size 0 INT_AP_01_001_2350.m3u8
ffmpeg version N-82299-g0a24587 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --prefix=/home/joel/ffmpeg_build
--pkg-config-flags=--static
--extra-cflags=-I/home/joel/ffmpeg_build/include
--extra-ldflags=-L/home/joel/ffmpeg_build/lib --bindir=/home/joel/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-nonfree
libavutil 55. 35.100 / 55. 35.100
libavcodec 57. 66.101 / 57. 66.101
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 'INT_AP_01_001.mov':
Metadata:
creation_time : 2016-08-29T23:57:33.000000Z
Duration: 00:04:01.81, start: 0.000000, bitrate: 8256 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661),
yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 1280x720 [SAR 1:1
DAR 16:9], 7997 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 29.97 tbc
(default)
Metadata:
creation_time : 2016-08-29T23:57:33.000000Z
handler_name : Apple Alias Data Handler
encoder : H264
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 255 kb/s (default)
Metadata:
creation_time : 2016-08-29T23:57:33.000000Z
handler_name : Apple Alias Data Handler
[libx264 @ 0x26a0020] using SAR=1/1
[libx264 @ 0x26a0020] frame MB size (80x45) > level limit (1620)
[libx264 @ 0x26a0020] MB rate (107892) > level limit (40500)
[libx264 @ 0x26a0020] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
[libx264 @ 0x26a0020] profile Constrained Baseline, level 3.0
Output #0, hls, to
'/home/joel/Videos/encoded_hls/INT_AP_01_001_hls10/INT_AP_01_001_2350.m3u8':
Metadata:
encoder : Lavf57.57.100
Stream #0:0(eng): Video: h264 (libx264), yuv420p, 1280x720 [SAR
1:1 DAR 16:9], q=-1--1, 2350 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
(default)
Metadata:
creation_time : 2016-08-29T23:57:33.000000Z
handler_name : Apple Alias Data Handler
encoder : Lavc57.66.101 libx264
Side data:
cpb: bitrate max/min/avg: 2350000/0/2350000 buffer size: 2350000
vbv_delay: -1
Stream #0:1(eng): Audio: aac (LC), 44100 Hz, stereo, fltp, 64 kb/s (default)
Metadata:
creation_time : 2016-08-29T23:57:33.000000Z
handler_name : Apple Alias Data Handler
encoder : Lavc57.66.101 aac
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
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video:16711kB audio:476kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: unknown
[libx264 @ 0x26a0020] frame I:59 Avg QP:17.77 size: 31324
[libx264 @ 0x26a0020] frame P:1740 Avg QP:22.89 size: 8773
[libx264 @ 0x26a0020] mb I I16..4: 61.5% 0.0% 38.5%
[libx264 @ 0x26a0020] mb P I16..4: 11.2% 0.0% 1.7% P16..4: 37.0%
6.9% 1.7% 0.0% 0.0% skip:41.5%
[libx264 @ 0x26a0020] coded y,uvDC,uvAC intra: 17.8% 60.8% 10.8%
inter: 6.4% 29.8% 0.3%
[libx264 @ 0x26a0020] i16 v,h,dc,p: 42% 28% 13% 17%
[libx264 @ 0x26a0020] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 29% 22% 5%
5% 4% 5% 4% 3%
[libx264 @ 0x26a0020] i8c dc,h,v,p: 52% 23% 21% 4%
[libx264 @ 0x26a0020] ref P L0: 75.1% 24.9%
[libx264 @ 0x26a0020] kb/s:2280.63
[aac @ 0x26a4500] Qavg: 529.314
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