[FFmpeg-user] Problem converting to mp4 with exact video bit rate
Vikram Arora
vikram.arora1985 at gmail.com
Tue Feb 13 11:16:31 EET 2018
Hi,
I am trying to convert a mp4 video file to 512k amd 1024k video bitrate,
but the converted file is only about 350k.
The command used is :
ffmpeg -i src_file.mp4 -y -ab "512k" -ac "2" -c:a "libfdk_aac" -ar "44100"
-c:v "libx264" -r "29.97" -b:v "512k" -minrate "512k" -maxrate "512k"
-bufsize "512k" -crf "23" -threads 1 dest_file.mp4
*Orig file specs are as under :*
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 69.7 MiB
Duration : 4 min 54 s
Overall bit rate mode : Variable
Overall bit rate : 1 986 kb/s
Writing application : Lavf51.12.1
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline at L2.2
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Format settings, GOP : M=1, N=12
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 4 min 54 s
Bit rate : 1 872 kb/s
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 15.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.406
Stream size : 65.7 MiB (94%)
Language : English
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 4 min 54 s
Bit rate mode : Variable
Bit rate : 111 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 spf)
Compression mode : Lossy
Stream size : 3.91 MiB (6%)
*Console Output is as under:*
ffmpeg version N-89723-g2ca65fc Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-17)
configuration: --prefix=/home/ffmpeg_build --pkg-config-flags=--static
--extra-cflags=-I/home/ffmpeg_build/include
--extra-ldflags=-L/home/ffmpeg_build/lib --extra-libs=-lpthread
--extra-libs=-lm --bindir=/home/ffmpeg_bin --enable-gpl --enable-libfdk_aac
--enable-libfreetype --enable-libmp3lame --enable-libopus
--enable-libvorbis --enable-libopencore-amrnb --enable-libx264
--enable-nonfree --enable-version3
libavutil 56. 7.100 / 56. 7.100
libavcodec 58. 9.100 / 58. 9.100
libavformat 58. 3.100 / 58. 3.100
libavdevice 58. 0.100 / 58. 0.100
libavfilter 7. 11.101 / 7. 11.101
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'NPVD0010.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 2018-01-10T13:13:52.000000Z
encoder : Lavf51.12.1
Duration: 00:04:54.48, start: 0.000000, bitrate: 1986 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 1871 kb/s, 15 fps, 15 tbr,
15 tbn, 30 tbc (default)
Metadata:
creation_time : 2018-01-10T13:15:03.000000Z
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 111 kb/s (default)
Metadata:
creation_time : 2018-01-10T13:15:03.000000Z
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x2d1b340] using SAR=1/1
[libx264 @ 0x2d1b340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x2d1b340] profile High, level 3.0
[libx264 @ 0x2d1b340] 264 - core 155 - H.264/MPEG-4 AVC codec - Copyleft
2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3
deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00
mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11
fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1
sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1
weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40
intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0
qpmax=69 qpstep=4 vbv_maxrate=512 vbv_bufsize=512 crf_max=0.0 nal_hrd=none
filler=0 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'NPVD0010.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.3.100
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p,
640x480 [SAR 1:1 DAR 4:3], q=-1--1, 512 kb/s, 29.97 fps, 11988 tbn, 29.97
tbc (default)
Metadata:
creation_time : 2018-01-10T13:15:03.000000Z
handler_name : VideoHandler
encoder : Lavc58.9.100 libx264
Side data:
cpb: bitrate max/min/avg: 512000/0/512000 buffer size: 512000
vbv_delay: -1
Stream #0:1(eng): Audio: aac (libfdk_aac) (mp4a / 0x6134706D), 44100
Hz, stereo, s16, 64 kb/s (default)
Metadata:
creation_time : 2018-01-10T13:15:03.000000Z
handler_name : SoundHandler
encoder : Lavc58.9.100 libfdk_aac
More than 1000 frames duplicated 3072kB time=00:01:04.06 bitrate=
392.8kbits/s dup=952 drop=0 speed=5.93x
frame= 8821 fps=174 q=-1.0 Lsize= 14126kB time=00:04:54.47 bitrate=
393.0kbits/s dup=4406 drop=0 speed= 5.8x
video:11512kB audio:2302kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 2.261231%
[libx264 @ 0x2d1b340] frame I:41 Avg QP:18.87 size: 20791
[libx264 @ 0x2d1b340] frame P:2755 Avg QP:22.05 size: 3511
[libx264 @ 0x2d1b340] frame B:6025 Avg QP:20.54 size: 210
[libx264 @ 0x2d1b340] consecutive B-frames: 0.6% 23.1% 5.3% 71.0%
[libx264 @ 0x2d1b340] mb I I16..4: 30.0% 27.5% 42.5%
[libx264 @ 0x2d1b340] mb P I16..4: 5.8% 4.5% 2.0% P16..4: 21.1% 3.3%
2.1% 0.0% 0.0% skip:61.3%
[libx264 @ 0x2d1b340] mb B I16..4: 0.2% 0.2% 0.0% B16..8: 10.5% 0.2%
0.0% direct: 0.3% skip:88.6% L0:28.5% L1:70.6% BI: 1.0%
[libx264 @ 0x2d1b340] 8x8 transform intra:35.8% inter:47.0%
[libx264 @ 0x2d1b340] coded y,uvDC,uvAC intra: 33.5% 45.6% 17.7% inter:
3.6% 5.8% 1.1%
[libx264 @ 0x2d1b340] i16 v,h,dc,p: 29% 47% 11% 13%
[libx264 @ 0x2d1b340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 32% 28% 2% 1%
1% 1% 2% 3%
[libx264 @ 0x2d1b340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 28% 16% 4% 4%
4% 4% 4% 4%
[libx264 @ 0x2d1b340] i8c dc,h,v,p: 39% 35% 19% 7%
[libx264 @ 0x2d1b340] Weighted P-Frames: Y:3.8% UV:2.4%
[libx264 @ 0x2d1b340] ref P L0: 76.9% 11.3% 9.4% 2.2% 0.1%
[libx264 @ 0x2d1b340] ref B L0: 83.6% 13.8% 2.7%
[libx264 @ 0x2d1b340] ref B L1: 95.2% 4.8%
[libx264 @ 0x2d1b340] kb/s:320.40
Please help to get the converted files with exact bit rates.
*Thanks,*
*Vikram*
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