Re: [FFmpeg-user] problem with limitng output bitrate and VBV underflow warning
> > > And you wonder why the encoder can't lower quality enough to stay within > the buffer you set? > I set this to 69 and the problem is solved. thanks ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] problem with limitng output bitrate and VBV underflow warning
On 2017-04-09 10:26, negin tebyani wrote: > -qmax 35 And you wonder why the encoder can't lower quality enough to stay within the buffer you set? signature.asc Description: OpenPGP digital signature ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] problem with limitng output bitrate and VBV underflow warning
On Sun, Apr 09, 2017 at 12:56:01 +0430, negin tebyani wrote: > I am using this commad to transcode a video with 12000k bitrate to a lower > bitrate like 300k. > > here is my command: > > ffmpeg -i 12000.mp4 -movflags faststart -c:v libx264 -x264opts > 'keyint=288:min-keyint=24:8x8dct:sliced-threads=0' -deblock 1:1 -flags > +loop -b:v 300k -maxrate 300k -bufsize 1000k -tune psnr -vf > "scale=-1280:720:flags=spline+full_chroma_inp+full_chroma_int+accurate_rnd+bitexact" > -acodec libfdk_aac -b:a 320k -coder 1 -me_range 16 -sc_threshold 42 -bf 10 > -q:v 1 -qmin 0 -qmax 35 -trellis 2 -mbtree 1 -mixed-refs 1 -preset veryslow > video.mp4 [...] > here is my console output: > > [libx264 @ 0x20bb0c0] VBV underflow (frame 2992, -20064 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2993, -13888 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2995, -520 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2996, -992 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2997, -1320 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2998, -9528 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2999, -744 bits) > [mp4 @ 0x20ba1e0] Starting second pass: moving the moov atom to the > beginning of the file > frame= 3000 fps= 13 q=-1.0 Lsize= 18665kB time=00:01:00.01 > bitrate=2547.9kbits/s negin, on this list you are kindly asked to provide the actual command line you are using, along with the complete, uncut console output. In your e-mail, you are omitting important information. Furthermore, I can see (guess!) that you are using a rather old version of ffmpeg. (I would know for sure if you had provided the complete console output.) We also kindly ask you to try with the latest version first, before reporting. If you can't build for yourself, you can find binaries built from git master both for Linux (http://johnvansickle.com/ffmpeg/) and Windows (https://www.johnvansickle.com/ffmpeg/). Choose "git", not "release". > I need the bitrate to be 2000, but after using this command and using media > info, I see that bitrate is different from what I specified (2000 for > ecample) and there is a nominal bitrate which is what I specified in my > command. The mediainfo output you provided in the other e-mail is for a 300k encoding, not a 2000k encoding. Please don't mix up cases! Output from ffprobe instead of mediainfo should be just fine, BTW, unless mediainfo is telling you something ffprobe isn't. > [libx264 @ 0x20bb0c0] VBV underflow (frame 2992, -20064 bits) I don't know anything about this though. ;-) > https://streamable.com/e6dbg Which is totally different (and thereby irrelevant), because that site apparently re-encodes your uploaded video. Mixing up all these things is making it really difficult to understand the actual issue. Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] problem with limitng output bitrate and VBV underflow warning
I am using this commad to transcode a video with 12000k bitrate to a lower bitrate like 300k. here is my command: ffmpeg -i 12000.mp4 -movflags faststart -c:v libx264 -x264opts 'keyint=288:min-keyint=24:8x8dct:sliced-threads=0' -deblock 1:1 -flags +loop -b:v 300k -maxrate 300k -bufsize 1000k -tune psnr -vf "scale=-1280:720:flags=spline+full_chroma_inp+full_chroma_int+accurate_rnd+bitexact" -acodec libfdk_aac -b:a 320k -coder 1 -me_range 16 -sc_threshold 42 -bf 10 -q:v 1 -qmin 0 -qmax 35 -trellis 2 -mbtree 1 -mixed-refs 1 -preset veryslow video.mp4 I need the bitrate to be 2000, but after using this command and using media info, I see that bitrate is different from what I specified (2000 for ecample) and there is a nominal bitrate which is what I specified in my command. and during the convert process i get the VBV underflow warning after a short time passes. until that warning hasn't showed up, the bitrate seems to be fine. but after that the bitrate starts to get higher. here is my console output: [libx264 @ 0x20bb0c0] VBV underflow (frame 2992, -20064 bits) [libx264 @ 0x20bb0c0] VBV underflow (frame 2993, -13888 bits) [libx264 @ 0x20bb0c0] VBV underflow (frame 2995, -520 bits) [libx264 @ 0x20bb0c0] VBV underflow (frame 2996, -992 bits) [libx264 @ 0x20bb0c0] VBV underflow (frame 2997, -1320 bits) [libx264 @ 0x20bb0c0] VBV underflow (frame 2998, -9528 bits) [libx264 @ 0x20bb0c0] VBV underflow (frame 2999, -744 bits) [mp4 @ 0x20ba1e0] Starting second pass: moving the moov atom to the beginning of the file frame= 3000 fps= 13 q=-1.0 Lsize= 18665kB time=00:01:00.01 bitrate=2547.9kbits/s video:16252kB audio:2346kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.363480% [libx264 @ 0x20bb0c0] frame I:15Avg QP:30.80 size: 46683 [libx264 @ 0x20bb0c0] frame P:592 Avg QP:31.14 size: 16537 [libx264 @ 0x20bb0c0] frame B:2393 Avg QP:34.69 size: 2570 [libx264 @ 0x20bb0c0] consecutive B-frames: 0.8% 3.3% 5.4% 9.6% 3.3% 76.2% 0.7% 0.0% 0.6% 0.0% 0.0% [libx264 @ 0x20bb0c0] mb I I16..4: 37.0% 48.8% 14.2% [libx264 @ 0x20bb0c0] mb P I16..4: 9.1% 9.4% 1.0% P16..4: 24.2% 7.5% 5.7% 0.8% 0.1%skip:42.2% [libx264 @ 0x20bb0c0] mb B I16..4: 0.4% 0.2% 0.0% B16..8: 17.9% 4.2% 0.7% direct: 0.9% skip:75.6% L0:37.7% L1:49.0% BI:13.3% [libx264 @ 0x20bb0c0] 8x8 transform intra:46.4% inter:49.8% [libx264 @ 0x20bb0c0] direct mvs spatial:99.9% temporal:0.1% [libx264 @ 0x20bb0c0] coded y,uvDC,uvAC intra: 18.8% 27.9% 7.3% inter: 5.6% 3.5% 0.3% [libx264 @ 0x20bb0c0] i16 v,h,dc,p: 29% 46% 10% 15% [libx264 @ 0x20bb0c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 19% 55% 3% 2% 3% 3% 2% 3% [libx264 @ 0x20bb0c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 30% 17% 3% 5% 6% 5% 4% 4% [libx264 @ 0x20bb0c0] i8c dc,h,v,p: 65% 20% 8% 6% [libx264 @ 0x20bb0c0] Weighted P-Frames: Y:5.6% UV:4.6% [libx264 @ 0x20bb0c0] ref P L0: 57.1% 15.8% 13.9% 3.3% 2.4% 1.7% 1.3% 0.6% 0.6% 0.8% 0.5% 0.4% 0.4% 0.4% 0.4% 0.3% [libx264 @ 0x20bb0c0] ref B L0: 84.1% 9.0% 2.3% 1.4% 0.6% 0.6% 0.6% 0.2% 0.2% 0.3% 0.2% 0.2% 0.1% 0.1% 0.1% [libx264 @ 0x20bb0c0] ref B L1: 96.4% 3.6% [libx264 @ 0x20bb0c0] kb/s:2218.78 and here is a demo of video: https://streamable.com/e6dbg ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] problem with limitng output bitrate and VBV underflow warning
forgot to show mediainfo output: General Complete name: 300from12000.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom File size: 18.2 MiB Duration : 1mn 0s Overall bit rate : 2 547 Kbps Writing application : Lavf56.25.101 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L5.0 Format settings, CABAC : Yes Format settings, ReFrames: 16 frames Codec ID : avc1 Codec ID/Info: Advanced Video Coding Duration : 1mn 0s Bit rate : 2 219 Kbps Nominal bit rate : 300 Kbps Width: 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 50.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth: 8 bits Scan type: Progressive Bits/(Pixel*Frame) : 0.048 Stream size : 15.9 MiB (87%) Writing library : x264 core 142 r2495 6a301b6 Encoding settings: cabac=1 / ref=16 / deblock=1:1:1 / analyse=0x3:0x133 / me=umh / subme=10 / psy=0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=4 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=10 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=288 / keyint_min=24 / scenecut=42 / intra_refresh=0 / rc_lookahead=60 / rc=cbr / mbtree=1 / bitrate=300 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=35 / qpstep=4 / vbv_maxrate=300 / vbv_bufsize=1000 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:0.00 Language : English Audio ID : 2 Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Codec ID : 40 Duration : 1mn 0s Duration_LastFrame : -11ms Bit rate mode: Constant Bit rate : 320 Kbps Channel count: 2 channels Channel positions: Front: L R Sampling rate: 48.0 KHz Compression mode : Lossy Delay relative to video : 40ms Stream size : 2.29 MiB (13%) Language : English On Sun, Apr 9, 2017 at 12:56 PM, negin tebyani wrote: > I am using this commad to transcode a video with 12000k bitrate to a lower > bitrate like 300k. > > here is my command: > > ffmpeg -i 12000.mp4 -movflags faststart -c:v libx264 -x264opts > 'keyint=288:min-keyint=24:8x8dct:sliced-threads=0' -deblock 1:1 -flags > +loop -b:v 300k -maxrate 300k -bufsize 1000k -tune psnr -vf > "scale=-1280:720:flags=spline+full_chroma_inp+full_chroma_int+accurate_rnd+bitexact" > -acodec libfdk_aac -b:a 320k -coder 1 -me_range 16 -sc_threshold 42 -bf 10 > -q:v 1 -qmin 0 -qmax 35 -trellis 2 -mbtree 1 -mixed-refs 1 -preset veryslow > video.mp4 > > I need the bitrate to be 2000, but after using this command and using > media info, I see that bitrate is different from what I specified (2000 for > ecample) and there is a nominal bitrate which is what I specified in my > command. > > and during the convert process i get the VBV underflow warning after a > short time passes. until that warning hasn't showed up, the bitrate seems > to be fine. but after that the bitrate starts to get higher. > > here is my console output: > > [libx264 @ 0x20bb0c0] VBV underflow (frame 2992, -20064 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2993, -13888 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2995, -520 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2996, -992 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2997, -1320 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2998, -9528 bits) > [libx264 @ 0x20bb0c0] VBV underflow (frame 2999, -744 bits) > [mp4 @ 0x20ba1e0] Starting second pass: moving the moov atom to the > beginning of the file > frame= 3000 fps= 13 q=-1.0 Lsize=
