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13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
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ffmpeg and nvidia acceleration, need better results
25 août 2022, par StephanI've been trying to figure out the best way to use the nvenc hardware acceleration in ffmpeg to convert some older, larger avi files to MP4. My issue is the default x264 settings generate a good file size with settings that don't seem to replicate when you use the h264_nvenc codec.


First we have the original AVI...


General
Complete name : input.avi
Format : AVI
Format/Info : Audio Video Interleave
Format profile : OpenDML
File size : 1.55 GiB
Duration : 2 h 14 min
Overall bit rate : 1 643 kb/s
Writing application : Lavf52.91.0

Video
ID : 0
Format : MPEG-4 Visual
Format profile : Simple@L1
Format settings, BVOP : No
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : FMP4
Duration : 2 h 14 min
Bit rate : 1 500 kb/s
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.163
Stream size : 1.41 GiB (91%)
Writing library : Lavc52.101.0

Audio
ID : 1
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Format settings : Joint stereo / MS Stereo
Codec ID : 55
Codec ID/Hint : MP3
Duration : 2 h 14 min
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 2 channels
Sampling rate : 44.1 kHz
Compression mode : Lossy
Stream size : 124 MiB (8%)
Alignment : Aligned on interleaves
Interleave, duration : 26 ms (0.78 video frame)


If we use the default x264 settings and no hardware acceleration for encoding


ffmpeg.exe -i .\input.avi -c:v libx264 -c:a aac "output x264.mp4"


General
Complete name : output x264.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 886 MiB
Duration : 2 h 14 min
Overall bit rate : 918 kb/s
Writing application : Lavf59.27.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2 h 14 min
Bit rate : 780 kb/s
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.085
Stream size : 753 MiB (85%)
Writing library : x264 core 164 r3095 baee400
Encoding settings : 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=12 / lookahead_threads=2 / 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 / ip_ratio=1.40 / aq=1:1.00
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 2 h 14 min
Source duration : 2 h 14 min
Source_Duration_LastFrame : -17 ms
Bit rate mode : Constant
Bit rate : 132 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 126 MiB (14%)
Source stream size : 126 MiB (14%)
Default : Yes
Alternate group : 1


Then we try with default h264_nvenc codec and the file is larger than the original, but also noticing there are different default encoding settings.


ffmpeg.exe -hwaccel auto -i .\input.avi -c:v h264_nvenc -c:a aac "output x264 nvenc.mp4"


General
Complete name : output x264 nvenc.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 2.01 GiB
Duration : 2 h 14 min
Overall bit rate mode : Variable
Overall bit rate : 2 134 kb/s
Writing application : Lavf58.29.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2 h 14 min
Bit rate mode : Variable
Bit rate : 1 999 kb/s
Maximum bit rate : 6 000 kb/s
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.217
Stream size : 1.88 GiB (94%)
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 2 h 14 min
Duration_LastFrame : -17 ms
Bit rate mode : Constant
Bit rate : 129 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 124 MiB (6%)
Default : Yes
Alternate group : 1


So the question is how can I get the same results (or better) while using the acceleration from nvidia codecs ? My GPU can decode this file around 600 FPS, where as the CPU on standard x264 is under 100 FPS.


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Is there any way to record the headless firefox driver(selenium) other than xvfb
28 juillet 2022, par Saran RajRecently i have recorded the headless selenium driver using xvfb and ffmpeg.But my clients has asked me to record the driver without xvfb.So,i have to find any other way to record the headless driver.I know that this question is ridiculous but is there any way to record the headless driver without using xvfb


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I get black screen when i record the headless selenium driver with xvfb and ffmpeg [closed]
28 juillet 2022, par Saran Rajxvfb-run —listen-tcp —server-num 44 -s "-ac -screen 0 1920x1080x24" mvn clean test &

export DISPLAY=:44

ffmpeg -f x11grab -video_size 1920x1080 -i :44 -codec:v libx264 -r 12 video.mp4

This is the bash script i am using to run the selenium test cases(in headless mode) with maven as the build tool in port 44 and capture it.
But when i execute it i only get a black screen. What to do ?


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