视频图像学习[2]--关于ffmpeg出现muxing overhead的分析

本文讨论了在视频转码过程中遇到的高比特率音频导致的问题,并提供了两种解决方案:一是通过设定特定参数使ffmpeg自动调整降低码率;二是仅设定视频编码参数,让ffmpeg自行处理音频部分。

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这个问题对我来讲主要是由于视频中的音频数据bit率很高造成的。

那我来说,如果我转码的时候设置是 -vcodec libx264 -acodec copy 音频自动copy原始数据的话,我转的影像的bit率会与一万多

但是如果我只设定了-vcodec libx264 不管音频acodec编码的话,ffmpeg会自动调整降低码率的,1080p或者720p的每一帧bit率也只有2000左右,同时这时候音频视频同步问题也很好解决了。

v4l2-ctl -d /dev/video0 --stream-mmap --stream-count=1 --stream-to=frame.raw < nvidia@tegra-ubuntu:~$ ffmpeg -f rawvideo -pix_fmt yuyv422 -s 640x480 -i frame.raw output.jpg ffmpeg version 4.4.2-1ubuntu0.1 Copyright (c) 2000-2021 the FFmpeg developers built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04) configuration: --prefix=/usr --enable-nvv4l2dec --enable-libv4l2 --enable-shared --extra-libs='-L/usr/lib/aarch64-linux-gnu/tegra -lv4l2 -lnvbufsurface -lnvbufsurftransform' --extra-cflags=-I/usr/src/jetson_multimedia_api/include/ --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --arch=arm64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 70.100 / 56. 70.100 libavcodec 58.134.100 / 58.134.100 libavformat 58. 76.100 / 58. 76.100 libavdevice 58. 13.100 / 58. 13.100 libavfilter 7.110.100 / 7.110.100 libswscale 5. 9.100 / 5. 9.100 libswresample 3. 9.100 / 3. 9.100 libpostproc 55. 9.100 / 55. 9.100 [rawvideo @ 0xaaab010f9a30] Packet corrupt (stream = 0, dts = 0). [rawvideo @ 0xaaab010f9a30] Estimating duration from bitrate, this may be inaccurate Input #0, rawvideo, from 'frame.raw': Duration: N/A, start: 0.000000, bitrate: 122880 kb/s Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 122880 kb/s, 25 tbr, 25 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native)) Press [q] to stop, [?] for help frame.raw: corrupt input packet in stream 0 [rawvideo @ 0xaaab011046e0] Invalid buffer size, packet size 48509 < expected frame_size 614400 Error while decoding stream #0:0: Invalid argument [swscaler @ 0xaaab011103a0] deprecated pixel format used, make sure you did set range correctly Output #0, image2, to 'output.jpg': Metadata: encoder : Lavf58.76.100 Stream #0:0: Video: mjpeg, yuvj422p(pc), 640x480, q=2-31, 200 kb/s, 25 fps, 25 tbn Metadata: encoder : Lavc58.134.100 mjpeg Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A frame= 0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed= 0x video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used) Conversion failed! nvidia@tegra-ubuntu:~$
最新发布
06-13
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