Gives a notable quality boost by allowing x264 to choose between 8×8 and 4×4 frequency transform size. Required for i8x8 partitions. Speed cost for this option is near-zero both for encoding and decoding; the only reason to disable it is when one needs support on a device not compatibl...
Alternatively, you can reduce the video file size by changing the mentioned CRF value, which dynamically adjusts the bitrate to maintain a balance between quality and compression. The default is 23. For lower quality and smaller file sizes, use CRF values between 28 and 32. ffmpeg -i input....
To reduce the size of the video. This is possible by reducing the resolution of the video. If we take for example a video in HD (1920x1080 pixels) but we know that we will never see on a screen that supports a higher resolution than say 1024x768, we can reduce the video resolution...
Reduce fluctuations in QP (before curve compression) [20.0] –qblur (x264) -qblur (FFmpeg) Reduce fluctuations in QP (after curve compression) [0.5] –zones /(x264) UNKNOWN (FFmpeg) Allows setting a specific quantizer for a specific region of video. –qpfile (x264) UNKNOWN (FFmpeg) Al...
Video options: -b bitrate set bitrate (in bits/s) -vb bitrate set bitrate (in bits/s) -vframes number set the number of video frames to record -r rate set frame rate (Hz value, fraction or abbreviation) -s size set frame size (WxH or abbreviation) ...
static int video_stream_index = -1; static int64_t last_pts = AV_NOPTS_VALUE; static int open_input_file(const char *filename) { int ret; AVCodec *dec; if ((ret = avformat_open_input(&fmt_ctx, filename, NULL, NULL)) < 0) { ...
Video options:-vframes number set the number of video frames to output-r rate set frame rate(Hz value,fraction or abbreviation)-s size set frame size(WxH or abbreviation)-aspect aspect set aspect ratio(4:3,16:9or1.3333,1.7777)-bits_per_raw_sample number set the number of bits per raw...
Unofficial FFmpeg with added custom native Visual Studio project build tools. FFmpeg: A complete, cross-platform solution to record, convert and stream audio and video. - FFmpeg/libavcodec/avcodec.h at b945fed629a872d393f59d16fc5773574126ca88 · wwwxxxww
When encoding desktop videos such as the many tutorials on my site. We found it to be a lot better to simply reduce the resolution with"-s 1280x720"to bring it down to 720p. Also, drop the frame rate down to 30fps with"-r 30"in order to half the frame rate to keep the size ...
@item To have very low audio bitrates, reduce the sampling frequency (down to 22050 kHz for MPEG audio, 22050 or 11025 for AC3). @item To have a constant quality (but a variable bitrate), use the option '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst...