Ffmpegx mux audacity tempo movie#

Enables H.264 Context-Adaptive Binary Arithmetic Coding to improve entropy coding and achieve smaller files (slower).Use in combination with '5 seconds test clip' to quickly evaluate which encoding options will give the best quality and which fps you'll obtain with, so as to decide the better quality/speed tradeoff. This gives a good indication of the encoding quality which is being achieved. Returned values are in decibel, the higher the better. Prints the peak signal to noise ratio for the whole video after encoding, and stores the per-frame PSNR in 'psnr_hhmmss.log'.Also prints a more detailed output in terminal. Range is 1-31, recommended range is 10-31. Setting qmin=qmax will lead to variable bitrate encoding. Range is 1-31, though qmin=1 is not recommended. Complex frames will require more compression in order to fit in a constant bitrate, so the quantizer will vary within the qmin/qmax range in attempt to control the bitrate. More compression means smaller filesize and less image quality. The quantizer is the compression level used to encode a frame.

Don't use values higher than 300 for MPEG-4 and XviD, as quality can be affected. I-frames need more data to encode the picture.

Select the interval between I-frames or keyframes.

SAD=Sum of Absolute Differences (fastest, default), SSE =Sum of Squared Errors (better quality, fast), SATD=Sum of Absolute Hadamard Transformed Differences (a bit better than SSE, slow), RD=Rate Distortion optimal (best quality, very slow).

Sets the comparison function used for motion estimation (affects quality).

For better image quality but slower encoding, you can choose either Bicubic (best for upscaling, ie scaling to a larger size), Bilinear (best for downscaling, ie scaling to a smaller size than source), Lanczos, or Bicubic spline (sharp picture). Choose the default 'fast-bilinear' when speed is important.

Selects the algorithm used to resize the image.

Affects the resolution of macroblocks search, leading to a more precise movement detection.

Activates quarter pixel motion estimation.Finds the optimal quantization for each macroblock in the PSNR vs bitrate sense. blue =this bitrate is too high, if you choose it you will not improve quality comparing to 'green' values and you'll be wasting space on your disks (consider choosing another bitrate, or use a larger image size, though not larger than the source image size).Green =this bitrate is quite good, if you choose it you'll obtain good quality for the current image size

Ffmpegx mux audacity tempo movie#

Red =this bitrate is too low for the selected image size, if you choose it you'll be compressing your movie too much and the quality will not be acceptable with the current image size (consider choosing another bitrate, or use a smaller size) The suggested bitrates appear either in red, green or black color in the following dialog: Note that only MP3 audio is supported for 3-pass. log file, and the third pass will use those statistics to optimize the final video encoding (using the audio encoded in 1st pass). You will be then prompted for choosing a video bitrate amongst suggested options to fit in one or two CDs. The file will be encoded three times, the first one will encode only the audio audio and calculate the video bitrate (1st pass duration is about 1h30 on a G4 for an average movie). Encode in 3-pass mode, allowing better control on movie final size.