Ffmpeg crf option
Scenecut 1 if the frame is a scenecut, 0 otherwise. QP Quantization Parameter decided for the frame.īits Number of bits consumed by the frame. POC Picture Order Count - The display order of the frames. The following statistics are available when -csv-log-level isĮncode Order The frame order in which the encoder encodes. If -csv-log-level is greater thanĠ, it writes one line per frame. Write encoding statistics to a Comma Separated Values log file. 1 disables all logging, except certain fatalĮrrors, and can be specified by the string “none”.ĭisable periodic progress reports from the CLI Debug levelĮnables per-frame QP, metric, and bitrate logging. Logging/Statistic Options ¶ -log-level ¶Ĭontrols the level of information displayed on the console. log-level 3 is equivalent to -log-level debug. The user may specify the integer ordinal of the value they desire. Generally, when an option expects a string value from a list of strings If there are more than two extra arguments, the CLI will This makes x265 in.y4m out.hevc a validĬommand line. There are two extra arguments, the second is treated as the outputīitstream filename, making -output also optional if the inputįilename was implied. Makes the -input specifier optional for the input file. Value) the CLI will treat it as the input filename. If there is an extra command line argument (not an option or an option Order of the arguments on the command line. The CLI does this for the user implicitly, so all CLI optionsĪre applied after the user’s preset and tune choices, regardless of the Wish to use, prior to calling x265_param_parse() to set any additionalįields. X265_param_default_preset() with the preset and tune parameters they
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Preset and tune have special implications.
#Ffmpeg crf option full#
Users of the API must pass x265_param_parse() the full option name. Long options may be truncated to the shortest unambiguous abbreviation. The CLI uses getopt to parse theĬommand line options so the short or long versions may be used and the A lower speed results in slightly better compression, while a higher speed results in slightly worse compression.Note that unless an option is listed as CLI ONLY the option is also Speed: Zencoder supports speed as a range from 1-5 for H.264. Only use this setting if you're targeting a specific device that requires it. For example, the iPhone supports H.264 Level 3, which means that a video's peak bitrate can't exceed 10,000kbps. Video_codec_level: constrains the bitrate and macroblocks. Try High for the best quality, and Baseline for mobile device support. The Main and High profiles are a definite step up in compression, and work fine for web playback. For example, some older phones only supports the Baseline profile, which we use by default. Lower levels are easier to decode, but higher levels offer better compression and extended features. Video_codec_profile: The supported H.264 profiles are: baseline, main, high, high10, high422, high444. Generally speaking, you shouldn't have to go below 16 16 is nearly lossless for most files. Valid values are 0-51, with lower values being better quality. So if you set both Quality and CRF, the CRF setting will override Quality. The Zencoder Quality setting determines an appropriate CRF for a given video. This is closely related to constant quantizer encoding, though CRF mode generally achieves better compression than constant Q encoding by reducing the quantizer quality on "less important" frames. H.264 and general optionsĬrf: CRF is a bitrate-control setting, and sets a constant ratefactor. f4v is preferred.ĪAC and MP3 audio codecs are valid alongside H.264. flv is not a recommended file extension for H.264 Flash video.
#Ffmpeg crf option mp4#
H.264 is typically deployed in the MP4 file container.
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H.264 is the dominant video codec today for web and mobile video. Zencoder encodes H.264 content using a variety of software, but our core encoder is the excellent x264, the best H.264 encoder available, and one of the best video encoding implementations for any codec. It is also an excellent codec for desktop video. H.264 can be played in 99.9% of web browsers, on many mobile devices (including the iPhone/iPad, Android), as well as many connected television and streaming devices. Its compression quality ranks among the best of the modern codecs along with HEVC and VP9. The dominant video codec today for web and mobile video is H.264.
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H.264 Advanced Guide This page documents H.264-specific encoding with Zencoder.