Twitter Facebook Reddit Mail. Ingraham , a day ago. Fingas , 4 minutes ago. Activision Blizzard CEO will consider leaving if problems aren't solved quickly Bobby Kotick reportedly mentioned the possibility of a resignation in meetings with senior company leadership.
Bonifacic , 19 hours ago. Bonifacic , 21 hours ago. A newsletter a day keeps the FOMO at bay. Just enter your email and we'll take care of the rest: Subscribe Please enter a valid email address. Analogue's Pocket handheld starts shipping on December 13th Most orders should arrive by the end of the year. Bonifacic , a day ago. Sets the base path for the libaribb24 library. This is utilized for reading of configuration files for custom unicode conversions , and for dumping of non-text symbols as images under that location.
This codec decodes the bitmap subtitles used in DVDs; the same subtitles can also be found in VobSub file pairs and in some Matroska files. Specify the global palette used by the bitmaps. When stored in VobSub, the palette is normally specified in the index file; in Matroska, the palette is stored in the codec extra-data in the same format as in VobSub.
The format for this option is a string containing 16 bits hexadecimal numbers without 0x prefix separated by commas, for example 0d00ee, eed, , eaeaea, 0ce60b, ec14ed, ebff0b, 0da, 7b7b7b, d1d1d1, 7b2a0e, 0dc, 0fb, cf0dec, cfa80c, 7cb.
Only decode subtitle entries marked as forced. Some titles have forced and non-forced subtitles in the same track. Setting this flag to 1 will only keep the forced subtitles. Default value is 0. Requires the presence of the libzvbi headers and library during configuration.
You need to explicitly configure the build with --enable-libzvbi. List of teletext page numbers to decode. Pages that do not match the specified list are dropped. Set default character set used for decoding, a value between 0 and 87 see ETS , Section 15, Table Default value is -1, which does not override the libzvbi default.
This option is needed for some legacy level 1. The default format, you should use this for teletext pages, because certain graphics and colors cannot be expressed in simple text or even ASS. Formatted ASS output, subtitle pages and teletext pages are returned in different styles, subtitle pages are stripped down to text, but an effort is made to keep the text alignment and the formatting. Chops leading and trailing spaces and removes empty lines from the generated text.
This option is useful for teletext based subtitles where empty spaces may be present at the start or at the end of the lines or empty lines may be present between the subtitle lines because of double-sized teletext characters. Default value is 1. Sets the display duration of the decoded teletext pages or subtitles in milliseconds. Default value is -1 which means infinity or until the next subtitle event comes. Force transparent background of the generated teletext bitmaps.
Default value is 0 which means an opaque background. Sets the opacity of the teletext background. When you configure your FFmpeg build, all the supported bitstream filters are enabled by default. You can list all available ones using the configure option --list-bsfs.
Below is a description of the currently available bitstream filters, with their parameters, if any. Set the color range in the stream see AV1 section 6. Set the chroma sample location in the stream see AV1 section 6. This can only be set for streams. Set the number of ticks in each picture, to indicate that the stream has a fixed framerate. Add extradata to the beginning of the filtered packets except when said packets already exactly begin with the extradata that is intended to be added.
For example the following ffmpeg command forces a global header thus disabling individual packet headers in the H. Certain codecs allow the long-term headers e. MPEG-2 sequence headers, or H. This latter form is called "extradata" in FFmpeg terminology.
When this option is enabled, the long-term headers are removed from the bitstream after extraction. List of unit types or ranges of unit types to pass through while removing all others.
Extradata is unchanged by this transformation, but note that if the stream contains inline parameter sets then the output may be unusable if they are removed. This is the smallest time unit representable in the stream, and in many cases represents the field rate of the stream double the frame rate.
Set whether the stream has fixed framerate - typically this indicates that the framerate is exactly half the tick rate, but the exact meaning is dependent on interlacing and the picture structure see H. These bits were reserved in a previous version of the H. The result of zeroing this is still a valid bitstream. Set the frame cropping offsets in the SPS. These values will replace the current ones if the stream is already cropped. These fields are set in pixels. Note that some sizes may not be representable if the chroma is subsampled or the stream is interlaced see H.
Insert a string as SEI unregistered user data. Convert an H. This is required by some streaming formats, typically the MPEG-2 transport stream format muxer mpegts. For example to remux an MP4 file containing an H. This applies a specific fixup to some Blu-ray streams which contain redundant PPSs modifying irrelevant parameters of the stream which confuse other transformations which require correct extradata.
Note that it is likely to be overridden by container parameters when the stream is in a container. Set the conformance window cropping offsets in the SPS. Note that some sizes may not be representable if the chroma is subsampled H. This filter only applies to the mpeg2video codec, and is likely not needed for Final Cut Pro 7 and newer with the appropriate -tag:v.
The individual frames can be extracted without loss, e. Avery Lee, writing in the rec. The exact table necessary is given in the OpenDML spec. Extract a representable text file from MOV subtitles, stripping the metadata header from each subtitle packet. Any other value will result in square pixels being signalled instead see H. Set the frame rate in the stream. This is constructed from a table of known values combined with a small multiplier and divisor - if the supplied value is not exactly representable, the nearest representable value will be used instead see H.
Damages the contents of packets or simply drops them without damaging the container. Accepts an expression whose evaluation per-packet determines how often bytes in that packet will be modified.
A value below 0 will result in a variable frequency. Default is 0 which results in no modification. However, if neither amount nor drop is specified, amount will be set to See below for accepted variables. Accepts an expression evaluated per-packet whose value determines whether that packet is dropped. Evaluation to a positive value results in the packet being dropped.
Evaluation to a negative value results in a variable chance of it being dropped, roughly inverse in proportion to the magnitude of the value. Default is 0 which results in no drops.
Accepts a non-negative integer, which assigns a variable chance of it being dropped, roughly inverse in proportion to the value. This option is kept for backwards compatibility and is equivalent to setting drop to a negative value with the same magnitude i. Ignored if drop is also specified. Both amount and drop accept expressions containing the following variables:.
Drop every video packet not marked as a keyframe after timestamp 30s but do not modify any of the remaining packets. Repacketize PCM audio to a fixed number of samples per packet or a fixed packet rate per second. This is similar to the ffmpeg-filters asetnsamples audio filter but works on audio packets instead of audio frames. Set the number of samples per each output audio packet. The number is intended as the number of samples per each channel.
Default value is This option makes the filter output a fixed number of packets per second instead of a fixed number of samples per packet. If the audio sample rate is not divisible by the frame rate then the number of samples will not be constant but will vary slightly so that each packet will start as close to the frame boundary as possible.
The demux timestamp in input in case of ts or dts option or presentation timestamp in case of pts option. The original position in the file of the packet, or undefined if undefined for the current packet. Log trace output containing all syntax elements in the coded stream headers everything above the level of individual coded blocks. This can be useful for debugging low-level stream issues. Supports AV1, H. Set the color space value in the frame header.
Set the color range value in the frame header. Note that any value imposed by the color space will take precedence over this value. Merge VP9 invisible alt-ref frames back into VP9 superframes. Given a VP9 stream with correct timestamps but possibly out of order, insert additional show-existing-frame packets to correct the ordering. The libavformat library provides some generic global options, which can be set on all the muxers and demuxers.
In addition each muxer or demuxer may support so-called private options, which are specific for that component. Set probing size in bytes, i. A higher value will enable detecting more information in case it is dispersed into the stream, but will increase latency. Must be an integer not lesser than It is by default.
Stop muxing at the end of the shortest stream. Specify how many microseconds are analyzed to probe the input. A higher value will enable detecting more accurate information, but will increase latency. Set error detection flags. Set maximum buffering duration for interleaving. The duration is expressed in microseconds, and defaults to 10 seconds. To ensure all the streams are interleaved correctly, libavformat will wait until it has at least one packet for each stream before actually writing any packets to the output file.
When some streams are "sparse" i. This field specifies the maximum difference between the timestamps of the first and the last packet in the muxing queue, above which libavformat will output a packet regardless of whether it has queued a packet for all the streams. If set to 0, libavformat will continue buffering packets until it has a packet for each stream, regardless of the maximum timestamp difference between the buffered packets.
Shift timestamps to make them non-negative. Also note that this affects only leading negative timestamps, and not non-monotonic negative timestamps. When shifting is enabled, all output timestamps are shifted by the same amount. Audio, video, and subtitles desynching and relative timestamp differences are preserved compared to how they would have been without shifting. Default is -1 auto , which means that the underlying protocol will decide, 1 enables it, and has the effect of reducing the latency, 0 disables it and may increase IO throughput in some cases.
Specifying a positive offset means that the corresponding streams are delayed bt the time duration specified in offset.
Default value is 0 meaning that no offset is applied. Specifies the maximum number of streams. This can be used to reject files that would require too many resources due to a large number of streams. Skip estimation of input duration when calculated using PTS.
Specify how strictly to follow the standards. Demuxers are configured elements in FFmpeg that can read the multimedia streams from a particular type of file. When you configure your FFmpeg build, all the supported demuxers are enabled by default. You can list all available ones using the configure option --list-demuxers. Use -formats to view a combined list of enabled demuxers and muxers. This demuxer is used to demux APNG files. All headers, but the PNG signature, up to but not including the first fcTL chunk are transmitted as extradata.
Default framerate in frames per second when none is specified in the file 0 meaning as fast as possible. Default is This demuxer reads a list of files and other directives from a text file and demuxes them one after the other, as if all their packets had been muxed together.
The timestamps in the files are adjusted so that the first file starts at 0 and each next file starts where the previous one finishes. Note that it is done globally and may cause gaps if all streams do not have exactly the same length. The duration of each file is used to adjust the timestamps of the next file: if the duration is incorrect because it was computed using the bit-rate or because the file is truncated, for example , it can cause artifacts.
The duration directive can be used to override the duration stored in each file. The following directive is recognized:. Path to a file to read; special characters and spaces must be escaped with backslash or single quotes. To make FFmpeg recognize the format automatically, this directive must appear exactly as is no extra space or byte-order-mark on the very first line of the script.
Duration of the file. This information can be specified from the file; specifying it here may be more efficient or help if the information from the file is not available or accurate. If the duration is set for all files, then it is possible to seek in the whole concatenated video. In point of the file. When the demuxer opens the file it instantly seeks to the specified timestamp. Seeking is done so that all streams can be presented successfully at In point.
This directive works best with intra frame codecs, because for non-intra frame ones you will usually get extra packets before the actual In point and the decoded content will most likely contain frames before In point too. For each file, packets before the file In point will have timestamps less than the calculated start timestamp of the file negative in case of the first file , and the duration of the files if not specified by the duration directive will be reduced based on their specified In point.
Because of potential packets before the specified In point, packet timestamps may overlap between two concatenated files.
Out point of the file. When the demuxer reaches the specified decoding timestamp in any of the streams, it handles it as an end of file condition and skips the current and all the remaining packets from all streams.
Out point is exclusive, which means that the demuxer will not output packets with a decoding timestamp greater or equal to Out point. This directive works best with intra frame codecs and formats where all streams are tightly interleaved. For non-intra frame codecs you will usually get additional packets with presentation timestamp after Out point therefore the decoded content will most likely contain frames after Out point too.
If your streams are not tightly interleaved you may not get all the packets from all streams before Out point and you may only will be able to decode the earliest stream until Out point. The duration of the files if not specified by the duration directive will be reduced based on their specified Out point. Metadata of the packets of the file. The specified metadata will be set for each file packet. You can specify this directive multiple times to add multiple metadata entries.
Introduce a stream in the virtual file. All subsequent stream-related directives apply to the last introduced stream. Some streams properties must be set in order to allow identifying the matching streams in the subfiles.
If no streams are defined in the script, the streams from the first file are copied. Set the id of the stream. If this directive is given, the string with the corresponding id in the subfiles will be used. If set to 1, reject unsafe file paths and directives. A file path is considered safe if it does not contain a protocol specification and is relative and all components only contain characters from the portable character set letters, digits, period, underscore and hyphen and have no period at the beginning of a component.
If set to 1, try to perform automatic conversions on packet data to make the streams concatenable. The default is 1. This is necessary in particular if there are resolution changes.
If set to 1, every packet will contain the lavf. The duration metadata is only set if it is known based on the concat file. The default is 0. This demuxer presents all AVStreams found in the manifest. By setting the discard flags on AVStreams the caller can decide which streams to actually receive. KUX is a flv variant used on the Youku platform.
Set the minimum valid delay between frames in hundredths of seconds. Range is 0 to Default value is 2. Set the maximum valid delay between frames in hundredth of seconds. Default value is nearly eleven minutes , the maximum value allowed by the specification.
Set the default delay between frames in hundredths of seconds. GIF files can contain information to loop a certain number of times or infinitely. If set to 0, then looping will occur and will cycle the number of times according to the GIF. Note that in the above example the shortest option for overlay filter is used to end the output video at the length of the shortest input file, which in this case is input.
This demuxer presents all AVStreams from all variant streams. The id field is set to the bitrate variant index number. The maximum number of times to load m3u8 when it refreshes without new segments.
This demuxer reads from a list of image files specified by a pattern. The pattern may contain a suffix which is used to automatically determine the format of the images contained in the files.
The size, the pixel format, and the format of each image must be the same for all the files in the sequence.
Disable pattern matching, therefore the video will only contain the specified image. You should use this option if you do not want to create sequences from multiple images and your filenames may contain special pattern characters. Select a sequence pattern type, used to specify a sequence of files indexed by sequential numbers.
The pattern is interpreted like a glob pattern. This is only selectable if libavformat was compiled with globbing support. Set the pixel format of the images to read. If not specified the pixel format is guessed from the first image file in the sequence.
Set the index of the file matched by the image file pattern to start to read from. Default value is 5. If set to 1, will set frame timestamp to modification time of image file. Note that monotonity of timestamps is not provided: images go in the same order as without this option.
If set to 2, will set frame timestamp to the modification time of the image file in nanosecond precision. Set the video size of the images to read.
If not specified the video size is guessed from the first image file in the sequence. If set to 1, will add two extra fields to the metadata found in input, making them also available for other filters see drawtext filter for examples. The extra fields are described below:.
Set the index of which track to demux. The demuxer can only export one track. Track indexes start at 0. Default is to pick the first track. Number of tracks is exported as tracks metadata entry. The demuxer buffers the entire file into memory. Adjust this value to set the maximum buffer size, which in turn, acts as a ceiling for the size of files that can be read.
Default is 50 MiB. It will export one 2-channel bit Optionally, a pal8 color video stream can be exported with or without printed metadata. Range is 0 to MiB. Default is 5 MiB. String which is evaluated using the eval API to assign colors to the generated video stream.
Variables which can be used are x , y , w , h , t , speed , tempo , order , pattern and row. Range is Print metadata on video stream. Includes speed , tempo , order , pattern , row and ts time in ms. Can be 1 on or 0 off. Default is 1. Set the subsong index. Subsong indexes start at 0. Set the channel layout. Valid values are 1, 2, and 4 channel layouts.
Set the sample rate for libopenmpt to output. The value default is Enable loading of external tracks, disabled by default. Enabling this can theoretically leak information in some use cases. Allows loading of external tracks via absolute paths, disabled by default.
Enabling this poses a security risk. It should only be enabled if the source is known to be non-malicious. When seeking, identify the closest point in each stream individually and demux packets in that stream from identified point. This can lead to a different sequence of packets compared to demuxing linearly from the beginning. Default is true. Ignore any edit list atoms. The demuxer, by default, modifies the stream index to reflect the timeline described by the edit list. Default is false.
Modify the stream index to reflect the timeline described by the edit list. Note that chapters are only parsed when input is seekable. Default is enabled, which will prefer to use the tfdt box to set DTS. Export unrecognized boxes within the udta box as metadata entries. The first four characters of the box type are set as the key.
It has been pre-set so should not be necessary to specify. Audible AAX files are encrypted M4B files, and they can be decrypted by specifying a 4 byte activation secret.
Output option carrying the raw packet size in bytes. Show the detected raw packet size, cannot be set by the user. Scan and combine all PMTs. The value is an integer with value from -1 to 1 -1 means automatic setting, 1 means enabled, 0 means disabled. Turning this option on by setting it to 1 will result in a stricter check of the boundary value. This demuxer allows one to read raw video data. Since there is no header specifying the assumed video parameters, the user must specify them in order to be able to decode the data correctly.
For example to read a rawvideo file input. A SBG script looks like that:. A SBG script can mix absolute and relative timestamps. If the script uses either only absolute timestamps including the script start time or only relative ones, then its layout is fixed, and the conversion is straightforward.
On the other hand, if the script mixes both kind of timestamps, then the NOW reference for relative timestamps will be taken from the current time of day at the time the script is read, and the script layout will be frozen according to that reference. TED does not provide links to the captions, but they can be guessed from the page. Set the start time of the TED talk, in milliseconds.
The default is 15s. It is used to sync the captions with the downloadable videos, because they include a 15s intro. Due to security concerns, Vapoursynth scripts will not be autodetected so the input format has to be forced. The demuxer buffers the entire script into memory.
Adjust this value to set the maximum buffer size, which in turn, acts as a ceiling for the size of scripts that can be read. Default is 1 MiB. By using the ffmetadata muxer and demuxer it is possible to extract metadata from an input file to an ffmetadata file, and then transcode the file into an output file with the edited ffmetadata file. The libavformat library provides some generic global options, which can be set on all the protocols.
In addition each protocol may support so-called private options, which are specific for that component. Set a ","-separated list of allowed protocols. Protocols prefixed by "-" are disabled. All protocols are allowed by default but protocols used by an another protocol nested protocols are restricted to a per protocol subset. Protocols are configured elements in FFmpeg that enable access to resources that require specific protocols.
When you configure your FFmpeg build, all the supported protocols are enabled by default. You can list all available ones using the configure option "—list-protocols". A separate AMQP broker must also be run. Where hostname and port default is is the address of the broker. The default for both fields is "guest". Name of virtual host on broker can be set with vhost.
Sets the exchange to use on the broker. RabbitMQ has several predefined exchanges: "amq. Sets the routing key. The default value is "amqp". The routing key is used on the "amq. Minimum is and max is any large value representable by an int. When receiving packets, this sets an internal buffer size in FFmpeg. It should be equal to or greater than the size of the published packets to the broker.
Otherwise the received message may be truncated causing decoding errors. The timeout in seconds during the initial connection to the broker. Delivery mode set to "persistent" 2. Delivery mode set to "non-persistent" 1. For example to read a sequence of files split1. Special characters must be escaped with backslash or single quotes. See ffmpeg-utils the "Quoting and escaping" section in the ffmpeg-utils 1 manual. Data in-line in the URI. Depending on the build, an URL that looks like a Windows path with the drive letter at the beginning will also be assumed to be a file URL usually not the case in builds for unix-like systems.
For example to read from a file input. Truncate existing files on write, if set to 1. A value of 0 prevents truncating. Setting this value reasonably low improves user termination request reaction time, which is valuable for files on slow medium. If set to 1, the protocol will retry reading at the end of the file, allowing reading files that still are being written. Controls if seekability is advertised on the file.
Many demuxers handle seekable and non-seekable resources differently, overriding this might speed up opening certain files at the cost of losing some features e.
By default it is set to -1, which means that the timeout is not specified. Set a user to be used for authenticating to the FTP server. Set a password to be used for authenticating to the FTP server. Control seekability of connection during encoding. If set to 1 the resource is supposed to be seekable, if set to 0 it is assumed not to be seekable. NOTE: Protocol can be used as output, but it is recommended to not do it, unless special care is taken tests, customized server configuration etc.
Different FTP servers behave in different way during seek operation. The M3U8 playlists describing the segments can be remote HTTP resources or local files, accessed using the standard file protocol. Using this protocol is discouraged - the hls demuxer should work just as well if not, please report the issues and is more complete.
To use the hls demuxer instead, simply use the direct URLs to the m3u8 files. Control seekability of connection. If set to 1 the resource is supposed to be seekable, if set to 0 it is assumed not to be seekable, if set to -1 it will try to autodetect if it is seekable.
Set custom HTTP headers, can override built in default headers. The value must be a string encoding the headers. Override the User-Agent header. If not specified the protocol will use a string describing the libavformat build.
A comma separated list of HTTP status codes to reconnect on. The list can include specific status codes e. If the server supports ICY metadata, and icy was set to 1, this contains the last non-empty metadata packet sent by the server. It should be polled in regular intervals by applications interested in mid-stream metadata updates.
Set the cookies to be sent in future requests. Multiple cookies can be delimited by a newline character. When used as a server option it sets the HTTP method that is going to be expected from the client s.
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