MP4Box

Descrição

MP4Box - MPEG-4 Caixa de ferramentas do sistema SYNOPSE

MP4Box [opções] arquivo [opções]

MP4Box é uma ferramenta de comando de linha multi-propósito para criar e editar apresentações MPEG-4 Systems e manipular arquivos ISO-mídia (MP4, 3GP, MOV).

MP4Box suporta a conversão de arquivos de vários formatos "crús" e IsoMedia / AVI / MPEG-PS / OGG containers, arquivos hint para RTP streaming para servidores de streaming compatíveis com QuickTime, intercalando arquivo, fragmentação de arquivos e extração de track.

MP4Box também fornece ferramentas dump usados ​​para inspecionar layout de arquivo, faixas hint RTP, informações SDP, composição de cena. Também pode ser usado para converter para e de BT/XMT-A/VRML/X3D.

MP4Box também possui codificadores MPEG-4 Systems e decodificadores para BIFs e ferramentas de OD.

MP4Box não espera nenhuma ordem específica nas opções no prompt.

Obtendo ajuda com MP4Box

-h [type]

   imprime a tela de ajuda. "type" pode ser um dos "general", "hint", "import", "encode", "extract", "dump", "swf", "meta", "crypt", "format" para ajuda específica.

-version

   imprime a versão do MP4Box.

-nodes

   lista os MPEG-4 nós sistemas suportados na versão MP4Box corrente.

-node NodeName

   imprime a sintaxe do nó. Cada campo é listado como informação de eventType fieldType fieldName defaultValue e quantização de field e quantização de limites se houver.

Opções Gerais

-inter duration

   interleaves media data in chunks of the maximum specified duration (expressed in milliseconds) and prepare file for HTTP/FTP streaming. By default MP4Box always stores with 0.5 second interleaving. An interleaving value of '0' stores without interleaving (meta-data then track after track).
   intercala dados de media em pedaços de durações especificadas máximas (expressadas em milesegundos) e prepara o arquivo para streaming HTTP/FTP. Por default MP4Box sempre armazena 0,5 segundos 

   NOTE: Track Edit Lists are ignored when performing interleaving.

-flat

   stores file with all media data first, non interleaved. If used when creating a new file, no temporary file is created (faster storage).

-frag duration

   fragments file using ISO-Media movie fragments. Tracks will be fragmented so that no track run exceeds the specified duration (expressed in milliseconds). Disables interleaving.

-out <filename>

   specifies output file name.

-tmp <dirname>

   specifies driectory for temporary storage. If not set, temporary storage is OS-dependent.

-nosys

   removes all MPEG-4 Systems information from the file but keeps an empty IOD for MPEG-4 Profile@Level indications.

-isma

   rewrites the file as an ISMA 1.0 Audio/Video file (all systems info rewritten) with proper clock references.

-ismax

   rewrites the file as an ISMA 1.0 Audio/Video file (all systems info rewritten) with ISMA clock references (streams not explicetly synchronized).
   NOTE: Seeking may be broken with some players (in ISMA, audio and video streams do not depend on main scene clock).

-3gp

   rewrites the file as a 3GP file (no more MPEG-4 Systems specific info). This option is turned on by default when input file extension is .3gp or .3g2.

-cprt string

   adds string copyright notice to file.

-chap chap_file

   adds chapter information contained in chap_file to movie. For more details on chapter file syntax, cf http://gpac.sourceforge.net/auth_mp4box.php.

-rem trackID

   removes given track from file - can be specified multiple times.

-new

   forces creation of a new destination file.

-lang [tkID=]LAN

   sets the language of all tracks or the given track. LAN is the ISO 639-2 3 character code.

-delay [tkID=]delay_ms

   sets the delay in milliseconds of all tracks or the given track. LAN is the ISO 639-2 3 character code.

-split time_in_seconds

   splits in files of desired maximum duration. This will remove all MPEG-4 Systems media.

-splits size_in_kilobytes

   splits in files of desired maximum size. This will remove all MPEG-4 Systems media.

-splitx start:end

   extracts a new file from specified start to end times (in seconds). This will remove all MPEG-4 Systems media. When input file is an ISO-Media file (QT, MP4, 3GP), if no output is specified THE INPUT FILE IS OVERWRITTEN.

HINTING OPTIONS

-hint

   hint the file for RTP/RTSP sessions. Payload type is automatically detected and configured unless forced through one of MPEG-4 Generic RTP payload.

-mtu size

   specifies Maximum Transmission Unit size in bytes (eg maximum RTP packet size). Default size is 1500 bytes (Ethernet MTU). This must be choosen carefully: specifying too large packets will result in undesired packet fragmentation at UDP layer while specifying too small packets will result in RTP header overhead.

-copy

   forces hinted data to be copied to the hint track instead of simply referenced. This speeds up RTP packet construction at the server side but results in much bigger files.

-tight

   performs sample-based interleaving of media tracks and hint tracks. This should reduce disk seeks at server side (depending on server implementation) but results in a bigger file.

-multi [maxptime]

   enables Access Units concatenation in RTP packets if possible. maxptime is optional and specifies the maximum packet duration in milliseconds (default 100).

-rate ck_rate

   specifies the rtp rate in Hz when no default rate for payload. Default value is 90000 (MPEG rtp rates).

-mpeg4

   forces usage of the MPEG-4 generic payload whenever possible. Media tracks without a mapping to MPEG-4 Systems cannot use this.

-latm

   forces usage of the LATM payload for AAC audio.

-static

   enables usage of static RTP payload IDs for streams with official payload IDs. By default MP4Box always uses dynamic payload IDs for maximum interoperability, some players having troubles with static ones.

MPEG-4 Generic Payload Options (Experts only)

-ocr forces all media tracks in the file to be served synchronized. This is needed because most streaming servers don't support desynchronized tracks in a single file. Be extremelly carefull when designing MPEG-4 interactive presentations for streaming since you will have to take care of the streaming server capabilities... MP4Box generates warnings when the file timeline can be ambiguously interpreted by the server. -rap signals Access Units random access flag in RTP packets. This is usually only needed for streaming of MPEG-4 Systems streams. -ts signals Access Units Time Stamps (CTS and DTS) in RTP packets. -size signals Access Units size in RTP packets. -idx signals Access Units indexes (sequence numbers) in RTP packets. -multi enables Access Units concatenation in RTP packets (-ts, -size and -idx are selected if needed). -iod prevents system tracks embedding in IOD (ISMA-like IOD) when generating in SDP. MP4Box automatically detects ambiguous (ISMA/non-ISMA) files but nobody's perfect. This shouldn't be used with -isma option. -sdp_ex string

   adds string to movie SDP or track SDP (tkID:string, where tkID is the OD of the hint track or its media track). This takes care of SDP line reordering, but not of SDP content validity.

-unhint

   removes all hint tracks and other hinting info from the file.