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Convert mp4 to dvd video movie#
The codec is Mpeg-2.ĭVDs do not use square pixels, the pixels are rectangular: while the movie has a certain resolution the player has to display it as if it were deforming the pixels. The two standards also have different frame ratios. The aspect ratio can be '16/9' or '4/3', the available resolutions change if you are making a PAL or a NTSC DVD. Standard compliant DVD videos have a well-defined and precise video requirement.
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If you are changing the sampling rate and you think the audio quality is poor you can try to add the argument -af resample=48000::2: doing so mplayer will use its most precise algorithm. Using both commands, we will have two files, one per audio track. oac lavc -lavcopts acodec=ac3:abitrate=128 -o italian_audio.ac3 $ mencoder movie.mov -alang it -ovc frameno -of rawaudio -srate 48000 -channels 2 \ oac lavc -lavcopts acodec=ac3:abitrate=384 -o english_audio.ac3 $ mencoder movie.mov -alang en -ovc frameno -of rawaudio -srate 48000 -channels 6 \ Usually ac3 uses 64 or 96 kbps per audio channel. If the audio track it is not an acceptable ac3 file then you have to encode it. $ mencoder movie.mov -alang en -ovc frameno -of rawaudio -oac copy \ If your input file already has an ac3 encoded audio track (with an acceptable bitrate, sample rate and frame rate) you should not encode it again. Selected audio codec: afm: liba52 (AC3-liba52) In order to know your input file audio codec, you can use mplayer, here is an example of a file with a fine audio track:ĪUDIO: 48000 Hz, 6 ch, s16le, 448.0 kbit/9.72% (ratio: 56000->576000) While the heavy constraints of the video makes it almost impossible to find a video track without need of encoding, it is fairly common to find files with an ac3 track. The audio and video total bitrate cannot be greater than 9800 kbps so every audio track reduces the bitrate for the video, but it should not be a problem since a maximum of 8264 kbps (9800 - 1536) of video bitrate is enough. You can have mono, stereo or 5.1 audio tracks. A DVD video can have up to 1536 kbps of audio information, but for each audio track the limit is 448 kbps. The audio tracks are encoded using the Dolby Surround AC-3 Digital codec with a sample rate of 48000Hz. If the disk includes more than one movie, you can select one using the chapter function of the DVD player. We will begin by creating a simpleĭVD that autostarts when put in the DVD player, without any menu. 5.2 Extracting subtitles from another DVDįor this example, every movie on the DVD has one video track, at least one audio track, and possibly includes subtitles.Although not part of the official DVD Video specification, a number of distributors have added copy protection to limit the ease with which a DVD may be ripped and copied. DVDs may also contain chapters which allow the user to easily navigate to a specific point in the video. A DVD may also include subtitles which are stored as bitmap images meaning that any language can be stored as subtitles. The DVD format also supports several types of audio including MP2 and Dolby Digital. At its peak several hundred million DVDs were sold yearly.ĭVD uses a MPEG-1 or MPEG-2 compression, however MPEG-2 supports higher resolution, up to 720x576 pixels. Another threat to the sales of DVDs are the rise of online streaming services such as Netflix which allow a user instant access to video with similar or superior picture quality. DVD is slowly being overtaken by Blu-Ray which provides a further improvement in terms of quality. They quickly overtook VHS to become the most popular format for the distribution of video due to their durability (approximately 100 years) and the superior quality of the image. Released in 1995, DVD is a removable storage device. Detailed information on the MP4 File Format.The only official filename extension for MPEG-4 Part 14 files is. A separate hint track is used to include streaming information in the file. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4.
Convert mp4 to dvd video portable#
Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). MP4 files (MPEG-4 Part 14) are multimedia files.