Method and apparatus for transcoding

An apparatus comprising:

• one or more processors;
• memory;
• a media file acquisition module stored in the memory and executable by the one or more processors to obtain property information of a media file, the property information including an initial resolution of the media file;
• a definition level determination stored in the memory and executable by the one or more processors to determine a first definition level corresponding to the media file based on the initial resolution of the media file, preset definition levels and resolution ranges corresponding to the definition levels, and set the lowest definition level in the preset definition levels as a second definition level corresponding to the media file;
• a resolution determination module stored in the memory and executable by the one or more processors to use the initial resolution of the media file as a first resolution, and determine a second resolution having a same ranking in a resolution range corresponding to the second definition level based on a ranking of the first resolution in a resolution range corresponding to the first definition level;
• a pre-coding rate determination module stored in the memory and executable by the one or more processors to pre-code the media file using a first preset rule to obtain a first pre-coding rate corresponding to the first definition level and a second pre-coding rate corresponding to the second definition level based on the first resolution and the second resolution;
• a resolution adjustment module stored in the memory and executable by the one or more processors to adjust the first resolution corresponding to the first definition level and the second resolution corresponding to the second definition level based on the first pre-coding rate and a preset coding rate threshold if the first pre-coding rate is greater than the preset coding threshold;
• and
• a transcoding module stored in the memory and executable by the one or more processors to transcode the media file using the first preset rule based on the adjusted first resolution and the adjusted second resolution.

One or more computer readable media storing executable instructions that, when executed by one or more processors, cause the one or more processors to perform acts comprising:

• obtaining property information of a media file, the property information including an initial resolution of the media file;
• determining a first definition level corresponding to the media file based on the initial resolution of the media file, preset definition levels and resolution ranges corresponding to the definition levels, and setting the lowest definition level in the preset definition levels as a second definition level corresponding to the media file;
• using the initial resolution of the media file as a first resolution, and determining a second resolution having a same ranking in a resolution range corresponding to the second definition level based on a ranking of the first resolution in a resolution range corresponding to the first definition level;
• pre-coding the media file using a first preset rule to obtain a first pre-coding rate corresponding to the first definition level and a second pre-coding rate corresponding to the second definition level based on the first resolution and the second resolution;
• adjusting the first resolution corresponding to the first definition level and the second resolution corresponding to the second definition level based on the first pre-coding rate and a preset coding rate threshold if the first pre-coding rate is greater than the preset coding threshold;
• and
• transcoding the media file using the first preset rule based on the adjusted first resolution and the adjusted second resolution.