Using SD and HD on Same Timeline
SD and HD refers to the different types of definition. SD stands for standard definition, which is a 16:9 for widescreen and can be transported at all times. Normally multi camera views and additional channels will all be broadcast in SD. The resolution of SD is 576i. High definition is a high picture resolution. A lot of the current broadcast is also done is HD. There are many different picture resolutions for HD: 1080i, 720p and 576p.
Step 1: Determining SD or HD
First, it will be necessary to determine what the best format is for editing, as it will be necessary to set the timeline in SD or HD. Normally, it will be necessary to downgrade the HD to SD. It is best to match the editing format to what the output format should be.
Step 2: SD to HD
If the editing format is to be HD, then it will be necessary to add SD clips to the HD footage. These clips will fit the SD to the 16:9 ratio screen. The HD footage will need to be letterboxed to fit into the 4:3 SD format. This is the best way get the highest format and quality for what you are editing.
Step 3: Combining Footage
Another way to avoid problems when editing both SD and HD formats in 1 timeline is to copy and paste both into a new sequence. Many times, adding the SD to the HD timeline may have problems. This will completely depend on the software. Open each footage in its own format, and then copy and paste them in to a brand new sequence. This is recommended if you are having difficulties.
Step 4: De-Interlacing
Many times, the footage will look odd because the footage has not been de-interlaced. Interlaced lines can be visible for both HD and SD. The deinterlace option should be checked in the properties of the software.
Step 5: Scaling
Scaling can also be used to add HD to an SD timeline. It is typically much easier to edit HD and SD together if they are both done in SD. To get the best quality filming in a higher resolution, than the output ultimately offers the best option. This type of scaling is very flexible and can offer a lot of savings.
Step 6: Pixilation
When going from SD to HD, many times the SD will be pixilated and blurry. At its most basic, think of it as SD footage that is stretched to fit HD. To get around this, it may be necessary to add filters to the SD footage. It may be necessary to use additional software to clean up the SD footage to match the HD footage. A way to get around this resolution issue is to render the footage at maximum quality when exporting the footage. Normally this footage will need to be compressed and then changed to SD as an output, even if the editing is done in HD.
Step 7: Encoding
Once the editing of the different formats have been completed, it is possible to encode this footage in several different forms. Most Avid programs all will have encoding to flash, MPEG-2, MPEG-4 and WMV HD formats.