Unable to export time lapse video in GEE because of bit size of satellite imagery

I am trying to create a time lapse video in Google Earth Engine code editor of the Arikaree glacier in CO with the following code:

  .filter(ee.Filter.eq('WRS_PATH', 34))
  .filter(ee.Filter.eq('WRS_ROW', 32))
  .filter(ee.Filter.lt('CLOUD_COVER',25))
  .filterBounds(ee.Geometry.Rectangle(-105.647002, 40.042805, -105.625015, 40.060087))
  .select(['B3', 'B2', 'B1']);
    
var L7coll = ee.ImageCollection('LANDSAT/LE07/C01/T1_SR')
  .filter(ee.Filter.eq('WRS_PATH', 34))
  .filter(ee.Filter.eq('WRS_ROW', 32))
  .filter(ee.Filter.lt('CLOUD_COVER',25))
  .filterBounds(ee.Geometry.Rectangle(-105.647002, 40.042805, -105.625015, 40.060087))
  .select(['B3', 'B2', 'B1'])
  .map(function(image){
  var filled1a = image.focal_mean(2, 'square', 'pixels', 1);
  return filled1a.blend(image);
});
  
var L8coll = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR')
  .filter(ee.Filter.eq('WRS_PATH', 34))
  .filter(ee.Filter.eq('WRS_ROW', 32))
  .filterBounds(ee.Geometry.Rectangle(-105.647002, 40.042805, -105.625015, 40.060087))
  .filter(ee.Filter.lt('CLOUD_COVER',25))
  .map(function(image){
  return image.rename(['B0', 'B1', 'B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B9', 'B10', 'B11']);
  })
  .select(['B3', 'B2', 'B1']);

var collection_merge = ee.ImageCollection(L5coll.merge(L7coll.merge(L8coll)));
print (collection_merge);

var years = ee.List.sequence(1984, 2020);
print (years);

// Export the image, specifying scale and region.
Export.video.toDrive({
  collection: collection_merge,
  description: 'Arikaree3',
  framesPerSecond: 5,
  scale : (0,255 )});

When I try to create the video, I get the error:

"Error: Data type for band [B3] is not supported by video export: Type<Short>. Video export requires 8-bit bands; consider scaling to 0-255 and casting to 'uint8'."

I’m unsure what to do. Any suggestions?

From my research, it seems that Landsat 8 may have a 16-bit band which I think maybe causing the problem, but when I try to run this without the Landsat 8 images I still get the same error.